-------------------------------------------------------------------------
-- ChangeLog
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2.3.100 released September 11, 1999

- bugfix with --analyze --score: analyze the correct move
- make install now copies gnugo.6 to /usr/man/man6
- we do not install mkpat, joseki, mkeyes or sgfgen
- gnugo.6 moved to top directory
- revisions to documentation
- docs/structure.doc is eliminated
- docs/BOUZY renamed MOYO
- patterns/fuseki2.sgf is back in patterns/

2.3.99 released September 10, 1999

- suppression of many messages when running --quiet
- bugfix in fuseki.c which could cause illegal moves

2.3.98 released September 9, 1999

- bugfix in make_worms: typo in adjacent worm code
- bugfix in trymove() and legal(): check ko color
- tuning
- cleaned up malformed entries in patterns.db.

2.3.97 released September 8, 1999

- bugfix in filllib preventing rare illegal moves
- tuning
- minor --help revision

2.3.96 released September 7, 1999

- bugfix in hashing code
- MAX_HANDICAP set to 9

2.3.95 released September 7, 1999

- revision of --help
- revision of documentation
- patch to sgfana.c using multiple character names

2.3.94 released September 3, 1999

- Tuning
- Renumbering and cleanup of patterns.db
- Bug fix in linear_eye_space().
- load_sgf_file() gets the right color to move at end of file
- Various small corrections.
- backfill_depth is now 8

2.3.93 released September 2, 1999

- bugfix in recognize_eye
- bugfix in readlad1: use null pointers in readlad2 call
- fill_liberty() rewritten recursively with backfilling
- atari_save_helper replaced by constraint.
- tuning
- Previous change to moyo_assistance reimplemented correctly
- sethand() places fixed handicap stones as traditional

2.3.92 released September 1, 1999

- Two new eye patterns
- Bug fix in filllib.c, avoiding a possible assertion failure
- Use delta_moyo_simple() in moyo assistance function
- Tuning
- gnugo complains about wrong boardsizes
- avoids some warnings in sgfana.c
- now -o in ascii mode works with handicap stones
- bugfix in readlad2
- bugfix in basicnet3
- docs/OVERVIEW updated

2.3.91 released August 27, 1999

- warnings when compiling with ncurses are hopefully fixed
- The connections code no longer amalgamates attackable worms
- Bug fix in the topological halfeye code. 
- uncovered a problem with halfeyes in the eyes code, documented in a FIXME
- Minor tuning.
- Bug fix in the linear eyes code.
- Random bonus taken into account in the TRACE prints in shapes.
- fill_liberty() completely rewritten
- destroyer taken down

2.3.90 released August 26, 1999

- hey.db removed from distribution
- we no longer give a point for a pass and compel white to pass last
- play_solo.c and genmove.c: calls to snprintf changed to sprintf
- revisions to documentation, and to NEWS, AUTHORS, README, INSTALL
- partial cleanup of main.c
- one new eye pattern
- worm.cut field moved to eye_data structure and initialized properly.
- Added endgame patterns to fix one non-finish bug
- Replaced movenum by move_number() in play_solo.c.
- Removed dead code from dragon.c and liberty.h
- Minor cleanup in worm.c
- One new cut pattern in conn.db
- sente_hane1_helper replaced by constraint
- Bugfix in computation of max weight in mkpat.c
- Tuning

2.3.89 released August 25, 1999

- bugfix in eye_finder
- one new eye pattern
- gaminfo.seed is set
- handicap stones added when not present. 
  (Doesn't work with "-l filename --mode ascii")
- revision to documentation
- message about unimplemented commands removed from ascii help
- One new connection pattern in conn.db.
- Revised connect_under_helper and 
- replaced safe_hane_helper by a constraint
- Revised some joseki values in hoshi.sgf
- Tuning of patterns.db.

2.3.88 released August 23, 1999

- board size bug fix in moyo.c
- fuseki.c: 3-3 invasion deprecated in 9 stone fuseki
- New joseki in hoshi.sgf (tsukenobi variation and one 3-3 invasion)
- tuning

2.3.87 released August 22, 1999

- eye.esize-eye.msize>7 is alive in recognize_eye
- several eye patterns added
- dragon_status: escape_route bound for CRITICAL upped to 6
- -o and --analyzerfile add handicap stones by AB,AW
- in nonfile modes the handicap stones are added in sethand() 
- sethand() checks for max handicap values and returns actually set stones 
- reduced MAX_HANDICAP to 19
- main.c checks for MAX_HANDICAP
- sgf_close_file is called only once, when ending ascii mode with "quit"
- GM property added in --analyzerfile
- HA property added in --analyzerfile (in sethand())
- defined MIN_BOARD 3 in liberty.h
- help output shows MIN_BOARD, MAX_BOARD and MAX_HANDICAP
- cleanup of shapes.c, optics.c and moyo.c

2.3.86 released August 21, 1999

- resolved: hashed functions shall be readlad2 and basicnet3
- connection code patch to reconcile amalgamation and cutstone
  classification (needs rewriting)
- tuning
- amalgamate over _dead_ ko positions
- bugfix in not_lunch_helper
- Changed semantics of play_attack_defend_n()
- unused color parameter removed from get_read_result
- no compiler warnings under GNU/Linux
- man page docs/gnugo.6 added
- convenient tcsh completion described in docs/MISC

2.3.85 released August 20, 1999

- configure option --disable-hashing now functional
- values are not hashed when stackp>depth
- cleanup of mkpat.c
- cleanup of eyes.h
- tuning
- now prints number of eyes in analyzerfile with --analyze eyeinfo

2.3.84 released August 18, 1999

- tuning
- cleanup of dragon.c
- halfeyes.c removed from the distribution
- configure option --disable-hashing sets HASHING to 0
- sgf.c: avoid trying to close output file twice
- eyes.db: code # has been changed to @ to avoid conflict with comments
- Revised compute_eyes() and split off linear eyes to an own function.
- Made return value from recognize_eye() more consistent.
- New autohelper functions to identify eye space points: eye(),
  proper_eye(), and marginal_eye()
- Major revisions of endgame patterns, taking eye space into account
- obsolete functions play_attack_defend2() to play_attack_defend8() removed

