X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmaterial.cpp;h=4cfda03e4f3dcab3ee3bfed56553ea379e775826;hp=d67b95cae96413746d77176e1dcf9bcb31c73b98;hb=96362fe3df141eeead4bdb863d2bb2d891886abf;hpb=e551afbab7767ddf79d33c24f8307a8cb291e3cd

diff --git a/src/material.cpp b/src/material.cpp
index d67b95ca..4cfda03e 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -2,7 +2,7 @@
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
   Copyright (C) 2008-2015 Marco Costalba, Joona Kiiski, Tord Romstad
-  Copyright (C) 2015-2017 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
+  Copyright (C) 2015-2018 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -39,7 +39,7 @@ namespace {
     {  32,  255,  -3                    }, // Knight      OUR PIECES
     {   0,  104,   4,    0              }, // Bishop
     { -26,   -2,  47,   105,  -149      }, // Rook
-    {-185,   24, 122,   137,  -134,   0 }  // Queen
+    {-189,   24, 117,   133,  -134, -10 }  // Queen
   };
 
   const int QuadraticTheirs[][PIECE_TYPE_NB] = {
@@ -50,18 +50,7 @@ namespace {
     {   9,   63,   0                    }, // Knight      OUR PIECES
     {  59,   65,  42,     0             }, // Bishop
     {  46,   39,  24,   -24,    0       }, // Rook
-    { 101,  100, -37,   141,  268,    0 }  // Queen
-  };
-
-  // PawnSet[pawn count] contains a bonus/malus indexed by number of pawns
-  const int PawnSet[] = {
-    24, -32, 107, -51, 117, -9, -126, -21, 31
-  };
-
-  // QueenMinorsImbalance[opp_minor_count] is applied when only one side has a queen.
-  // It contains a bonus/malus for the side with the queen.
-  const int QueenMinorsImbalance[13] = {
-    31, -8, -15, -25, -5
+    {  97,  100, -42,   137,  268,    0 }  // Queen
   };
 
   // Endgame evaluation and scaling functions are accessed directly and not through
@@ -79,7 +68,7 @@ namespace {
           && pos.non_pawn_material(us) >= RookValueMg;
   }
 
-  bool is_KBPsKs(const Position& pos, Color us) {
+  bool is_KBPsK(const Position& pos, Color us) {
     return   pos.non_pawn_material(us) == BishopValueMg
           && pos.count<BISHOP>(us) == 1
           && pos.count<PAWN  >(us) >= 1;
@@ -100,9 +89,9 @@ namespace {
 
     const Color Them = (Us == WHITE ? BLACK : WHITE);
 
-    int bonus = PawnSet[pieceCount[Us][PAWN]];
+    int bonus = 0;
 
-    // Second-degree polynomial material imbalance by Tord Romstad
+    // Second-degree polynomial material imbalance, by Tord Romstad
     for (int pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; ++pt1)
     {
         if (!pieceCount[Us][pt1])
@@ -117,10 +106,6 @@ namespace {
         bonus += pieceCount[Us][pt1] * v;
     }
 
-    // Special handling of Queen vs. Minors
-    if  (pieceCount[Us][QUEEN] == 1 && pieceCount[Them][QUEEN] == 0)
-         bonus += QueenMinorsImbalance[pieceCount[Them][KNIGHT] + pieceCount[Them][BISHOP]];
-
     return bonus;
   }
 
@@ -180,7 +165,7 @@ Entry* probe(const Position& pos) {
   // case we don't return after setting the function.
   for (Color c = WHITE; c <= BLACK; ++c)
   {
-    if (is_KBPsKs(pos, c))
+    if (is_KBPsK(pos, c))
         e->scalingFunction[c] = &ScaleKBPsK[c];
 
     else if (is_KQKRPs(pos, c))