- Refactor ttPv reduction conditions : official-stockfish/Stockfish@a…

…a15a91
yaneurao · Feb 15, 2024 · cb0e9fa · cb0e9fa
1 parent 889fada
commit cb0e9fa
Showing 1 changed file with 5 additions and 5 deletions.
diff --git a/source/engine/yaneuraou-engine/yaneuraou-search.cpp b/source/engine/yaneuraou-engine/yaneuraou-search.cpp
@@ -2803,20 +2803,20 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
 
  // 【計測資料 18.】cut nodeのときにreductionを増やすかどうか。
 
- if (cutNode)
- r += 2;
+ if (cutNode)
+ r += 2 - (tte->depth() >= depth && ss->ttPv);
 
  // Increase reduction if ttMove is a capture (~3 Elo)
  // 【計測資料 3.】置換表の指し手がcaptureのときにreduction量を増やす。
 
  if (ttCapture)
  r++;
 
- // Decrease reduction for PvNodes (~2 Elo)
+ // Decrease reduction for PvNodes (~3 Elo)
  // PvNodeではreductionを減らす。
+ if (PvNode && tte->bound() != BOUND_UPPER)
+ r--;
 
- if (PvNode)
- r--;
 
  // Decrease reduction if ttMove has been singularly extended (~1 Elo)
  // ttMoveがsingular extensionで延長されたならreductionを減らす。