2.3.83 released August 15, 1999

- joseki.c upgraded to generate constraints in .db
- 3 new autohelpers in mkpat.c: diff_moyo, area_space, area_stone
- interface/play_test.c: bugfix when --testmode and --analyze are combined
- CHECK_HASHING turned off

2.3.82 released August 14, 1999

- hash codes are now computed incrementally
- bugfix in hash.c
- reading.c: sacrifice only if stackp<backfill_depth to avoid slow reads
- sgf.c and main.c: --decidestring works with small boards
- cleanup of src/attdef.c
- update: doc/MISC
- play_ascii: new commands HELPDEBUG, GOTO, DEFEND, SHOWMOYO, SHOWTERRI, 
  SHOWAREA, SHOWDRAGONS, SAVE, and LISTDRAGONS
- play_ascii: command COMMENT now only writes to analyzerfile
- analyze: new commands AREACOLOR, DEFENSE, MOYOVALUE, TERRICOLOR, TERRITORY, TERRIVALUE
- abortgo saves abortgo.sgf independent of any -o or --analyzerfile

2.3.81 released August 11, 1999

- new function number_weak returns the number of weak groups
- little tuning in hoshi.sgf
- major update of all fuseki.c
- change in --playstyle options, new fuseki become the default
- added stone color NONE in liberty.h for use with set_computer_player()
- new function capture in ascii mode 
- new function last in ascii mode
- bugfix: sethand does not set handicap stones to sgf tree any more
- bugfix: testmode game with --analyze skips variations 
- new sgfana.c with analyze functions and gnugo specific parts of ttsgf.c
- new function sgfTriangle()
- new function sgfMarkWorm()
- bugfix: analyze function recommended switched off as default
- new analyze function capture

2.3.80 released August 10, 1999

- Implement hashing for attack() and find_defense()
- option -H = --hash allows user to specify which functions use hashing
- cleanup of sethand.c
- cleanup of semeai.c
- option --playstyle <style>, replace old --fuseki and --fearless

2.3.79 released August 10, 1999

- hash.h: bugfix which caused reading errors in rr_set_result_ri_rj
- reading.c: savestone2 looks for double ataris to chain when stackp>depth
- updated docs/MISC: analyze functions
- option --analyze works again (was temporarily off by accident)
- option --analyze works in --testmode game, no variations tested
- new analyze functions: moyocolor, recommended, eyeinfo, worminfo
- bug fix in analyze function eyes
- option --score last --analzyerfile saves the potential territory with TW,TB
- option --statistics writes also to analyzerfile
- abortgo() saves analyzerfile 
- ttsgf.c: ttsgf_move_made() removed
- play_solo.c: timing added to benchmark mode

2.3.78 released August 7, 1999

- hashing in basicnet3 and savestone3
- bugfix in play_gmp.c: undo now seems to work!
- sgf/sgf_utils.c: bugfixes in get_moveX and get_moveY
- interface/play_solo.c: bugfix in get_moveXY

2.3.77 released August 5, 1999

- showbord.c: revised behavior of -E option
- minor change in moyo.c to have it reinitialized when a game is reloaded
- change in scoring system for compliancy with chinese & japanese style rules
- ascii mode: save territory points to analyzerfile 
- gmp mode: log game in sgf tree
- gmp mode: undo implemented by replaying sgf tree
- gmp mode: save result and territory points to analyzerfile
- ttsgf.c: new function sgfOverwritePropertyInt()
- ttsgf.c: new function sgfAddStone()
- sethand.c: sets handicap stones to sgf tree
- hash.diff removed from distribution

2.3.76 released August 4, 1999

- interface/html directory contains cgi interface
- bugfix in optics.c: initialization of domains
- bugfix in reading.c: some variations were being overlooked
- hashing implemented in savestone2

2.3.75 released August 2, 1999

- mark illegal moves in --printsgf with IL property
- Some new macros in hash.h
- Use hashing in readlad2 
- Some cleanup of worm.c
- option -f rewritten : opening tuning, including oba moves
- non fuseki part of old -f option became --fearless option

2.3.74 released August 1, 1999

- bugfixes in helpers.c. One of these could cause a crash
- two connection patterns increased substantially
- moved get_komi() and inc_movenumber() to liberty.h
- play_ascii(): new commands to navigate the game tree in ascii mode
- back command (undo) implemented in ascii mode! Newly placed
  stones appear as variations in the sgf
- play_ascii(): changed the compare length of some commands. Now q works
  for quit, b for back and f for forward.
- removed bug in play_ascii(): user pass after computer pass did not
  display result.
- fixed bug in helpanalyzer output
- utils.c: added function intialize board() and removed remove_stone()
- fixed the komi bug reported by Douglas in --analzyerfile

2.3.73 This version may be released later

2.3.72 released July 30, 1999

- bugfix in updateboard ko handling
- Moved obsolete documentation about reading.c to doc about utils.c
- Expanded documentation about reading with hashing
- minor tuning

2.3.71 released July 29, 1999

- bugfix in make_worms: moving point of defense
- fixes to handling of ko after a pass
- updatepassmove() removed
- updateboard now handles pass moves.
- KO handling by trymove is currently broke
- play_ascii.c, play_gmp.c, play_solo.c updated accordingly.
- revisions to ascii interface.
- legal() now reports a pass move to be legal.
- revision of one eye pattern
- tuning to increase attention to connections
- 2 new helpers
- mkpat: weak autohelper option needed ==CRITICAL
- modified worm values

2.3.70 released July 28, 1999

- Zobrist hashing implemented
- new files src/hash.h and src/hash.c
- readlad1 uses hashing
- readlad2 does consider 2 stone sacrifices if stackp<backfill_depth
- revised method of ko detection using
- New file docs/HALFEYES describing the topology of false eyes and half eyes.
- Halfeye detection rewritten from scratch according to docs/HALFEYES.
- Revisions to connection code.
- A small amount of tuning.
- Dragon values changed when worm values are.
- Designation of marginal eye spaces revised to consider if enemy has a safe move
- Bugfix in worm.c

