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a530fc2)
After 994 games at 1+0
Mod vs Orig +244 =521 -229 50.75% 504.5/994 +5 ELO
Signed-off-by: Marco Costalba <mcostalba@gmail.com>
ss[ply].currentMove = MOVE_NULL;
pos.do_null_move(st);
ss[ply].currentMove = MOVE_NULL;
pos.do_null_move(st);
- int R = (depth >= 5 * OnePly ? 4 : 3); // Null move dynamic reduction
+
+ // Null move dynamic reduction based on depth
+ int R = (depth >= 5 * OnePly ? 4 : 3);
+
+ // Null move dynamic reduction based on value
+ if (approximateEval - beta > PawnValueMidgame)
+ R++;
nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);
nullValue = -search(pos, ss, -(beta-1), depth-R*OnePly, ply+1, false, threadID);