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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];
- extern int mymove, umove;
- extern int opn[9];
-
- findpatn(i, j, val)
- /* find pattern to match for next move */
- int *i, *j, *val;
- {
- int m, n;
- int ti, tj, tval;
- static int cnd, mtype; /* game tree node number, move type */
- /* mtype = 0, basic; 1, inverted; 2, reflected; 3, inverted & reflected */
-
- /* open game then occupy corners */
- if (opn[4]) /* continue last move */
- {
- opn[4] = 0; /* clear flag */
- if (opening(i, j, &cnd, mtype)) opn[4] = 1; /* more move then reset flag */
- if (p[*i][*j] == EMPTY) /* valid move */
- {
- *val = 80;
- return 1;
- }
- else
- opn[4] = 0;
- }
-
- if (opn[0]) /* Northwest corner */
- {
- opn[0] = 0; /* clear flag */
- if (openregion(0, 0, 5, 5))
- {
- cnd = 0;
- mtype = 0;
- opening(i, j, &cnd, mtype); /* get new node for next move */
- if (opening(i, j, &cnd, mtype)) opn[4] = 1;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[1]) /* Southwest corner */
- {
- opn[1] = 0;
- if (openregion(13, 0, 18, 5))
- {
- cnd = 0;
- mtype = 1;
- opening(i, j, &cnd, mtype); /* get new node for next move */
- if (opening(i, j, &cnd, mtype)) opn[4] = 1;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[2]) /* Northeast corner */
- {
- opn[2] = 0;
- if (openregion(0, 13, 5, 18))
- {
- cnd = 0;
- mtype = 2;
- opening(i, j, &cnd, mtype); /* get new node for next move */
- if (opening(i, j, &cnd, mtype)) opn[4] = 1;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[3]) /* Northeast corner */
- {
- opn[3] = 0;
- if (openregion(13, 13, 18, 18))
- {
- cnd = 0;
- mtype = 3;
- opening(i, j, &cnd, mtype); /* get new node for next move */
- if (opening(i, j, &cnd, mtype)) opn[4] = 1;
- *val = 80;
- return 1;
- }
- }
-
- /* occupy edges */
- if (opn[5]) /* North edge */
- {
- opn[5] = 0;
- if (openregion(0, 6, 4, 11))
- {
- *i = 3;
- *j = 9;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[6]) /* South edge */
- {
- opn[6] = 0;
- if (openregion(18, 6, 14, 11))
- {
- *i = 15;
- *j = 9;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[7]) /* West edge */
- {
- opn[7] = 0;
- if (openregion(6, 0, 11, 4))
- {
- *i = 9;
- *j = 3;
- *val = 80;
- return 1;
- }
- }
-
- if (opn[8]) /* East edge */
- {
- opn[8] = 0;
- if (openregion(6, 18, 11, 14))
- {
- *i = 9;
- *j = 15;
- *val = 80;
- return 1;
- }
- }
-
- *i = -1;
- *j = -1;
- *val = -1;
-
- /* find local pattern */
- for (m = 0; m < 19; m++)
- for (n = 0; n < 19; n++)
- if ((p[m][n] == mymove) &&
- (matchpat(m, n, &ti, &tj, &tval) && (tval > *val)))
- {
- *val = tval;
- *i = ti;
- *j = tj;
- }
- if (*val > 0) /* pattern found */
- return 1;
- else /* no match found */
- return 0;
- } /* end findpatn */
-