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GNU GO - the game of Go (Wei-Chi)
Version 1.1 last revised 3-1-89
Copyright (C) Free Software Foundation, Inc.
written by Man L. Li
modified by Wayne Iba
documented by Bob Webber
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 1.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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., 675 Mass Ave, Cambridge, MA 02139, USA.
Please report any bug/fix, modification, suggestion to
mail address: Man L. Li
Dept. of Computer Science
University of Houston
4800 Calhoun Road
Houston, TX 77004
e-mail address: (Internet)
coscgbn@uhvax1.bitnet (BITNET)
70070,404 (CompuServe)
#include <stdio.h>
#define EMPTY 0
extern unsigned char p[19][19], l[19][19];
extern int mymove, umove;
extern int lib;
extern int uik, ujk; /* piece captured */
extern void countlib(int m, int n, int color);
extern void eval(int color);
int suicide(int i, int j)
/* check for suicide move of opponent at p[i][j] */
int m, n, k;
/* check liberty of new move */
lib = 0;
countlib(i, j, umove);
if (lib == 0)
/* new move is suicide then check if kill my pieces and Ko possibility */
/* assume alive */
p[i][j] = umove;
/* check my pieces */
k = 0;
for (m = 0; m < 19; m++)
for (n = 0; n < 19; n++)
/* count pieces will be killed */
if ((p[m][n] == mymove) && !l[m][n]) ++k;
if ((k == 0) || (k == 1 && ((i == uik) && (j == ujk))))
/* either no effect on my pieces or an illegal Ko take back */
p[i][j] = EMPTY; /* restore to open */
return 1;
/* good move */
return 0;
/* valid move */
return 0;
} /* end suicide */