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|
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
# This is GNU GO, a Go program. Contact gnugo@gnu.org, or see #
# http://www.gnu.org/software/gnugo/ for more information. #
# #
# Copyright 1999 by the Free Software Foundation. #
# #
# This program is free software; you can redistribute it and/or #
# modify it under the terms of the GNU General Public License #
# as published by the Free Software Foundation - version 2. #
# #
# This program is distributed in the hope that it will be #
# useful, but WITHOUT ANY WARRANTY; without even the implied #
# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR #
# PURPOSE. See the GNU General Public License in file COPYING #
# for more details. #
# #
# You should have received a copy of the GNU General Public #
# License along with this program; if not, write to the Free #
# Software Foundation, Inc., 59 Temple Place - Suite 330, #
# Boston, MA 02111, USA #
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # # #
#
# Database of connection patterns.
#
# ? - don't care
# . - empty
# X - opposite color of O, not easily captured
# O - color of dragon having false or half eye
# x - X or empty
# o - O or empty and an X move here could be captured
# * - cutting point in the O formation, an X move here must be
# tactically safe
# ! - inhibit connection, eye space points for O are turned marginal
#
Pattern 1
?XO
O*!
---
:8,B,NULL
Pattern 2
?XO
O*!
.!.
---
:8,B,NULL
Pattern 3
.O
O.
:X,C,NULL
aO
Ob
;!xcut(a) && !xcut(b)
Pattern 4
OO
..
OO
:+,C,NULL
Pattern 5
# Ok, this is a bit fishy, but we need it in order find the sente
# move at *, threatening to cut.
|.O? force X to connect
|!*X
|.O?
:-,B,NULL
Pattern 6
?O. fragile double connection
X*O
?O.
:8,B,double_does_break_helper
Pattern 7
?OO
o..
?O?
:8,C,NULL
?OO
cba
?O?
;odefend_against(a,b) && olib(c)>1
Pattern 8
?OO
X..
?O?
:8,C,NULL
?OO
Xba
?O?
;odefend_against(a,b)
Pattern 9
# second line clamp
x.!?
XO*!
x.!?
----
:8,B,NULL
Pattern 10
X.O?
.*!?
..!!
----
:8,B,NULL
Pattern 11
O!O
!*X
.O?
:8,B,NULL
O!a
!*X
.b?
;lib(a)==2 || lib(b) == 2
Pattern 12
XO?
O*!
?!?
:8,B,basic_cut_helper
Pattern 13
O
.
O
:+,C,NULL
O
A
O
;!safe_xmove(A)
Pattern 14
.O
..
O.
oO
:8,C,NULL
dO
ab
Oc
oO
;(xplay_attack(a,b,c,a) || xplay_attack(a,b,c,c)) &&
;(xplay_attack(b,a,d,b) || xplay_attack(b,a,d,d))
Pattern 15
XO
O.
:\,C,NULL
AO
OB
;attack(A) || !safe_xmove(B)
Pattern 16
# This pattern is an ugly way to ensure that the X stone is at least
# regarded as a potential cutting stone. The helper returns 0 so the
# pattern does not fire as a B pattern. With an improved connectivity
# analysis, this pattern should no longer be needed.
XO
O*
:8,B,ugly_cutstone_helper
AO
OB
;attack(A) && safe_xmove(B)
Pattern 17
?O.
...
?O.
:+,C,NULL
?Od
cab
?Oe
;olib(c)>1 && xplay_attack(a,b,c,d,e,e)
Pattern 18
OXO
!*!
.!.
---
:8,B,NULL
# END OF FILE
|
