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Languguage OS II Version 10-94 (Knowledge Media)(1994).ISO
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gnuchess.lha
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nondsp.c
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1990-06-09
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/*
nondsp.c - UNIX & MSDOS NON-DISPLAY, AND CHESSTOOL interface for Chess
Revision: 1990-04-18
Copyright (C) 1986, 1987, 1988, 1989, 1990 Free Software Foundation, Inc.
Copyright (c) 1988, 1989, 1990 John Stanback
This file is part of CHESS.
CHESS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY. No author or distributor accepts responsibility to anyone for
the consequences of using it or for whether it serves any particular
purpose or works at all, unless he says so in writing. Refer to the CHESS
General Public License for full details.
Everyone is granted permission to copy, modify and redistribute CHESS, but
only under the conditions described in the CHESS General Public License.
A copy of this license is supposed to have been given to you along with
CHESS so you can know your rights and responsibilities. It should be in a
file named COPYING. Among other things, the copyright notice and this
notice must be preserved on all copies.
*/
#include <ctype.h>
#include <signal.h>
#ifdef MSDOS
#include <dos.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#else
#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/ioctl.h>
void TerminateSearch (int), Die (int);
#endif /* MSDOS */
#include "gnuchess.h"
#define pxx " PNBRQK"
#define qxx " pnbrqk"
#define rxx "12345678"
#define cxx "abcdefgh"
#define printz printf
#define scanz scanf
static char mvstr[4][6];
static char* ColorStr[2] = {"White", "Black"};
static long evrate;
static int mycnt1, mycnt2;
static int ahead;
void
Initialize (void)
{
mycnt1 = mycnt2 = 0;
#ifdef CHESSTOOL
setlinebuf (stdout);
/* setvbuf(stdout,NULL,_IOLBF,BUFSIZ); */
printf ("Chess\n");
if (Level == 0 && !TCflag)
Level = 15;
#endif /* CHESSTOOL */
}
void
ExitChess (void)
{
ListGame ();
exit (0);
}
#ifndef MSDOS /* never called!!! */
void
Die (int sig)
{
char s[80];
ShowMessage ("Abort? ");
scanz ("%s", s);
if (strcmp (s, "yes") == 0)
ExitChess ();
}
#endif /* MSDOS */
void
TerminateSearch (int sig)
{
#ifdef MSDOS
sig++; /* shut up the compiler */
#endif /* MSDOS */
flag.timeout = true;
flag.bothsides = false;
}
void
algbr (short int f, short int t, short int flag)
/*
Generate move strings in different formats.
*/
{
int m3p;
if (f != t)
{
/* algebraic notation */
mvstr[0][0] = cxx[column (f)];
mvstr[0][1] = rxx[row (f)];
mvstr[0][2] = cxx[column (t)];
mvstr[0][3] = rxx[row (t)];
mvstr[0][4] = mvstr[3][0] = '\0';
if ((mvstr[1][0] = pxx[board[f]]) == 'P')
{
if (mvstr[0][0] == mvstr[0][2]) /* pawn did not eat */
{
mvstr[2][0] = mvstr[1][0] = mvstr[0][2]; /* to column */
mvstr[2][1] = mvstr[1][1] = mvstr[0][3]; /* to row */
m3p = 2;
}
else
/* pawn ate */
{
mvstr[2][0] = mvstr[1][0] = mvstr[0][0]; /* from column */
mvstr[2][1] = mvstr[1][1] = mvstr[0][2]; /* to column */
mvstr[2][2] = mvstr[0][3];
m3p = 3; /* to row */
}
mvstr[2][m3p] = mvstr[1][2] = '\0';
if (flag & promote)
{
mvstr[0][4] = mvstr[1][2] = mvstr[2][m3p] = qxx[flag & pmask];
mvstr[1][3] = mvstr[2][m3p + 1] = mvstr[0][5] = '\0';
}
}
else
/* not a pawn */
{
mvstr[2][0] = mvstr[1][0];
mvstr[2][1] = mvstr[0][1];
mvstr[2][2] = mvstr[1][1] = mvstr[0][2]; /* to column */
mvstr[2][3] = mvstr[1][2] = mvstr[0][3]; /* to row */
mvstr[2][4] = mvstr[1][3] = '\0';
strcpy (mvstr[3], mvstr[2]);
mvstr[3][1] = mvstr[0][0];
if (flag & cstlmask)
{
if (t > f)
{
strcpy (mvstr[1], "o-o");
strcpy (mvstr[2], "O-O");
}
else
{
strcpy (mvstr[1], "o-o-o");
strcpy (mvstr[2], "O-O-O");
}
}
}
}
else
mvstr[0][0] = mvstr[1][0] = mvstr[2][0] = mvstr[3][0] = '\0';
}
int
VerifyMove (char *s, short int iop, short unsigned int *mv)
/*
Compare the string 's' to the list of legal moves available for the
opponent. If a match is found, make the move on the board.