2.3.69 released July 27, 1999

- bug fix in connections.c
- two false eye patterns added
- one pattern added
- readlad2 sorts liberties before plunging in to the read
- readlad2 rejects sacrifices of more than one stone
- bugfix in shapes.c
- in worm.c we sometimes try point of attack for defense
- removed the -b bug 
- removed some warnings
- ascii mode: new command comment writes one line comments to file
- ascii mode: new command score displays terri_eval
- ascii mode: new command dead  shows dead stones as lower letters
- ascii mode: at end shows dead dragons, lets user toggle their state
- ascii mode: REsult propterty is written to analyzerfile
- new command line option helpanalyze
- option --score end outputs territory points (TW,TB) to analyzerfile
- utils.c: new function remove_stone
- utils.c: new function change_dragon_status
- main.c:  added shortcut for --help to the help message
- ttsgf.c: reduced the memory consumption of the sgf structure
- liberty.h: made the dragon structure public

2.3.68 released July 26, 1999

- Tuning, seki patterns.
- New connection patterns.
- Revision of connections code.
- New helpers.
- eye_finder() now considers shape's move as defender() and attacker() do
- Cleaning up and bug fixes in attdef.c.
- More debug messages for the eyes code.
- Bug fixes in compute_eyes() and play_attack_defend_n().
- Bug fix in shapes.c: TRACE was missing an argument
- fixed testwind compiler warning

2.3.67 released July 25, 1999

- bugfix in attacker: depth was changing each move
- A class patterns, analogous to the D class, implemented but not tested
- B and C classes can now be used in the same pattern.
- The meta_connect bonus now specified with a new field
- doc/PATTERNS revised
- the oplay_attack() and similar autohelper functions documented
- meta_connect bonus removed from most patterns except block/expand
- Weakness bonuses are now applied at a later time than they were.
  Thus B and C patterns are treated the same as patterns using helpers
- A 5,5 weakness bonus added to all cut/connect patterns 
- diag_miai2 helper revised.
- Some tuning.
- shapes.c cleaned up.
- revisions in interface/play_ascii.c
- substantial revision in sgf/ttsgf.c
- new option --analyzerfile (see docs/MISC)
- docs/SCORING is renamed docs/MISC

2.3.66 released July 23, 1999

- make_worms: bugfix in resetting of worm.attack and worm.defend 
- bugfix in does_defend
- new autohelper macros
- play_attack_defend_n can take an arbitrary number of parameters
- function who_win renamed who_wins for grammatical reasons
- play_gmp.c: if there is a handicap we assume komi=0.5
- play_solo.c: captures not added a second time
- new patterns in eyes.db
- some tuning
- sgf.c: pass is [tt] unless board_size>19
- depth and backfill_depth are augmented in attacker() and defender()
- bugfix in printsgf mode
- sgf_printboard prints current board position to sgf file
- LOAD_AND_PRINT mode: read file, output final position

2.3.65 released July 21, 1999

- dragon_eye does not amalgamate across an ikken tobi
- play_ascii.c: change depth on the fly
- new option --statistics
- revision of various helpers and 2 new helpers
- mkpat rewritten so constraints can now be on several lines.
- New autohelper functions xplay_attack, oplay_attack, xplay_defend,
  and oplay_defend, which take variable number of arguments.
- New functions in utils.c to support the above.
- tuning
- bugfix in sethand.c
- increased DEPTH to 14 and BACKFILL_DEPTH to 7
- change_attack can sometimes reclassify dragons as DEAD
- command line resetting of depth

2.3.64 released July 20, 1999

- reformatting of reading.c
- bugfix in break_chain2
- revised basicnet3: try harder to rescue boundary chains
- revised basicnet3: remember moves tried to avoid redundant reading
- bugfix in find_lunch: pick juciest worm
- sgf property PL implemented in play_solo
- revisions in play_solo.c and fuseki.c for small boards

2.3.63 released July 19, 1999

- delta_moyo, delta_terri work with either color
- 2 new functions diff_terri and diff_moyo, 
- cleanup of moyo.c
- -f option revised
- docs/BOUZY revised
- new docs/SCORING
- New autohelper functions.
- New connection patterns and revisions of the connections matching code.
- Bugfix to an eye pattern.
- Much tuning.
- Revised criterion for when to defend or attack a worm.
- Extended the scope of destroyer().
- Experimental worm and cut revaluation in light of dragon formations
- Changed heuristics for eye values of non-matched eye shapes.
- reordered arguments to does_attack() and does_defend()
- bugfix in readlad2: backfill was turned off
- default backfill_depth is now 5
- -l and -o options can be - for stdin and stdout

2.3.62 released July 17, 1999

- New autohelper functions, xlib(), olib(), xcut(), and ocut().
- Revised documentation for autohelper functions.
- Connections database introduced. New files: connections.c and conn.db.
- find_dragon_pairs() disabled, replaced by connection patterns.
- Cutting patterns from the connection database can modify eye spaces.
- Amalgamation in dragon_eye() no longer done over marginal eyes.
- mkpat partially rewritten.
- Minor correction to eyes.db.
- Nakade helpers cleaned away.
- Minor tuning,
- two more nakade like patterns removed, EC63 again C   pattern.
- Bug fix in attacker(): discount bad captures, not good ones
- New function destroyer() to capture of strings that can't currently
  be defended, but which could be after opponent backfilling
- Some cleaning in genmove.c.
- Attack points of non-defendable strings not moved in make_worms
- defense points added for adjacent non-defendable strings so
  dragon amalgamation won't confuse semeai()
- new function read_sgf_header used by load_and_analyse_sgf_file
- new function load_and_score_sgf_file
- new option --score and new mode LOAD_AND_SCORE
- new function evaluate_territory

2.3.61 released July 15, 1999

- nakade patterns are gone
- only linear patterns are currently hand-coded
- many new eye patterns
- not_lunch_helper aids in hane/kill combinations
- undid a change in 2.3.59: amalgamation on first line

