int validmove(move m)
{
move_and_score *restore_sp = move_sp;
genmoves();
while(move_sp>restore_sp)
{
move vm = popmove();
if (m == vm)
{
int r = wouldbeincheckfullp(m);
if (r == 0)
{
move_sp = restore_sp;
return 1; /* valid */
}
else
{
move_sp = restore_sp;
return -r; /* invalid move */
}
}
}
return 0; /* move was not found */
}
/* returns -1 for stalemate or winner's color */
int playchess()
{
int use_pondering = 0;
printboard_and_time();
for (;;)
{
long starttime, endtime;
move m;
int g;
g = gameoverp(tomove());
if (g)
{
switch (g)
{
case END_CHECKMATE:
if (tomove() == BLACK)
{
return end(WHITE, "white mates");
}
else
{
return end(BLACK, "black mates");
}
case END_STALEMATE:
return end(-1, "stalemate");
case NON_MATERIAL:
return end(-1, "insufficient material");
case REP_DRAW:
if (!robo_mode)
{
printf("drawable position\n");
}
if (computer[WHITE]||computer[BLACK])
{
if (robo_mode)
tellics("draw\n");
return end(-1, "draw by repetition of moves");
}
break;
}
}
starttime = get_ms();
if (computer[tomove()])
{
m = bce();
if ((m!=dummymove)&&(validmove(m)==1))
{
printf("move %s\n", movestring(m));
}
else
{
if (robo_mode)
{
tellics("mailmoves\n");
tellics(
"message madhacker valid? = %d, move = %s, wouldbeincheckp() = %d, wouldbeinfullcheckp() = %d, pv = %s\n",
validmove(m),
movestring(m),
wouldbeincheckp(m),
wouldbeincheckfullp(m),
thoughts);
tellics("abort\n");
}
else
{
printf("BCE returned invalid move: %s\n", movestring(m));
printf("valid? = %d\n", validmove(m));
fprintf(stdout, "random seed = %ld\n", seed);
fprintf(stdout, "hash = %lld\n", board->hash);
fprintf(stdout, "draw? = %d g = %d\n",
draw_by_rep(), g);
computer[1] = computer[0] = 0;
}
}
use_pondering = 1;
}
else
{
if ((ponder_mode && computer[opp(tomove())])&&
use_pondering)
{
ponder();
use_pondering = 0;
}
m = usermove();
use_pondering = 0;
}
endtime = get_ms();
chessclock[tomove()] -= (endtime-starttime);
chessclock[tomove()] += clockinc;
if (m)
{
domove(m);
update_state(m);
printboard_and_time();
}
}
}