*/
{
static short pnt, tempb, tempc, tempsf, tempst, cnt;
static struct leaf xnode;
struct leaf *node;
*mv = 0;
if (iop == 2)
{
UnmakeMove (opponent, &xnode, &tempb, &tempc, &tempsf, &tempst);
return (false);
}
cnt = 0;
MoveList (opponent, 2);
pnt = TrPnt[2];
while (pnt < TrPnt[3])
{
node = &Tree[pnt++];
algbr (node->f, node->t, (short) node->flags);
if (strcmp (s, mvstr[0]) == 0 || strcmp (s, mvstr[1]) == 0 ||
strcmp (s, mvstr[2]) == 0 || strcmp (s, mvstr[3]) == 0)
{
cnt++;
xnode = *node;
}
}
if (cnt == 1)
{
MakeMove (opponent, &xnode, &tempb, &tempc, &tempsf, &tempst, &INCscore);
if (SqAtakd (PieceList[opponent][0], computer))
{
UnmakeMove (opponent, &xnode, &tempb, &tempc, &tempsf, &tempst);
printz ("Illegal move\n");
return (false);
}
else
{
if (iop == 1)
return (true);
UpdateDisplay (xnode.f, xnode.t, 0, (short) xnode.flags);
if ((board[xnode.t] == pawn)
|| (xnode.flags & capture)
|| (xnode.flags & cstlmask))
{
Game50 = GameCnt;
ZeroRPT ();
}
GameList[GameCnt].depth = GameList[GameCnt].score = 0;
GameList[GameCnt].nodes = 0;
ElapsedTime (1);
GameList[GameCnt].time = (short) et;
TimeControl.clock[opponent] -= et;
--TimeControl.moves[opponent];
*mv = (xnode.f << 8) | xnode.t;
algbr (xnode.f, xnode.t, false);
return (true);
}
}
#ifdef CHESSTOOL
printz ("Illegal move\n");
#else
if (cnt > 1)
ShowMessage ("Ambiguous Move!");
#endif
return (false);
}
void
help (void)
{
ClrScreen ();
printz ("CHESS command summary\n");
printz ("----------------------------------------------------------------\n");
printz ("g1f3 move from g1 to f3 quit Exit Chess\n");
printz ("Nf3 move knight to f3 beep on/off\n");
printz ("o-o castle king side easy on/off\n");
printz ("o-o-o castle queen side hash on/off\n");
printz ("bd redraw board reverse board display\n");
printz ("list game to chess.lst book on/off\n");
printz ("undo undo last ply remove take back a move\n");
printz ("edit edit board force enter game moves\n");
printz ("switch sides with computer both computer match\n");
printz ("white computer plays white black computer plays black\n");
printz ("depth set search depth clock set time control\n");
printz ("post principle variation hint suggest a move\n");
printz ("save game to file get game from file\n");
printz ("random randomize play new start new game\n");
printz ("----------------------------------------------------------------\n");
printz ("Computer: %-12s Opponent: %s\n",
ColorStr[computer], ColorStr[opponent]);
printz ("Depth: %-12d Response time: %d sec\n",
MaxSearchDepth, Level);
printz ("Random: %-12s Easy mode: %s\n",
(dither) ? "ON" : "OFF", (flag.easy) ? "ON" : "OFF");
printz ("Beep: %-12s Transposition table: %s\n",
(flag.beep) ? "ON" : "OFF", (flag.hash) ? "ON" : "OFF");
signal (SIGINT, TerminateSearch);
#ifndef MSDOS
signal (SIGQUIT, TerminateSearch);
#endif /* MSDOS */
}
void
EditBoard (void)
/*
Set up a board position. Pieces are entered by typing the piece followed
by the location. For example, Nf3 will place a knight on square f3.
