/* Search game tree by alpha-beta algorithm */
public int alphabeta(int alpha, int beta, int depth) {
int i, value, best;
if (depth == 0) return eval();
generateMoves();
best = -INFINITY;
for (i = gen_begin[ply]; i < gen_end[ply] && best < beta; i++) {
if (best > alpha) alpha = best;
if (move(gen_dat[i].m)) value = 1000 - ply;
else value = -alphabeta(-beta, -alpha, depth - 1);
unmove();
if (value > best) {
best = value;
if (ply == 0) {
newmove.from = gen_dat[i].m.from;
newmove.dest = gen_dat[i].m.dest;
}
}
}
return best;
}
public int takeAMove(int from, int to) {
generateMoves();
newmove.from = from;
newmove.dest = to;
int ret = MOVE_INVALID;
for (int i = gen_begin[ply]; i < gen_end[ply]; i++) {
if (gen_dat[i].m.from == newmove.from && gen_dat[i].m.dest == newmove.dest) {
if (updateNewMove()) {
return MOVE_WIN;
}
ret = MOVE_OK;
side = xside;
xside = 1 - xside;
break;
}
}
return ret;
}
public void restoreStatus(DataInputStream dis) throws IOException {
for (int i = 0; i < color.length; i++) {
color[i] = dis.readInt();
}
for (int i = 0; i < piece.length; i++) {
piece[i] = dis.readInt();
}
MAX_PLY = dis.readInt();
nodecount = dis.readInt();
brandtotal = dis.readInt();
gencount = dis.readInt();
ply = dis.readInt();
side = dis.readInt();
xside = dis.readInt();
computerside = dis.readInt();
newmove.from = dis.readInt();
newmove.dest = dis.readInt();
for (int i = 0; i < gen_dat.length; i++) {
gen_dat[i].m.from = dis.readInt();
gen_dat[i].m.dest = dis.readInt();
}
for (int i = 0; i < gen_begin.length; i++) {
gen_begin[i] = dis.readInt();
}
for (int i = 0; i < gen_end.length; i++) {
gen_end[i] = dis.readInt();
}
for (int i = 0; i < hist_dat.length; i++) {
hist_dat[i].m.from = dis.readInt();
hist_dat[i].m.dest = dis.readInt();
hist_dat[i].capture = dis.readInt();
}
hdp = dis.readInt();
}
