UndoInfo u;
pos.do_null_move(u);
- Value nullValue = -search(pos, ss, -(beta-1), depth-4*OnePly, ply+1, false, threadID);
+ int R = (depth > 7 ? 4 : 3);
+ Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
pos.undo_null_move(u);
if (nullValue >= beta)
// Update transposition table
TT.store(pos, value_to_tt(bestValue, ply), depth, MOVE_NONE, VALUE_TYPE_EXACT);
+ // Update killers only for good check moves
+ Move m = ss[ply].currentMove;
+ if (alpha >= beta && ok_to_history(pos, m)) // Only non capture moves are considered
+ {
+ // Wrong to update history when depth is <= 0
+
+ if (m != ss[ply].killer1)
+ {
+ ss[ply].killer2 = ss[ply].killer1;
+ ss[ply].killer1 = m;
+ }
+ }
return bestValue;
}
H.success(pos.piece_on(move_from(m)), m, depth);
for (int i = 0; i < moveCount - 1; i++)
- if (ok_to_history(pos, movesSearched[i]) && m != movesSearched[i])
+ {
+ assert(m != movesSearched[i]);
+ if (ok_to_history(pos, movesSearched[i]))
H.failure(pos.piece_on(move_from(movesSearched[i])), movesSearched[i]);
+ }
}
// fail_high_ply_1() checks if some thread is currently resolving a fail