*/
{
short a, r, c, sq, i;
char s[80];
ClrScreen ();
UpdateDisplay (0, 0, 1, 0);
printz (". exit to main\n");
printz ("# clear board\n");
printz ("c change sides\n");
printz ("enter piece & location: \n");
a = white;
do
{
scanz ("%s", s);
if (s[0] == '#')
for(sq = 0; sq < 64; sq++)
{
board[sq] = no_piece;
color[sq] = neutral;
}
if (s[0] == 'c' || s[0] == 'C')
a = otherside[a];
c = s[1] - 'a';
r = s[2] - '1';
if ((c >= 0) && (c < 8) && (r >= 0) && (r < 8))
{
sq = locn (r, c);
color[sq] = a;
board[sq] = no_piece;
for(i = no_piece; i <= king; i++)
if ((s[0] == pxx[i]) || (s[0] == qxx[i]))
{
board[sq] = i;
break;
}
}
} while (s[0] != '.');
for (sq = 0; sq < 64; sq++)
Mvboard[sq] = (board[sq] != Stboard[sq]) ? 10 : 0;
GameCnt = 0;
Game50 = 1;
ZeroRPT ();
InitializeStats ();
ClrScreen ();
UpdateDisplay (0, 0, 1, 0);
}
void
SetupBoard (void)
/*
Compatibility with Unix chess and the nchesstool.
Set up a board position. Eight lines of eight characters are used
to setup the board. a8-h8 is the first line.
Black pieces are represented by uppercase characters.
*/
{
short r, c, sq, i;
char ch;
char s[80];
NewGame ();
gets (s); /* skip "setup" command */
for (r = 7; r >= 0; r--)
{
gets (s);
for (c = 0; c <= 7; c++)
{
ch = s[c];
sq = locn (r, c);
color[sq] = neutral;
board[sq] = no_piece;
for(i = no_piece; i <= king; i++)
if (ch == pxx[i])
{
color[sq] = black;
board[sq] = i;
break;
}
else
if (ch == qxx[i])
{
color[sq] = white;
board[sq] = i;
break;
}
}
}
for (sq = 0; sq < 64; sq++)
Mvboard[sq] = (board[sq] != Stboard[sq]) ? 10 : 0;
InitializeStats ();
ClrScreen ();
UpdateDisplay (0, 0, 1, 0);
printz ("Setup successful\n");
}
void
ShowDepth (char ch)
{
#ifdef MSDOS
ch++; /* shut up the compiler */
#endif /* MSDOS */
}
void
ShowResults (short int score, short unsigned int *bstline, char ch)
{
register int i;
if (flag.post)
{
fprintf (stderr, "%2d%c %6d %4ld %8ld ", Sdepth, ch, score, et, NodeCnt);
for (i = 1; bstline[i] > 0; i++)
{
if ((i > 1) && (i % 8 == 1))
fprintf (stderr, "\n ");
algbr ((short) (bstline[i] >> 8), (short) (bstline[i] & 0xFF), false);
fprintf (stderr, "%5s ", mvstr[0]);
}
fprintf (stderr, "\n");
}
}
void
SearchStartStuff (short int side)
{
signal (SIGINT, TerminateSearch);
#ifndef MSDOS
signal (SIGQUIT, TerminateSearch);
#endif /* MSDOS */
if (flag.post)
{
fprintf (stderr, "\nMove# %d Target= %ld Clock: %ld\n",
TCmoves - TimeControl.moves[side] + 1,
ResponseTime, TimeControl.clock[side]);
}
}
void
OutputMove (void)
{
printz ("%d. ... %s\n", ++mycnt1, mvstr[0]);
if (root->flags & draw)
{
printz ("Draw\n");
ExitChess ();
}
if (root->score == -9999)
{
printz ("%s\n", ColorStr[opponent]);
ExitChess ();
}