2.3.60 released July 15, 1999

- TODO revised
- copyright revised in interface/ files
- new pattern in eyes.db
- halfeyes: require O not dead
- revision of detect_trap_helper
- revision of one pattern in hey.db
- new ko patterns
- other minor changes
- new functions does_attack and does_defend in utils.c
- attacker and defender call these functions
- copyright notice slightly changed in main.c
- reformatting of worm.c
- unwanted handicap printf removed from play_gmp.c

2.3.59 released July 14, 1999

- revision of docs/DRAGON
- several new eye patterns
- fair amount of tuning. Particularly, changes to diag_miai patterns
- dragon.c: we don't amalgamate a dragon if it touches the eyeshape
  only on the first line
- COLOR_STACK_SIZE increased to 70
- DEBUG used in optics.c

2.3.58 released July 13, 1999

- mkpat revised. Autohelper functions now can take multiple parameters.
  First out is defend_against(a,b) which plays our own stone at a and
  then checks whether the opponent can safely play at b.
- some tuning of patterns.
- new function defend_against() in utils.c
- bugfix in compute_eyes(): missing returns
- two new eye patterns
- bugfix in add_half_eye
- more refined testing of att_X case in halfeyes.c
- halfeye: obsolete test that eye and halfeye are in distinct cavities omitted
- halfeye: we check that * is a safe move for X
- restored marginal test in throw_in_atari_helper (removed in 2.3.55)
- superceded docs/GRAPHS removed from distribution
- filllib.c reformatted

2.3.57 released July 12, 1999

- count and chain rewritten for speed
- more graceful error message if no in file specified in testmode
- eye pattern 10 needed a vital point
- find_lunch and make_worms: a ko is not lunch

2.3.56 released July 11, 1999

- add_half_eye: when a half eye's vital point is in another eyeshape 
  the eyeshapes are amalgamated. This is correct and stops some crashes
- computer tries to compute the score at end of game
- new function who_win in moyo.c
- one chimera pattern included in eyes.db
- bugfix in attdef.c: color in territory test
- bugfix in showbord.c: display of capture count

2.3.55 released July 9, 1999

- integration of half eye and eye code
- separate eye domains for black and white
- revision of docs/EYES to document the algorithm
- a couple of changes that will be undone in a later release:
  temporary oversimplification of treatment of att_X in hey_callback
  temporary oversimplification of throw_in_atari_helper
- removal of one half eye pattern
- experimental penalty for running inside enemy territory
- bug fix in semeai.c
- revision in showboard for -E option

2.3.53 released July 8, 1999

- reading.c: new function special_rescue finds certain saving moves
- revisions to savestone2 including use of special_rescue
- speedup in find_lunch
- minor revisions to hey.db and eyes.db
- bugfix in mkpat (this could cause compilation failure)
- bug fix in make_dragons (ignore eyes when not relevant)

2.3.52 released July 7, 1999

- bugfix in setup_double_atari_helper (could cause crash)
- minor tuning
- revision make_domains: influence can't creep under third line stone
- revision to find_lunch: if already eaten it's not lunch
- revision in halfeyes.c vis a vis Pattern 12

2.3.51 released July 6, 1999

- revision of mkeyes
- new function recognize_eye() for use by the reading code (unfinished)
- revision of the -f option (move generator based on territory)
- cleanup in helpers.c and replacement of helpers by constraints

2.3.50 released July 4, 1999

- gnugo -f implements search for big moves with delta_moyo>=12 
- and delta_terri >=14. Such a move gets value 80. 
- tuning
- some work on false eye code
- some work on the eye code
- bugfix in double_atari_helper

2.3.49 released July 2, 1999

- Correction to sgf output from ascii interface.
- Results of safe_move() are cached if stackp==0.
- Helpers and some other code rewritten to use safe_move() 
- Bugfixes in  block_attack_defend_helper and urgent_connect_helper
- Reading bug fixed in savestone2().
- tuning
- autohelper options safe_xmove,safe_omove,xmoyo,omoyo,xarea,oarea,xterri,oterri
- new function mkeyes to compile the eye database (unfinished)
- docs/GRAPHS explains the approach to the eye code
- revisions to eyes.db and eyes.h
- in halfeyes.c we make an exception to the rule that X can't be captured
- revisions to hey.db
- dragons with one eye and lunch are CRITICAL
- revisions to eye_finder to find such dragons
- eyespaces are not connected through adjacent marginal eyes
- various fields initialized in make_domains()
- bugfixes in make_domains
- bugfix in compute_eyes: sometimes found the wrong end of a linear space

2.3.48 released June 29, 1999

- experimental changes to fuseki.c
- revisions to helpers and patterns
- eye_finder() now calls sgf_move_considered()
- revisions to compute_eyes: eye shapes of size 4
- DEPTH is now 13, BACKFILL_DEPTH is 9
- gnugo --help now prints defaults of depth and backfill_depth
- bugfix in worm.c: some non-kos were incorrectly identified as ko

2.3.47 released June 29, 1999

- substantial speedup in chainlinks
- minor tuning

2.3.46 release June 28, 1999

- tuning, new helpers and patterns
- some half eye code restored to dragon.c
- some further linear patterns in compute_eyes()
- bugfix in savestone3
- speedup in find_lunch: if stackp==0, we used cached info
- in break_chain2 don't try certain foolish moves
- speedup in basicnet3 (avoid unnecessary readlad1)

2.3.45 released June 27, 1999

- 3 new functions delta_terri_color, delta_moyo_color, delta_area_color
- new board stack in moyo.c
- BOUZY updated
- bug fixes regarding half eyes in dragon.c and eyes.c
- new code for some linear patterns
- bugfix: dragons around a ko were getting amalgamated

2.3.44 released June 25, 1999

- bugfix in atari_save_helper (could cause crash)
- revision to CD68 (could cause GNU to play out a ladder)
- bugfix in dragon.c: incrementing msize wrongly
- minor revisions to make_domains()
- new functions int moyo_color(int m,int n) and int terri_color(int m,int n)
  returning the color of the intersection as seen by terri & moyo modules
- new function delta_moyo_simple() without meta_connect bonus, delta_moyo()
  is now a wrapper to this one (should be a transparent modification)
- diag_miai_helper uses the new moyo_color()

