//generate all possible moves
void Gen(void)
{
short i, j, k, n, p, x, y, t, fcannon;
gen_end[ply] = gen_begin[ply];
for (i=0; i < BOARD_SIZE; i++){
if (color[i]==side)
{
p = piece[i];//piece kind
for (j=0; j<8; j++)
{
if (!offset[p][j]) break;//find possible next position
x = mailbox90[i]; //offset in mailbox128
fcannon = 0;
if (p==ROOK || p==CANNON) n = 9; else n = 1;//
for (k=0; k<n; k++)
{
// get offset result for (p==PAWN && side==LIGHT)
//there is no offset table for it
if (p==PAWN && side==LIGHT) x -= offset[p][j]; else x += offset[p][j];
y = mailbox182[x];
// t for the position in the board of this piece ,
//according which side the piece is
if (side == DARK) t = y; else t = 89-y;
if (y==-1 || (legalposition[t] & maskpiece[p])==0) break;
if (!fcannon)
{
if (color[y]!=side)
switch (p)
{
case KNIGHT: if (color[i+knightcheck[j]]==EMPTY) Gen_push(i, y); break;
case ELEPHANT:if (color[i+elephancheck[j]]==EMPTY) Gen_push(i, y); break;
case CANNON: if (color[y]==EMPTY) Gen_push(i, y); break;
default: Gen_push(i, y);
}
if (color[y]!=EMPTY) { if (p==CANNON) fcannon++; else break; }
}
else /* CANNON switch */
{
if (color[y] != EMPTY)
{
if (color[y]==xside) Gen_push(i, y);
break;
}
}
} /* for k */
} /* for j */
}
}
gen_end[ply+1] = gen_end[ply]; gen_begin[ply+1] = gen_end[ply];
brandtotal += gen_end[ply] - gen_begin[ply]; gencount++;
}
void Gen(void)
{
short i, j, k, n, p, x, y, t, fcannon;
gen_end[ply] = gen_begin[ply];
for (i=0; i < BOARD_SIZE; i++)
if (color[i]==side)
{
p = piece[i];
for (j=0; j<8; j++)
{
if (!offset[p][j]) break;
x = mailbox90[i]; fcannon = 0;
if (p==ROOK || p==CANNON) n = 9; else n = 1;
for (k=0; k<n; k++)
{
if (p==PAWN && side==LIGHT) x -= offset[p][j]; else x += offset[p][j];
y = mailbox182[x];
if (side == DARK) t = y; else t = 89-y;
if (y==-1 || (legalposition[t] & maskpiece[p])==0) break;
if (!fcannon)
{
if (color[y]!=side)
switch (p)
{
case KNIGHT: if (color[i+knightcheck[j]]==EMPTY) Gen_push(i, y); break;
case ELEPHAN:if (color[i+elephancheck[j]]==EMPTY) Gen_push(i, y); break;
case CANNON: if (color[y]==EMPTY) Gen_push(i, y); break;
default: Gen_push(i, y);
}
if (color[y]!=EMPTY) { if (p==CANNON) fcannon++; else break; }
}
else /* CANNON switch */
{
if (color[y] != EMPTY)
{
if (color[y]==xside) Gen_push(i, y);
break;
}
}
} /* for k */
} /* for j */
}
gen_end[ply+1] = gen_end[ply]; gen_begin[ply+1] = gen_end[ply];
brandtotal += gen_end[ply] - gen_begin[ply]; gencount++;
}