if (root->score == 9998)
{
printz ("%s\n", ColorStr[computer]);
ExitChess ();
}
if (flag.post)
{
fprintf (stderr, "Nodes= %ld Eval= %ld Rate= %ld ",
NodeCnt, EvalNodes, evrate);
fprintf (stderr, "Hash/Coll= %ld/%ld\n",
HashCnt, HashCol);
}
UpdateDisplay (root->f, root->t, 0, root->flags);
fprintf (stderr, "My move is: %s\n", mvstr[0]);
if (flag.beep)
printz ("%c", 7);
if (root->flags & draw)
fprintf (stderr, "Drawn game!\n");
else if (root->score == -9999)
fprintf (stderr, "opponent mates!\n");
else if (root->score == 9998)
fprintf (stderr, "computer mates!\n");
else if (root->score < -9000)
fprintf (stderr, "opponent will soon mate!\n");
else if (root->score > 9000)
fprintf (stderr, "computer will soon mate!\n");
}
void
ElapsedTime (short int iop)
/*
Determine the time that has passed since the search was started. If the
elapsed time exceeds the target (ResponseTime+ExtraTime) then set timeout
to true which will terminate the search.
*/
{
if (ahead)
{
#ifndef MSDOS
long nchar;
ioctl(0, FIONREAD, &nchar);
if (nchar)
#else
if (kbhit())
#endif /* MSDOS */
{
flag.timeout = true;
flag.bothsides = false;
}
}
et = time ((long *) 0) - time0;
if (et < 0)
et = 0;
ETnodes += 50;
if (et > et0 || iop == 1)
{
if (et > ResponseTime + ExtraTime && Sdepth > 1)
flag.timeout = true;
et0 = et;
if (iop == 1)
{
time0 = time ((long *) 0);
et0 = 0;
}
if (et > 0)
/* evrate used to be Nodes / cputime I dont` know why */
evrate = NodeCnt / (et + ft);
else
evrate = 0;
ETnodes = NodeCnt + 50;
}
}
void
SetTimeControl (void)
{
if (TCflag)
{
TimeControl.moves[white] = TimeControl.moves[black] = TCmoves;
TimeControl.clock[white] = TimeControl.clock[black] = 60L * TCminutes;
}
else
{
TimeControl.moves[white] = TimeControl.moves[black] = 0;
TimeControl.clock[white] = TimeControl.clock[black] = 0;
Level = 60L * TCminutes;
}
et = 0;
ElapsedTime (1);
}
void
ClrScreen (void)
{
#ifndef CHESSTOOL
printz ("\n");
#endif
}
void
UpdateDisplay (short int f, short int t, short int redraw, short int isspec)
{
#ifndef CHESSTOOL
short r, c, l;
if (redraw)
{
printz ("\n");
for (r = 7; r >= 0; r--)
{
for (c = 0; c <= 7; c++)
{
if (flag.reverse)
l = locn (7 - r, 7 - c);
else
l = locn (r, c);
if (color[l] == neutral)
printz (" -");
else if (color[l] == white)
printz (" %c", qxx[board[l]]);
else
printz (" %c", pxx[board[l]]);
}
printz ("\n");
}
printz ("\n");
}
#endif /* CHESSTOOL */
#ifdef MSDOS
f++; t++; isspec++; /* shut up the compiler */
#endif /* MSDOS */
}
void
GetGame (void)
{
FILE *fd;
char fname[256];
int c;
short sq;
unsigned short m;
printz ("Enter file name: ");
scanz ("%s", fname);
if (fname[0] == '\0')
strcpy (fname, "chess.000");