2.3.43 released June 24, 1999

- revisions to ascii interface
- gnugo can resume adjourned games
- gnugo plays through endgame phase of the ascii interface
- much tuning
- revisions to helpers and new helpers
- in this version a weak group has between 0 and 20 points space
- two half eye patterns are back. Half eyes still not working right
- (incomplete) revision of eye code to deal with half eyes
- bug fix in eyes.c regarding opponent stones within eyespace
- tinkering with hoshi.sgf


2.3.42 released June 23, 1999

- weak groups now have between 4 and 20 liberties
- diag_miai_helper won't recommend a move in opponent's territory
- revisions to patterns/hoshi.sgf
- mkpat.c: fields in NULL pattern at end of patterns.c corrected
- mkpat.c: weak option added to pattern compiler
- some tuning
- dragon.c: error eye.msize was preventing us from finding false eyes
- some code moved from eye.c to dragon.c to help finding false eyes
- compute_eyes and propogate_eyes are now public functions
- bugfix in shapes.c: obonus and xbonus should now work correctly
- revisions to documentation

2.3.41 released June 22, 1999

- compute_eyes is partially written (without using matchpat)
- revisions to computation of genus
- openeyes is expunged
- half eye database is invoked earlier
- half eye database used only to find false eyes
- bonus field split into obonus and xbonus
- obonus and xbonus are applied to patterns involving weak groups
- most EB patterns now have bonuses
- 5 point bonus for patterns involving weak groups (2.3.38) is gone
- some tuning
- some bugfixes in eyes.c, dragons.c and semeai.c

2.3.40 released June 21, 1999

- substantial revisions and new code in dragon.c and eye.c
- dragons around an eye shape are now amalgamated
- delta_moyo looks in meta_connect for the tested move
- Bug fixes for two helpers.
- Minor tuning.
- GNU now can read sgf files with missing final ")".
- defender and the attacker try the move suggested by shapes()
- The semeai player now prefers to play on mutual liberties if this
  improves the liberty balance.

2.3.39 released June 18, 1999

- some tuning, new helper block_attack_defend_helper
- eye code now fills out an array eye[][] with data
- revision to eye algorithm
- open eye spaces now have origins
- bugfix with -E option
- dead groups are now cyan in showboard (were white)

2.3.38 released June 17, 1999

- experimental bonus of 5 points to patterns involving a weak dragon
- revision of patterns/hoshi.sgf: attachment variations deprecated
- open eye shapes are now computed. Display these with gnugo -E
- some tuning

2.3.37 released June 16, 1999

- weak groups no longer classed dragon.status==CRITICAL. Instead ...
- new field dragon.weak
- old worm.weak and dragon.weak renamed worm.lunch and dragon.lunch
- weak groups (found by moyo) classed dragon.weak==CRITICAL
- dragon.weak field not used by genmove but displayed by showboard
- new helper wedge2_helper
- tuning and other revisions to pattern database
- src/eye.c code is now linked though not used by genmove
- revisions to showboard to display eye domains if xo=1
- int make_worms() (was void) returns 1 if board not empty
- find_weak() renamed find_lunch()

2.3.36 released June 15, 1999

- weak groups are classed CRITICAL so they scrounge eyes
- new function test_weak to find weak groups (in moyo.c)
- revision to print_txt_color
- bugfix in fill_liberties
- revised docs/BOUZY
- bugfix: find_defense no longer checks that strings can be attacked
  which required some modifications, slowing us down a little
- DEPTH reduced to 12

2.3.35 released June 15, 1999

- reading code is much faster now and hopefully also more accuracy. 
- new function relative_break_chain() used in revised readlad2()
- caching of moves eschewed in break_chain(), break_chain2() 
  if return pointer is NULL
- DEPTH increased from 10 to 13
- new docs/READING explains using --decidestring -o with gdb
- connect_under_helper() rewritten to use connection_value()
- housecleaning in patterns.db

2.3.34 released June 14, 1999

- test for pass in play_solo.c corrected
- tuning
- new pattern classification: Edge Expansion
- GNU tries in two ways to fill liberties (points in Chinese count)
- before passing, DEAD opponent stones in semeai are reclassed
  unknown, then shapes is rerun
- if that doesn't work, new function fill_liberty() tries again
- new field dragon.semeai, new function revise_semeai()
- static_eval() is gone (superceded by moyo())
- reading.c: new function savestone3()
- reading.c: savestone2 no longer tries to find the best move since
  we have ways to improve points of attack and defense
- some code taken out of find_defense()
- dump_stack() uses gprintf instead of TRACE and counts variation

2.3.33 released June 12, 1999

- new function meta_connect to test a move against area ownership 
  (returns true when the move connects/disconnects meta groups)
- area ownership now sees kosumi connections
- minor changes in moyo.c data structures
- in shape.c, added some bonus for meta_connect moves
- in mkpat.c, some bonus added to maxwt for meta_connect moves
- minor tuning
- in readlad2() we consider throwins
- Copyright updated (no longer says 2.0) in src/ and patterns/

2.3.32 released June 11, 1999

- substantial speedup of reading code
- in savestone2, we try to find an easy saving move before reading
- in savestone2, we don't try second move if first works
- in readlad2, we postpone break_chain2 but not break_chain
- option --decidestring -o now outputs variation numbers
- bugfix in extend_to_kill_helper
- embryonic src/eyes.c included in tar file

2.3.31 released June 10, 1999

- new globals last_move_i and last_move_j give the last move made. 
  This is used to improve(?) ascii output.
- fixed bug ascii play where the captured stones where added wrong
- play_ascii and play_test start with move 0 like play_gmp
- in ascii play the last move is now marked
- bug fixed in ascii play when a pass is made
	
2.3.30 released June 9, 1999

- reimplementation of of handicap in ascii without writing p[][]
- new functions for saving/restoring game state without using stack
- use inc_movenum instead of movenum++ in play_gmp and play_solo
- revision to ko_important_helper: ko values cut in half
- move_attack() and move_defense() renamed change_attack() and change_defense()
- new komoku pattern
- 2 new patterns

