More reduction for evading pawn moves.

[stockfish] / src / search.cpp

diff --git a/src/search.cpp b/src/search.cpp
index cf89a8929655e1a822534c3d8e788680e8252f10..d96ed7daac5f4cc44bc579fc827aa5c158423762 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -662,7 +662,7 @@ namespace {
     // search to overwrite a previous full search TT value, so we use a different
     // position key in case of an excluded move.
     excludedMove = ss->excludedMove;
-    posKey = pos.key() ^ Key(excludedMove << 16); // Isn't a very good hash
+    posKey = pos.key() ^ (Key(excludedMove) << 48); // Isn't a very good hash
     tte = TT.probe(posKey, ttHit);
     ttValue = ttHit ? value_from_tt(tte->value(), ss->ply, pos.rule50_count()) : VALUE_NONE;
     ttMove =  rootNode ? thisThread->rootMoves[thisThread->pvIdx].pv[0]
@@ -1186,7 +1186,7 @@ moves_loop: // When in check, search starts from here
               // hence break make_move(). (~2 Elo)
               else if (    type_of(move) == NORMAL
                        && !pos.see_ge(reverse_move(move)))
-                  r -= 2 + ttPv;
+                  r -= 2 + ttPv - (type_of(movedPiece) == PAWN);
 
               ss->statScore =  thisThread->mainHistory[us][from_to(move)]
                              + (*contHist[0])[movedPiece][to_sq(move)]