if ((fd = fopen (fname, "r")) != NULL)
{
fscanf (fd, "%hd%hd%hd", &computer, &opponent, &Game50);
fscanf (fd, "%hd%hd", &castld[white], &castld[black]);
fscanf (fd, "%hd%hd", &TCflag, &OperatorTime);
fscanf (fd, "%ld%ld%hd%hd",
&TimeControl.clock[white], &TimeControl.clock[black],
&TimeControl.moves[white], &TimeControl.moves[black]);
for (sq = 0; sq < 64; sq++)
{
fscanf (fd, "%hd%hd", &m, &Mvboard[sq]);
board[sq] = (m >> 8);
color[sq] = (m & 0xFF);
if (color[sq] == 0)
color[sq] = neutral;
else
--color[sq];
}
GameCnt = 0;
c = '?';
while (c != EOF)
{
++GameCnt;
c = fscanf (fd, "%hd%hd%hd%ld%hd%hd%hd", &GameList[GameCnt].gmove,
&GameList[GameCnt].score, &GameList[GameCnt].depth,
&GameList[GameCnt].nodes, &GameList[GameCnt].time,
&GameList[GameCnt].piece, &GameList[GameCnt].color);
if (GameList[GameCnt].color == 0)
GameList[GameCnt].color = neutral;
else
--GameList[GameCnt].color;
}
GameCnt--;
if (TimeControl.clock[white] > 0)
TCflag = true;
computer--;
opponent--;
}
fclose (fd);
InitializeStats ();
UpdateDisplay (0, 0, 1, 0);
Sdepth = 0;
}
void
SaveGame (void)
{
FILE *fd;
char fname[256];
short sq, i, c;
printz ("Enter file name: ");
scanz ("%s", fname);
if (fname[0] == '\0')
strcpy (fname, "chess.000");
if ((fd = fopen (fname, "w")) != NULL)
{
fprintf (fd, "%d %d %d\n", computer + 1, opponent + 1, Game50);
fprintf (fd, "%d %d\n", castld[white], castld[black]);
fprintf (fd, "%d %d\n", TCflag, OperatorTime);
fprintf (fd, "%ld %ld %d %d\n",
TimeControl.clock[white], TimeControl.clock[black],
TimeControl.moves[white], TimeControl.moves[black]);
for (sq = 0; sq < 64; sq++)
{
if (color[sq] == neutral)
c = 0;
else
c = color[sq] + 1;
fprintf (fd, "%d %d\n", 256 * board[sq] + c, Mvboard[sq]);
}
for (i = 1; i <= GameCnt; i++)
{
if (GameList[i].color == neutral)
c = 0;
else
c = GameList[i].color + 1;
fprintf (fd, "%d %d %d %ld %d %d %d\n",
GameList[i].gmove, GameList[i].score, GameList[i].depth,
GameList[i].nodes, GameList[i].time,
GameList[i].piece, c);
}
fclose (fd);
printz ("Game saved on file: %s", fname);
}
else
printz ("Could not open file: %s", fname);
}
void
ListGame (void)
{
FILE *fd;
short i, f, t;
fd = fopen ("chess.lst", "w");
fprintf (fd, "\n");
fprintf (fd, " score depth nodes time ");
fprintf (fd, " score depth nodes time\n");
for (i = 1; i <= GameCnt; i++)
{
f = GameList[i].gmove >> 8;
t = (GameList[i].gmove & 0xFF);
algbr (f, t, false);
if ((i % 2) == 0)
fprintf (fd, " ");
else
fprintf (fd, "\n");
fprintf (fd, "%5s %5d %2d %7ld %5d", mvstr[0],
GameList[i].score, GameList[i].depth,
GameList[i].nodes, GameList[i].time);
}
fprintf (fd, "\n\n");
fclose (fd);
}
void
Undo (void)
/*
Undo the most recent half-move.