2.3.29 released June 7, 1999

- connection_value moved to src/util.c
- alive11_helper modified
- eschewing of kos by attacker() and defender(), dropped in 2.3.28 is back
- edge_ko_important helper added
- new sente_extend_helper, straight_connect_helper, block_to_kill_helper
  extend_to_kill_helper, revise_value_helper
- new half eye pattern
- several new patterns and changes to patterns.db
- moved some CC patterns from wrong section
- now --color should work with ascii interface

2.3.28 released June 6, 1999

- bugfix (worm.c, shapes.c, helpers.c): propogate_worm not used with stackp>0
- attacker() and defender() no longer eschew kos
- unused sgfAddPlay is commented out (fixing a warning)
- fixes to trace (indent is back, caves which are kos are reported correctly)
- default backfill_depth is 7 (arrived at by trial and error)
- option --decidestring no longer requires -o (useful with or without it)
- in make_worms() code to improve worm.attack, worm.defend we now read
  one step deeper in the stack to avoid horizon effect
- initialization in propogate_worm() uses memset

2.3.27 released June 5, 1999

- new option -B [depth] should now work
- default values of depth and backfill_depth are 10 and 5
- new function mprintf which is similar to gprintf but writes to stdout
- changed vgprintf to work with different outputs (i.e. stderr, stdout)
- the testmode now write its output to stdout only (never stderr)
- bugfix in backfire_helper

2.3.26 released June 4, 1999

- Backfill depth can now be set with -B [depth]
- very minor revisions to patterns.db
- reading.c: bc was not being initialized when stackp>0 (twice)

2.3.25 released June 1, 1999

- bug fix in new make_worm() code
- connection_value gives a bonus if the connecting move makes 2 eyes
- mystery pattern CB102 removed

2.3.24 released May 30, 1999

- tuning of joseki and patterns
- revised definition of inessential worms --- require worm.weak==-1
- new code in make_worms() to revise points of attack/defense
- BACKFILL_DEPTH reduced to 4 due to increased slowness
- basicnet4 included but turned off

2.3.23 released May 29, 1999

- asymmetry bug in moyo.c fixed: when init_moyo() is launched,
  boardsize is not known
- area computation and dilat algorithm bug
- distribution includes reading.c.alt for the experimentally inclined
- tuning and new helpers
- dragon.c split into dragon.c and worm.c

2.3.22 released May 27, 1999

- disabled long jumps into enemy area without a secure connection
- no center pattern can jump down to or along the second line
- revision to the endgame patterns according to docs/ENDGAME
- detect_trap_helper looks for moves attacking two groups at once
- some other tuning
- evaluate_game removed from the distribution
- semeai will not recommend a move which leads to an immediate loss
- bugfix in semeai: bestlib was not getting updated

2.3.21 released May 27, 1999

- Empty corner play moved to src/fuseki.c (new) and reimplemented
- Embryos for 3-4, 3-3, 5-3, and 5-4 joseki databases in patterns/*.sgf
- option -m [level] for debugging moyos
- docs/EYES revised
- bugfix in urgent_connect_helper
- pattern revisions

2.3.20 released May 26, 1999

- readlad2 now tries backfilling. readlad2 and attack return 2 if
  a backfill is found but no direct attacking move
- new patterns
- use of macros to simplify helpers
- trymove: sgf --decidestring now gives more information
- solves errors when MAX_DILAT != MOY_DILAT
- now the area ownership uses 4 dilation, which seems better.
- docs/ENDGAME added from Gunnar's email of May 18, 1999

2.3.19 released May 24, 1999

- edge block/expand patterns reordered
- tuning
- a new joseki
- a new helper
- Move evaluate_game functionality into play_test.c
- It is now main.c that loads the sgf file into a tree.
- If no playmode / testmode is supplied, look for a comment
  of the form  C[testmode=...] in the root node. If found,
  this sets the playmode / testmode.
- Other interface fns take the tree, rather than filename, as param.
- testmode is now a local variable, passed as param into play_test,
  rather than setting into global state via set_testmode / get_testmode
- Move the tests for acceptable sgf file (GM[1]FF[3/4]) into the
  sgf reader, rather than in the user of the tree.
- bugfix in hane_backfill_helper
- semeai now attacks dragons of low vitality
- semeai tries a little harder to choose a smart liberty

2.3.18 released May 23, 1999

- break_chain() and break_chain2() return 2 if saving move can be taken
- savestone2() and find_defense() try harder not to make self-atari
- find_defense() now considers tenuki
- forgot to initialize adjsize and adjlib in chainlinks()

2.3.17 released May 23, 1999

- Complete reordering and some tuning of the fuseki patterns.
- A little tuning elsewhere.
- Documentation of the new features in the patterns.db format.
- The -m option enhanced with another board with delta_moyo values.
- chainlinks test now in basicnet3
- delta_terri(int ti, int tj,int color) : the same as delta_moyo(),
  but against the 5/21 evaluation
- area ownership evaluation (using 5/0 algo), with wrapper functions :
  area_stone(int m,int n), area_space(int m,int n)
  area_color(int m,int n), area_tag(int m,int n)
  set_area_tag(int m,int n,int tag)
- the values are computed during make_moyo evaluation, use
  "gnugo -m" to see how area are evaluated.
- bugfix in play_test.c

2.3.16 released May 22, 1999

- Wind assistance complemented by moyo assistance.
- Move dependent randomness replaced by pattern dependent randomness.
- Format of patterns.db changed to accomodate new features mentioned above.
- One new joseki line.
- Jump out patterns retuned. They may still be somewhat out of tune
  but in a new and different way. Or maybe they even work quite well.
- Some tuning of fuseki patterns.
- Caching of upower and mypower values from testwind.
- Some functions moved from matchpat.c to shapes.c.

