Decrease reduction for exact PV nodes

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 8cb0d11cd324a35d138199e5a4d7d42bb81907cb..031b803417c4c4832f7b6fe5bdb2a3d26618f724 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -162,8 +162,8 @@ namespace {
   // supported by a pawn. If the minor piece occupies an outpost square
   // then score is doubled.
   const Score Outpost[][2] = {
-    { S(22, 6), S(33, 9) }, // Knight
-    { S( 9, 2), S(14, 4) }  // Bishop
+    { S(22, 6), S(36,12) }, // Knight
+    { S( 9, 2), S(15, 5) }  // Bishop
   };
 
   // RookOnFile[semiopen/open] contains bonuses for each rook when there is no
@@ -214,6 +214,7 @@ namespace {
   const Score ThreatBySafePawn    = S(182,175);
   const Score ThreatByRank        = S( 16,  3);
   const Score Hanging             = S( 48, 27);
+  const Score WeakUnopposedPawn   = S(  5, 25);
   const Score ThreatByPawnPush    = S( 38, 22);
   const Score HinderPassedPawn    = S(  7,  0);
   const Score TrappedBishopA1H1   = S( 50, 50);
@@ -439,8 +440,8 @@ namespace {
         // the quality of the pawn shelter (current 'score' value).
         kingDanger =        kingAttackersCount[Them] * kingAttackersWeight[Them]
                     + 102 * kingAdjacentZoneAttacksCount[Them]
-                    + 201 * popcount(kingOnlyDefended)
-                    + 143 * (popcount(undefended) + !!pos.pinned_pieces(Us))
+                    + 191 * popcount(kingOnlyDefended | undefended)
+                    + 143 * !!pos.pinned_pieces(Us)
                     - 848 * !pos.count<QUEEN>(Them)
                     -   9 * mg_value(score) / 8
                     +  40;
@@ -593,6 +594,10 @@ namespace {
             score += ThreatByKing[more_than_one(b)];
     }
 
+    // Bonus for opponent unopposed weak pawns
+    if (pos.pieces(Us, ROOK, QUEEN))
+        score += WeakUnopposedPawn * pe->weak_unopposed(Them);
+
     // Find squares where our pawns can push on the next move
     b  = shift<Up>(pos.pieces(Us, PAWN)) & ~pos.pieces();
     b |= shift<Up>(b & TRank3BB) & ~pos.pieces();