*/
{
short f, t;
f = GameList[GameCnt].gmove >> 8;
t = GameList[GameCnt].gmove & 0xFF;
if (board[t] == king && distance (t, f) > 1)
(void) castle (GameList[GameCnt].color, f, t, 2);
else
{
/* Check for promotion: */
if ((row (f) == 6 && row (t) == 7) || (row (f) == 1 && row (t) == 0))
{
int g, from = f;
for (g = GameCnt - 1; g > 0; g--)
if (GameList[g].gmove & 0xFF == from)
from = GameList[g].gmove >> 8;
if (row (from) == 1 || row (from) == 6)
board[t] = pawn;
}
board[f] = board[t];
color[f] = color[t];
board[t] = GameList[GameCnt].piece;
color[t] = GameList[GameCnt].color;
if (color[t] != neutral)
Mvboard[t]--;
Mvboard[f]--;
}
if (TCflag)
++TimeControl.moves[color[f]];
GameCnt--;
computer = otherside[computer];
opponent = otherside[opponent];
flag.mate = false;
Sdepth = 0;
UpdateDisplay (0, 0, 1, 0);
InitializeStats ();
}
void
ShowMessage (char *s)
{
fprintf (stderr, "%s\n", s);
}
void
ShowSidetomove (void)
{
}
void
PromptForMove (void)
{
#ifndef CHESSTOOL
printz ("\nYour move is? ");
#endif /* CHESSTOOL */
}
void
ShowCurrentMove (short int pnt, short int f, short int t)
{
#ifdef MSDOS
f++; t++; pnt++; /* shut up the compiler */
#endif /* MSDOS */
}
void
ChangeAlphaWindow (void)
{
printz ("window: ");
scanz ("%hd", &Awindow);
}
void
ChangeBetaWindow (void)
{
printz ("window: ");
scanz ("%hd", &Bwindow);
}
void
GiveHint (void)
{
algbr ((short) (hint >> 8), (short) (hint & 0xFF), false);
fprintf (stderr, "Hint: %s\n", mvstr[0]);
}
void
SelectLevel (void)
{
printz ("Enter #moves #minutes: ");
scanz ("%hd %hd", &TCmoves, &TCminutes);
printz ("Operator time= ");
scanz ("%hd", &OperatorTime);
TCflag = (TCmoves > 1);
SetTimeControl ();
}
void
ChangeSearchDepth (void)
{
printz ("depth= ");
scanz ("%hd", &MaxSearchDepth);
}
void
SetContempt (void)
{
printz ("contempt= ");
scanz ("%hd", &contempt);
}
void
ChangeXwindow (void)
{
printz ("xwndw= ");
scanz ("%hd", &xwndw);
}
void
TestSpeed(void (*f) (short int side, short int ply))
{
short i;
long cnt, rate, t1, t2;
t1 = time (0);
for (i = 0; i < 10000; i++)
{
f (opponent, 2);
}
t2 = time (0);
cnt = 10000L * (TrPnt[3] - TrPnt[2]);
rate = cnt / (t2 - t1);
printz ("Nodes= %ld Nodes/sec= %ld\n", cnt, rate);
}
void
InputCommand (void)
/*
Process the users command. If easy mode is OFF (the computer is thinking
on opponents time) and the program is out of book, then make the 'hint'
move on the board and call SelectMove() to find a response. The user
terminates the search by entering ^C (quit siqnal) before entering a
command. If the opponent does not make the hint move, then set Sdepth to
zero.
