/// History::clear() clears the history tables
void History::clear() {
- memset(history, 0, 2 * 8 * 64 * sizeof(int));
- memset(maxStaticValueDelta, 0, 2 * 8 * 64 * sizeof(int));
+ memset(history, 0, 16 * 64 * sizeof(int));
+ memset(maxStaticValueDelta, 0, 16 * 64 * sizeof(int));
}
assert(square_is_ok(to));
history[p][to] += int(d) * int(d);
-
- // Prevent history overflow
- if (history[p][to] >= HistoryMax)
- for (int i = 0; i < 16; i++)
- for (int j = 0; j < 64; j++)
- history[i][j] /= 2;
}
assert(square_is_ok(to));
history[p][to] -= int(d) * int(d);
-
- // Prevent history underflow
- if (history[p][to] <= -HistoryMax)
- for (int i = 0; i < 16; i++)
- for (int j = 0; j < 64; j++)
- history[i][j] /= 2;
-}
-
-
-/// History::move_ordering_score() returns an integer value used to order the
-/// non-capturing moves in the MovePicker class.
-
-int History::move_ordering_score(Piece p, Square to) const {
-
- assert(piece_is_ok(p));
- assert(square_is_ok(to));
-
- return history[p][to];
}
/// gain of a move given the delta of the static position evaluations
/// before and after the move.
-void History::set_gain(Piece p, Square to, Value delta)
-{
+void History::set_gain(Piece p, Square to, Value delta) {
+
if (delta >= maxStaticValueDelta[p][to])
maxStaticValueDelta[p][to] = delta;
else
maxStaticValueDelta[p][to]--;
}
-
-Value History::gain(Piece p, Square to) const
-{
- return Value(maxStaticValueDelta[p][to]);
-}