2.3.15 released May 22, 1999

- board-setup nodes were being ignored in test-mode
- fixes a bug where moves annotated as bad (MA[]) were reported as good.
- took ascii_showboard out of play_test.c.
- end_sgfdump() tries to pop the stack before closing the file
- DEPTH ramped all the way up to 10, the new reading code is so fast
- evaluation of moves is moved to break_chain and break_chain2
- simplification of readlad1, readlad2, savestone2, find_defense and basicnet3
- a few annotated games against David Fotland's XGO added to regression/

2.3.14 released May 21, 1999

- documentational changes to helpers.c
- minor changes in patterns.db
- all jump_out_helper patterns changed to weight 60 for moyo heuristics
- jump_out_helper() modified to use moyo heuristics
- new function delta_moyo() run quite fastly, using the cache as proposed.
  the result of this function go in global variables :
  moyo_test[WHITE],moyo_test[BLACK] and the difference from precedent
  moyo evaluation is in moyo_test[0]
  delta_moyo returns what is expected : the difference from point of view
  of "color" player, aka moyo_test[0]
  the same for moyo_eval[3] and terri_eval[3]
  so all the results are availables for later use. 
  (see sources for details)
- used #defines for the variables 5/21 and 5/10 (can be 4/10 too), see liberty.h


2.3.13 released May 20, 1999

- further revisions to ttsgf_read.c regarding file buffering
- tuning, new patterns, helpers, half eye patterns

2.3.12 released May 20, 1999

- tuning
- ttsgf_read.c: changed 

2.3.11 released May 19, 1999

- reading.c from 2.3.8 is restored
- MAX_FILE_BUFFER increased to 150000 in ttsgf_read.c
- tuning and a new joseki
- hide most of liberty.h from non-src/ code.
- src/ and patterns/ define BUILDING_GNUGO_ENGINE,
  and are therefore allowed to see all the internal
  symbols. Otherwise, code just sees a few functions,
  and sees 'const' versions of the variables.
- (liberty.h defines a macro PUBLIC_VARIABLE which expands
  to  extern  for engine source files, and extern const
  for others)
- *NOTE* : we get many warnings about const violations,
  where other modules write to these variables. In particular,
  ascii_showboard makes temporary changes to p[][].
  But it still compiles (with gcc at least). These interface 
  violations were always there. Now they are visible.
- Moved remove_string() and count_territory() from play_ascii
  into src/utils : these need to be part of the engine
  since they have intimate access to the state.
- Did a bit of gratuitous changes with play_test.c
  No functionality changes.
- lost get_*_a and put_*_a interface functions.
- make_dragons() is no longer predicated on movenum, but 
  on existence of worms.
- potential_moves[][] is now taken seriously : genmove()
  clears it at the start of the move cycle, rather than
  having sgf_move_made() clear it at some random time
  after genmove has returned.
- semeai criterion slightly changed: my dragon.vitality<0
  and your dragon.status==DEAD.

2.3.10 released May 18, 1999

- hane_backfill_helper deprecated
- semeai module now consults vitality field to initiate fighting
- test mode did not pass movenum to engine code: fixed.
  did away with the game_info entries for boardsize and move_number, 
  made the interface use the engine's global variables instead.
  Better solution is needed (see TODO)

2.3.9 released May 17, 1999

- play_solo.c: in load_sgf_file() we now use global movenum instead of mv
- play_solo.c: white stones were loading as black (fixed)
- new helpers, tuning, revisions to pattern database
- mkpat.c: maxwt now takes bonus into account
- reading.c: break_chain2 simplified

2.3.8 released May 17, 1999

- backfill.sgf added to regression/
- color added to moyo.c
- bugfix in moyo.c: captures were counted backwards
- BOUZY added to docs/
- bugfix in sente_hane_helper
- joseki patterns are now type 's'
- fix the board_size bug in test mode
- reimplement load_sgf_file() in terms of the sgf parser : gives us
  ability to read multiple AB[][]... for free
- move load_sgf_file and load_and_analyse_sgf_file from sgf/ into
  interface.  (Currently play_solo.c but that's temporary.)
  Justification is that these fns have more to do with the engine
  than with sgf files.
- put in the emacs variable blocks into some of the files
- remove some extern refs from .c files - according to David 
  this is a bad practise
- Remove a few remaining // comments, and disable // comments in 
   GNUGO_SOME_WARNINGS
- Reorganise the --help page, and add long options for most of the 
   short ones. The --help is modelled after gnu tar.
- Some files had #define _NO_PROTO to hide getopt() prototype, but 
   these files were not doing option parsing, so  assume this is redundant.
- interface game_info structure was used only in interface.c, so
   moved the structure defn out of a public header file
- The ttsgf_read.c code only offered to parse an sgf file which had 
   already been read into a buffer. Moved a code fragment which appeared 
   in two places to load the file then parse it into a readsgffile() 
   function.
- Prefixed all the symbols for long option names with OPT_, and mode 
   names with MODE_to avoid namespace clashes. (DECIDE_STRING was being 
   used as a mode and an option.)

2.3.7 released May 15, 1999

- Jerome's moyo mode (-m option)
- new patterns and helpers, including backfill patterns CD47 and CD48
- reading.c: trysafe in readlad2 has been removed
- reading.c: in savestone2 if stackp==0 we first try to capture
-  a surrounding string. This would lead to thrashing if we tried
-  it at deeper levels
- reading.c: bug fix in find_defense (Gunnar)
- reading.c: in break_chain2 we omit harder attacks if string has
-  3 liberties since this causes too many errors.
- reading.c: in basicnet3 we test a little more the attack really works

2.3.6 released May 15, 1999

- bug fixes in patterns/

2.3.5 released May 14, 1999

- tuning, new helper
- initialization in src/evaluate_game.c and interface/play_test.c

2.3.4 released May 13, 1999

- Nils' changes to main.c and src/Makefile.am
- tuning, joseki revisions, new helper wedge_helper

2.3.3 released May 12, 1999

- find_weak eschewed in find_defense
- change to allow build in a directory other than source
- braces to joseki.c to avoid a warning about dangling else
- added --testmode game to analyze games and see if it considered the moves
- added docs/structure.doc describing program structure and APIs

2.3.2 released May 12, 1999

- missing library files restored in utils/Makefile.am
- tuning, invasion under hoshi joseki
- and a cosmetic bug fix in shapes.c.
- patterns for endgame ko
- bugfix in double_attack patterns

