From 8bfb53efe21c314695220a76ab5555492a3cf94a Mon Sep 17 00:00:00 2001 From: joergoster Date: Sat, 19 Apr 2014 16:41:56 +0200 Subject: [PATCH 1/1] Move queen vs. 3 minors rule to imbalance tables Tuned with CLOP after 57k games. Simplification: tested in no-regression mode. Passed both STC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 17254 W: 3159 L: 3032 D: 11063 And LTC LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 32413 W: 4967 L: 4864 D: 22582 bench: 8082049 --- src/material.cpp | 16 +++------------- 1 file changed, 3 insertions(+), 13 deletions(-) diff --git a/src/material.cpp b/src/material.cpp index 9e46d05d..b8152f7d 100644 --- a/src/material.cpp +++ b/src/material.cpp @@ -34,7 +34,7 @@ namespace { // 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, -157 }; const int QuadraticCoefficientsSameColor[][PIECE_TYPE_NB] = { // pair pawn knight bishop rook queen @@ -43,7 +43,7 @@ namespace { { 35, 271, -4 }, // Knight { 0, 105, 4, 0 }, // Bishop { -27, -2, 46, 100, -141 }, // Rook - { 58, 29, 83, 148, -163, 0 } // Queen + {-161, 30, 126, 144, -127, 0 } // Queen }; const int QuadraticCoefficientsOppositeColor[][PIECE_TYPE_NB] = { @@ -54,7 +54,7 @@ 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 + { 103, 90, -40, 142, 268, 0 } // Queen }; // Endgame evaluation and scaling functions are accessed directly and not through @@ -116,16 +116,6 @@ namespace { 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; } -- 2.39.2