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#include <stdio.h>
#include "chess.h"
#include "data.h"
/* last modified 11/03/98 */
/*
*******************************************************************************
* *
* EGTBProbe() is the interface to the new tablebase code by Eugene Nalimov. *
* this is called from Search() when 5 or fewer pieces are left on the board. *
* *
*******************************************************************************
*/
#define T_INDEX64
#define XX 127
#define C_PIECES 3 /* Maximum # of pieces of one color OTB */
#if defined (T_INDEX64) && defined (_MSC_VER)
typedef unsigned __int64 INDEX;
#elif defined (T_INDEX64)
typedef unsigned long long INDEX;
#else
typedef unsigned long INDEX;
#endif
typedef unsigned int squaret;
/* Those declarations necessary because Crafty is C, not C++ program */
#if defined (_MSC_VER)
# define TB_FASTCALL __fastcall
#else
# define TB_FASTCALL
#endif
typedef int color;
#define x_colorWhite 0
#define x_colorBlack 1
#define x_colorNeutral 2
#define COLOR_DECLARED
typedef int piece;
#define x_pieceNone 0
#define x_piecePawn 1
#define x_pieceKnight 2
#define x_pieceBishop 3
#define x_pieceRook 4
#define x_pieceQueen 5
#define x_pieceKing 6
#define PIECES_DECLARED
typedef signed char tb_t;
#define pageL 65536
#define tbbe_ssL ((pageL-4)/2)
#define bev_broken (tbbe_ssL+1) /* illegal or busted */
#define bev_mi1 tbbe_ssL /* mate in 1 move */
#define bev_mimin 1 /* mate in max moves */
#define bev_draw 0 /* draw */
#define bev_limax (-1) /* mated in max moves */
#define bev_li0 (-tbbe_ssL) /* mated in 0 moves */
typedef INDEX(TB_FASTCALL * PfnCalcIndex)
(squaret *, squaret *, squaret, int fInverse);
extern int IDescFindFromCounters(int *);
extern int FRegisteredFun(int, color);
extern PfnCalcIndex PfnIndCalcFun(int, color);
extern int TB_FASTCALL L_TbtProbeTable(int, color, INDEX);
#define PfnIndCalc PfnIndCalcFun
#define FRegistered FRegisteredFun
int EGTBProbe(TREE * RESTRICT tree, int ply, int wtm, int *score)
{
int rgiCounters[10], iTb, fInvert;
color side;
squaret rgsqWhite[C_PIECES * 5 + 1], rgsqBlack[C_PIECES * 5 + 1];
squaret *psqW, *psqB, sqEnP;
INDEX ind;
int tbValue;
/*
************************************************************
* *
* initialize counters and piece arrays so the probe code *
* can compute the modified Godel number. *
* *
************************************************************
*/
VInitSqCtr(rgiCounters, rgsqWhite, 0, WhitePawns);
VInitSqCtr(rgiCounters, rgsqWhite, 1, WhiteKnights);
VInitSqCtr(rgiCounters, rgsqWhite, 2, WhiteBishops);
VInitSqCtr(rgiCounters, rgsqWhite, 3, WhiteRooks);
VInitSqCtr(rgiCounters, rgsqWhite, 4, WhiteQueens);
VInitSqCtr(rgiCounters + 5, rgsqBlack, 0, BlackPawns);
VInitSqCtr(rgiCounters + 5, rgsqBlack, 1, BlackKnights);
VInitSqCtr(rgiCounters + 5, rgsqBlack, 2, BlackBishops);
VInitSqCtr(rgiCounters + 5, rgsqBlack, 3, BlackRooks);
VInitSqCtr(rgiCounters + 5, rgsqBlack, 4, BlackQueens);
/*
************************************************************
* *
* quick early exit. is the tablebase for the current *
* set of pieces registered? *
* *
************************************************************
*/
iTb = IDescFindFromCounters(rgiCounters);
if (!iTb)
return (0);
/*
************************************************************
* *
* yes, finish setting up to probe the tablebase. if *
* black is the "winning" side (more pieces) then we need *
* to "invert" the pieces in the lists. *
* *
************************************************************
*/
rgsqWhite[C_PIECES * 5] = WhiteKingSQ;
rgsqBlack[C_PIECES * 5] = BlackKingSQ;
if (iTb > 0) {
side = wtm ? x_colorWhite : x_colorBlack;
fInvert = 0;
psqW = rgsqWhite;
psqB = rgsqBlack;
} else {
side = wtm ? x_colorBlack : x_colorWhite;
fInvert = 1;
psqW = rgsqBlack;
psqB = rgsqWhite;
iTb = -iTb;
}
/*
************************************************************
* *
* now check to see if this particular tablebase for this *
* color to move is registered. *
* *
************************************************************
*/
if (!FRegistered(iTb, side))
return (0);
sqEnP = EnPassant(ply) ? EnPassant(ply) : XX;
ind = PfnIndCalc(iTb, side) (psqW, psqB, sqEnP, fInvert);
tbValue = L_TbtProbeTable(iTb, side, ind);
if (bev_broken == tbValue)
return (0);
/*
************************************************************
* *
* now convert to correct MATE range to match the value *
* Crafty uses. *
* *
************************************************************
*/
if (tbValue > 0)
*score = MATE + 2 * (-bev_mi1 + tbValue - 1);
else if (tbValue < 0)
*score = -MATE + 2 * (bev_mi1 + tbValue);
else
*score = DrawScore(wtm);
return (1);
}
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