From: Gontran Lemaire <gontran.lemaire@gmail.com>
Date: Fri, 1 Dec 2017 22:02:45 +0000 (+0000)
Subject: Remove QueenMinorsImbalance array #1340
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=83e829c9dc900dcb00d673417062f4193481ff36;hp=f6981b1321357866e7aff688572e1d0e1fe57c08

Remove QueenMinorsImbalance array #1340

Remove QMI array and adjust bishop, knight and queen coefficients
in QuadraticOurs and QuadraticTheirs arrays in compensation of
this removal.

STC : http://tests.stockfishchess.org/tests/view/5a21d8350ebc590ccbb8b5fe
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 49659 W: 9029 L: 8957 D: 31673

LTC : http://tests.stockfishchess.org/tests/view/5a33c0dd0ebc590ccbb8bd7e
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 45905 W: 5834 L: 5745 D: 34326

Bench: 5176807
---

diff --git a/src/material.cpp b/src/material.cpp
index c0237e7c..8b659ecc 100644
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -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] = {
@@ -50,13 +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
-  };
-
-  // 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
@@ -112,10 +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;
   }