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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
- 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., 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: manli@cs.uh.edu (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;
-
- findwinner(i, j, val)
- /* find opponent piece to capture or attack */
- int *i, *j, *val;
- {
- int m, n, ti[3], tj[3], tval, ct, u, v, lib1;
-
- *i = -1; *j = -1; *val = -1;
-
- /* find opponent with liberty less than four */
- for (m = 0; m < 19; m++)
- for (n = 0; n < 19; n++)
- if ((p[m][n] == umove) && (l[m][n] < 4))
- {
- ct = 0;
- initmark();
- if (findopen(m, n, ti, tj, umove, l[m][n], &ct))
- {
- if (l[m][n] == 1)
- {
- if (*val < 120)
- {
- *val = 120;
- *i = ti[0];
- *j = tj[0];
- }
- }
- else
- for (u = 0; u < l[m][n]; u++)
- for (v = 0; v < l[m][n]; v++)
- if (u != v)
- {
- lib = 0;
- countlib(ti[u], tj[u], mymove);
- if (lib > 0) /* valid move */
- {
- lib1 = lib;
- p[ti[u]][tj[u]] = mymove;
- /* look ahead opponent move */
- lib = 0;
- countlib(ti[v], tj[v], umove);
- if ((lib1 == 1) && (lib > 0))
- tval = 0;
- else
- tval = 120 - 20 * lib;
- if (*val < tval)
- {
- *val = tval;
- *i = ti[u];
- *j = tj[u];
- }
- p[ti[u]][tj[u]] = EMPTY;
- }
- }
- }
- }
- if (*val > 0) /* find move */
- return 1;
- else /* fail to find winner */
- return 0;
- } /* end findwinner */
-