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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
- NeXT version by John Neil
- */
- /*
- 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)
-
- For the NeXT version, please report any bug/fix, modification, suggestion to
-
- mail address: John Neil
- Mathematics Department
- Portland State University
- PO Box 751
- Portland, OR 97207
-
- e-mail address: neil@math.mth.pdx.edu (Internet)
- neil@psuorvm.bitnet (BITNET)
- */
-
- #define EMPTY 0
- #define MAXTRY 400
- #define BLACKSTONE 2
-
- extern unsigned char p[19][19];
- extern int currentStone, opposingStone, MAXX, MAXY;
- extern int rd, lib, blackPassed, whitePassed;
- extern void eval(int);
- extern int findwinner(int*,int*,int*);
- extern int findsaver(int*,int*,int*);
- extern int findpatn(int*,int*,int*);
- extern void countlib(int,int,int);
- extern int fioe(int,int);
- extern void Random(int*);
-
- void genmove(int *i, int *j)
- /* generate computer move */
- {
- int ti, tj, tval;
- int val;
- int try = 0; /* number of try */
-
- /* initialize move and value */
- *i = -1; *j = -1; val = -1;
-
- /* re-evaluate liberty of opponent pieces */
- eval(opposingStone);
-
- /* find opponent piece to capture or attack */
- if (findwinner(&ti, &tj, &tval))
- if (tval > val)
- {
- val = tval;
- *i = ti;
- *j = tj;
- }
-
- /* save any piece if threaten */
- if (findsaver(&ti, &tj, &tval))
- if (tval > val)
- {
- val = tval;
- *i = ti;
- *j = tj;
- }
-
- /* try match local play pattern for new move */
- if (findpatn(&ti, &tj, &tval))
- if (tval > val)
- {
- val = tval;
- *i = ti;
- *j = tj;
- }
-
- /* no urgent move then do random move */
- if (val < 0)
- do {
- Random(&rd);
- *i = rd % MAXX;
- /* avoid low line and center region */
- if ((*i < 2) || (*i > MAXX - 3) || ((*i > (MAXX/2) - 2) && (*i < (MAXX/2) + 2)))
- {
- Random(&rd);
- *i = rd % MAXX;
- if ((*i < 2) || (*i > MAXX - 3))
- {
- Random(&rd);
- *i = rd % MAXX;
- }
- }
- Random(&rd);
- *j = rd % MAXY;
- /* avoid low line and center region */
- if ((*j < 2) || (*j > MAXY - 3) || ((*j > (MAXX/2) - 2) && (*j < (MAXY/2) + 2)))
- {
- Random(&rd);
- *j = rd % MAXY;
- if ((*j < 2) || (*j > MAXY - 3))
- {
- Random(&rd);
- *j = rd % MAXY;
- }
- }
- lib = 0;
- countlib(*i, *j, currentStone);
- }
- /* avoid illegal move, liberty one or suicide, fill in own eye */
- while ((++try < MAXTRY)
- && ((p[*i][*j] != EMPTY) || (lib < 3) || fioe(*i, *j)));
-
- if (try >= MAXTRY) /* computer pass */
- {
- if (currentStone == BLACKSTONE)
- blackPassed = 1;
- else
- whitePassed = 1;
- *i = -1;
- }
- else /* find valid move */
- {
- if (currentStone == BLACKSTONE)
- blackPassed = 0;
- else
- whitePassed = 0;
- }
- } /* end genmove */
-