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Tweak stat bonus

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Increase stat bonus by 1/32 and adjust the divisor of main and capture
history tables to 10692.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 28437 W: 6444 L: 6166 D: 15827
http://tests.stockfishchess.org/tests/view/5b579b4d0ebc5902bdb87139

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 111204 W: 19160 L: 18644 D: 73400
http://tests.stockfishchess.org/tests/view/5b57a7c60ebc5902bdb872d3

Closes https://github.com/official-stockfish/Stockfish/pull/1698

Bench: 4778882
This commit is contained in:
Stefan Geschwentner 2018-07-25 18:01:47 +02:00 • committed by Stéphane Nicolet
parent 6e36860554
commit c4c2e08f0d
2 changed files with 3 additions and 3 deletions
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4
src/movepick.h
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@ -85,14 +85,14 @@ enum StatsParams { NOT_USED = 0 };
/// unsuccessful during the current search, and is used for reduction and move
/// ordering decisions. It uses 2 tables (one for each color) indexed by
/// the move's from and to squares, see chessprogramming.wikispaces.com/Butterfly+Boards
typedef Stats<int16_t, 10368, COLOR_NB, int(SQUARE_NB) * int(SQUARE_NB)> ButterflyHistory;
typedef Stats<int16_t, 10692, COLOR_NB, int(SQUARE_NB) * int(SQUARE_NB)> ButterflyHistory;
/// CounterMoveHistory stores counter moves indexed by [piece][to] of the previous
/// move, see chessprogramming.wikispaces.com/Countermove+Heuristic
typedef Stats<Move, NOT_USED, PIECE_NB, SQUARE_NB> CounterMoveHistory;
/// CapturePieceToHistory is addressed by a move's [piece][to][captured piece type]
typedef Stats<int16_t, 10368, PIECE_NB, SQUARE_NB, PIECE_TYPE_NB> CapturePieceToHistory;
typedef Stats<int16_t, 10692, PIECE_NB, SQUARE_NB, PIECE_TYPE_NB> CapturePieceToHistory;
/// PieceToHistory is like ButterflyHistory but is addressed by a move's [piece][to]
typedef Stats<int16_t, 29952, PIECE_NB, SQUARE_NB> PieceToHistory;

2
src/search.cpp
View file

@ -82,7 +82,7 @@ namespace {
// History and stats update bonus, based on depth
int stat_bonus(Depth depth) {
int d = depth / ONE_PLY;
return d > 17 ? 0 : 32 * d * d + 64 * d - 64;
return d > 17 ? 0 : 33 * d * d + 66 * d - 66;
}
// Skill structure is used to implement strength limit