2.3.1 released May 11, 1999

- Joseki compiler and beginnings of a Joseki database
- some tuning
- Tweak sgf/Makefile.am to write generated sgf_properties to $(srcdir)/
    note : this generates a warning at automake, but I think it is benign.
- remove the GCC_OPTS from the Makefile.am's, and replace with either
    @GNUGO_SOME_WARNINGS@ or @GNUGO_ALL_WARNINGS@.
    This means we can centralise the choice of which warnings we enable,
    rather than having to duplicate the list of warnings in each component.
- Add code to configure.in to generate the above.  ALL_WARNINGS switches off use
    of // comments  (via -Wp,-lang-c89 which runs preprocesser in ansi mode).
    SOME_WARNINGS will do the same once all components have been cleaned up.
    SOME_WARNINGS is intended for code over which we don't have full control (eg gmp.c)
    and so we have to be more liberal in the diagnostics.
- Removed from the build some of the stuff in utils/ which we do not (currently) use.
- fixed clear_board() bug that caused segfaults
- fixed game parameter handling in main() to use interface API
- updated other interfaces to partially use interface API (no more
   passing from main!)
- removed // comments where they were not needed
   They stil are in the tt* code, that needs to be revisited!!
- patched sgfgen to use stdin and stdout- makes things easier

2.1.25 released May 10, 1999

- added --decidestring option for sgf debugging reading code
- added regression directory: contains a few example test files
- added --quiet option
- added --testmode option: move, annotation, or both
   This allows some flexibility in handling differently annotated files
- added --infile and --outfile options
- wrote play_test to handle regression testing
- wrote sgfgen, a program to translate SGF definitions into a header file
- added Tommy Thorn's code for SGF parsing and implemented tree parsing
- updated ASCII interface to rely on interface routines- it works!
- updated interfaces to handle new 'pass' based on int returned from genmove
- made genmove return boardsize, boardsize coordinates for pass 
- added interface specification and code-- we now have engine independence!
- moved all SGF code into sgf directory

2.1.23 released May 7, 1999

- sgf debugging of reading code (from gdb only in this release)

2.1.22 released May 6, 1999

- renum target removed from pattern Makefile.am and Makefile.in
- strategic_distance was being calculated incorrectly
- revisions to pattern database
- chainlinks now tabulates the size of adjacent worms in preparation
     to trying to sorting them when stackp<depth
- split out play_solo() into play_solo.c
- moved interface routines (play*, gmp*, sgf*) into interfaces/ directory
- combined play*.h into interface.h
- renamed 'lib' directory to 'utils' to be consistent with other dir names
- moved AUTOMAKE.README into docs

2.1.21 released May 5, 1999

- minor revisions to pattern database
- adds tests for term.h and curses.h before defing CURSES
- fixes a typo in helpers.c
- fixes some hard-wired 18's in make_worms()
- fixes what I believe to be a bug in scoping in make_worms
- gratuitously moves some variable declarations around in make_worms
- moved pattern files to patterns directory
- pattern files and functions are now linked in as a library: libpatterns

2.1.20 released May 5, 1999

- configure options
- main.c: LOAD_AND_ANALYZE mode

2.1.19 released May 4, 1999

- removed #include "../lib/getopt.h" from play_ascii.c - not needed
- added some code to better handle config.h to main.c and play_ascii.c
- added ascii_showboard() before the counting starts, useful after 'play 999'
- added --mode option to main.c
- changed how different play modes are started: now using switch()
- removed -g option: use --mode instead
- changed MAX_BOARD to 25 in liberty.h: try some bigger games!
- changed sgf 'pass' to [tt] if boardsize>19, else [] (by SGF standard)
- changed 'pass' moves to send board_size, board_size to sgf routines

2.1.18 released May 3, 1999

- play_ascii: playblack and playwhite are recognized as valid commands.
- play_ascii: Correct use of strtok on Solaris (missing strsep)
- ascii display and showboard now work as stated in the help command
- ascii display doesn't draw the board twice if showboard is enabled.
- ascii force was broken, is no longer.
- added check for getopt.h to configure.in
- fixed PLAY in play_ascii: need to check for two passes!
- prettyfication in main.c: changed strcmp() usage
- fixed seed printing in sgf.c
- play_gmp: handicap was not being passed to sgf_write_game_info

2.1.17 released May 2, 1999

- added counting to ascii interface
- Gunnar's reshuffled patterns
- LDFLAGS = $(COLORLIB) in src/Makefile.am and src/Makefile.in

2.1.16 released May 1, 1999

- further revisions to ascii interface

2.1.15 released May 1, 1999

- further revisions to play_ascii and sgf.c
- Gunnar's pattern classification in patterns.db
- static evaluation of the board position

2.1.13 released April 30, 1999

- moved all sgf routines into sgf.c
- changed pass value: from 19, 19 --> board_size, board_size
- added sgf_open_file() sgf_close_file() and sgf_flush_file() to sgf.c
- also added sgf_write_line() and sgf_write_game_info()
- rewrote play_solo to use new sgf routines
- absolutely no more build errors! (at least on Linux...)
- renamed ascii.* play_ascii.*
- moved play_gmp into play_gmp.c and added header file
- added komi option (doesn't do anything yet, just parses it)

2.1.12 released April 29, 1999

- finished adding long options
- color also works now (--handicap and --boardsize have been working)
- needs a little cleanup with short options- some should become long
- finished ASCII interface
- can display any board size up to 25x25
- has command line options and help
- enhanced error messages
- added 'switch' command to switch colors in the middle of play

2.1.11 realeased April 29, 1999

- Minor changes to the syntax of patterns.db and hey.db as a preparation
  for restructuring of patterns.db. Documentation in PATTERNS updated.
- moved ascii play code into ascii.c
- copied showboard code for ascii play into ascii.c (ascii_showboard)
- updated Makefile.am's to reflect changes
- removed posix and error.c files from lib dir- not needed
- added long option parsing; still need to add this to help menu
- moved PATTERNS, DRAGON and OVERVIEW to /docs

2.1.10 released April 28, 1999

- incorporated more reorganizational patches

2.1.9 released April 28, 1999

- Automake-ized (NL)
- Made code which moves dragon[m][n].borders contingent on !worm[m][n].ko
- Set TRUST_GRID back to 1.