X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.cpp;h=9a120661eb249306d1a52994a4485ea1b6bf60f9;hp=9e46d05d4e74ffc237cc081458e628ffef9ba265;hb=ad937d0b2d2a9450686b9f3412c891a68ff19310;hpb=299afcd88653739b80691991f7e5072a0505f542

diff --git a/src/material.cpp b/src/material.cpp
index 9e46d05d..9a120661 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -27,26 +27,23 @@ using namespace std;
 
 namespace {
 
-  // Values modified by Joona Kiiski
-  const Value MidgameLimit = Value(15581);
-  const Value EndgameLimit = Value(3998);
-
   // Polynomial material balance parameters
 
   //                                  pair  pawn knight bishop rook queen
-  const int LinearCoefficients[6] = { 1852, -162, -1122, -183,  249, -52 };
+  const int LinearCoefficients[6] = { 1852, -162, -1122, -183,  249, -154 };
 
-  const int QuadraticCoefficientsSameColor[][PIECE_TYPE_NB] = {
+  const int QuadraticCoefficientsSameSide[][PIECE_TYPE_NB] = {
+    //            OUR PIECES
     // pair pawn knight bishop rook queen
     {   0                               }, // Bishop pair
     {  39,    2                         }, // Pawn
-    {  35,  271,  -4                    }, // Knight
+    {  35,  271,  -4                    }, // knight      OUR PIECES
     {   0,  105,   4,    0              }, // Bishop
     { -27,   -2,  46,   100,  -141      }, // Rook
-    {  58,   29,  83,   148,  -163,   0 }  // Queen
+    {-177,   25, 129,   142,  -137,   0 }  // Queen
   };
 
-  const int QuadraticCoefficientsOppositeColor[][PIECE_TYPE_NB] = {
+  const int QuadraticCoefficientsOppositeSide[][PIECE_TYPE_NB] = {
     //           THEIR PIECES
     // pair pawn knight bishop rook queen
     {   0                               }, // Bishop pair
@@ -54,7 +51,7 @@ namespace {
     {  10,   62,   0                    }, // Knight      OUR PIECES
     {  57,   64,  39,     0             }, // Bishop
     {  50,   40,  23,   -22,    0       }, // Rook
-    { 106,  101,   3,   151,  171,    0 }  // Queen
+    {  98,  105, -39,   141,  274,    0 }  // Queen
   };
 
   // Endgame evaluation and scaling functions are accessed directly and not through
@@ -110,22 +107,12 @@ namespace {
         v = LinearCoefficients[pt1];
 
         for (pt2 = NO_PIECE_TYPE; pt2 <= pt1; ++pt2)
-            v +=  QuadraticCoefficientsSameColor[pt1][pt2] * pieceCount[Us][pt2]
-                + QuadraticCoefficientsOppositeColor[pt1][pt2] * pieceCount[Them][pt2];
+            v +=  QuadraticCoefficientsSameSide[pt1][pt2] * pieceCount[Us][pt2]
+                + QuadraticCoefficientsOppositeSide[pt1][pt2] * pieceCount[Them][pt2];
 
         value += pc * v;
     }
 
-    // Queen vs. 3 minors slightly favours the minors
-    if (pieceCount[Us][QUEEN] == 1 && pieceCount[Them][QUEEN] == 0)
-    {
-        int n = pieceCount[Them][KNIGHT] - pieceCount[Us][KNIGHT];
-        int b = pieceCount[Them][BISHOP] - pieceCount[Us][BISHOP];
-
-        if ((n == 2 && b == 1) || (n == 1 && b == 2))
-            value -= 66 * 16;
-    }
-
     return value;
   }