StateInfo st;
pos.do_null_move(st);
- int R = (depth >= 4 * OnePly ? 4 : 3); // Null move dynamic reduction
+ int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
Value nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);