Reduce more CUT nodes only if parent node is reduced

[stockfish] / src / material.cpp

diff --git a/src/material.cpp b/src/material.cpp
index 3474ccd576c5e613c7fd3373b0e71edf6fd1ca1c..c1247b6348ff5069a9dfcc42282a14bf64d37970 100644 (file)
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -35,18 +35,18 @@ namespace {
   const int NoPawnsSF[4] = { 6, 12, 32 };
 
   // Polynomial material balance parameters
-  const Value RedundantQueenPenalty = Value(320);
-  const Value RedundantRookPenalty  = Value(554);
+  const Value RedundantQueen = Value(320);
+  const Value RedundantRook  = Value(554);
 
   //                                  pair  pawn knight bishop rook queen
-  const int LinearCoefficients[6] = { 1617, -162, -1172,  -62,  105,  26 };
+  const int LinearCoefficients[6] = { 1617, -162, -1172, -190,  105,  26 };
 
   const int QuadraticCoefficientsSameColor[][PIECE_TYPE_NB] = {
     // pair pawn knight bishop rook queen
     {   7                               }, // Bishop pair
     {  39,    2                         }, // Pawn
     {  35,  271,  -4                    }, // Knight
-    {   7,   25,   4,    7              }, // Bishop
+    {   7,  105,   4,    7              }, // Bishop
     { -27,   -2,  46,   100,   56       }, // Rook
     {  58,   29,  83,   148,   -3,  -25 }  // Queen
   };
@@ -109,8 +109,8 @@ namespace {
     // Redundancy of major pieces, formula based on Kaufman's paper
     // "The Evaluation of Material Imbalances in Chess"
     if (pieceCount[Us][ROOK] > 0)
-        value -=  RedundantRookPenalty * (pieceCount[Us][ROOK] - 1)
-                + RedundantQueenPenalty * pieceCount[Us][QUEEN];
+        value -=  RedundantRook * (pieceCount[Us][ROOK] - 1)
+                + RedundantQueen * pieceCount[Us][QUEEN];
 
     // Second-degree polynomial material imbalance by Tord Romstad
     for (pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; pt1++)