*/
{
int i;
short ok, tmp;
unsigned short mv;
char s[80];
ok = flag.quit = false;
player = opponent;
ft = 0;
if (hint > 0 && !flag.easy && Book == NULL)
{
fflush (stdout);
time0 = time ((long *) 0);
algbr ((short) hint >> 8, (short) hint & 0xFF, false);
strcpy (s, mvstr[0]);
tmp = epsquare;
if (flag.post)
GiveHint ();
if (VerifyMove (s, 1, &mv))
{
ahead = 1;
SelectMove (computer, 2);
VerifyMove (mvstr[0], 2, &mv);
if (Sdepth > 0)
Sdepth--;
}
ft = time ((long *) 0) - time0;
epsquare = tmp;
}
ahead = 0;
while (!(ok || flag.quit))
{
PromptForMove ();
i = scanz ("%s", s);
if (i == EOF || s[0] == 0)
ExitChess ();
player = opponent;
if (strcmp (s, "bd") == 0)
{
ClrScreen ();
UpdateDisplay (0, 0, 1, 0);
}
else if (strcmp (s, "alg") == 0) /* noop */ ;
else if ((strcmp (s, "quit") == 0) || (strcmp(s, "exit") == 0))
flag.quit = true;
else if (strcmp (s, "post") == 0)
flag.post = !flag.post;
else if ((strcmp (s, "set") == 0) || (strcmp(s, "edit") == 0))
EditBoard ();
else if (strcmp (s, "setup") == 0)
SetupBoard ();
else if (strcmp (s, "go") == 0)
ok = true;
else if (strcmp (s, "help") == 0)
help ();
else if (strcmp (s, "force") == 0)
flag.force = !flag.force;
else if (strcmp (s, "book") == 0)
Book = NULL;
else if (strcmp (s, "new") == 0)
NewGame ();
else if (strcmp (s, "list") == 0)
ListGame ();
else if (strcmp (s, "level") == 0 || strcmp (s, "clock") == 0)
SelectLevel ();
else if (strcmp (s, "hash") == 0)
flag.hash = !flag.hash;
else if (strcmp (s, "beep") == 0)
flag.beep = !flag.beep;
else if (strcmp (s, "Awindow") == 0)
ChangeAlphaWindow ();
else if (strcmp (s, "Bwindow") == 0)
ChangeBetaWindow ();
else if (strcmp (s, "rcptr") == 0)
flag.rcptr = !flag.rcptr;
else if (strcmp (s, "hint") == 0)
GiveHint ();
else if (strcmp (s, "both") == 0)
{
flag.bothsides = !flag.bothsides;
Sdepth = 0;
ElapsedTime (1);
SelectMove (opponent, 1);
ok = true;
}
else if (strcmp (s, "reverse") == 0)
{
flag.reverse = !flag.reverse;
ClrScreen ();
UpdateDisplay (0, 0, 1, 0);
}
else if (strcmp (s, "switch") == 0)
{
computer = otherside[computer];
opponent = otherside[opponent];
flag.force = false;
Sdepth = 0;
ok = true;
}
else if (strcmp (s, "white") == 0 || strcmp (s, "first") == 0)
{
computer = white;
opponent = black;
ok = true;
flag.force = false;
Sdepth = 0;
}
else if (strcmp (s, "black") == 0)
{
computer = black;
opponent = white;
ok = true;
flag.force = false;
Sdepth = 0;
}
else if (strcmp (s, "undo") == 0 && GameCnt > 0)
Undo ();
else if (strcmp (s, "remove") == 0 && GameCnt > 1)
{
Undo ();
Undo ();
}
else if (strcmp (s, "get") == 0)
GetGame ();
else if (strcmp (s, "save") == 0)
SaveGame ();
else if (strcmp (s, "depth") == 0)
ChangeSearchDepth ();
else if (strcmp (s, "random") == 0)
dither = 6;
else if (strcmp (s, "easy") == 0)
flag.easy = !flag.easy;
else if (strcmp (s, "contempt") == 0)
SetContempt ();
else if (strcmp (s, "xwndw") == 0)
ChangeXwindow ();
else if (strcmp (s, "test") == 0)
{
ShowMessage("Testing MoveList Speed");
TestSpeed (MoveList);
ShowMessage("Testing CaptureList Speed");
TestSpeed (CaptureList);
}
else
{
ok = VerifyMove (s, 0, &mv);
if (ok && mv != hint)
{
Sdepth = 0;
ft = 0;
}
}
}
ElapsedTime (1);
if (flag.force)
{
computer = opponent;
opponent = otherside[computer];
}
#ifdef CHESSTOOL
printf ("%d. %s\n", ++mycnt2, s);
#endif /* CHESSTOOL */
signal (SIGINT, TerminateSearch);
#ifndef MSDOS
signal (SIGQUIT, TerminateSearch);
#endif /* MSDOS */
}