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Quantize eval to multiples of 16

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Removes some excess precision, helps searchs.

Effectively reintroduces evaluation grain, with a slightly different context.
45dbd9cd03

passed STC
LLR: 2.97 (-2.94,2.94) {-0.50,1.50}
Total: 197032 W: 37938 L: 37462 D: 121632
Ptnml(0-2): 3359, 22994, 45446, 23246, 3471
https://tests.stockfishchess.org/tests/view/5ee0c228f29b40b0fc95ae53

passed LTC
LLR: 2.94 (-2.94,2.94) {0.25,1.75}
Total: 77696 W: 9970 L: 9581 D: 58145
Ptnml(0-2): 530, 7075, 23311, 7340, 592
https://tests.stockfishchess.org/tests/view/5ee21426f29b40b0fc95af43

passed LTC SMP
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 64136 W: 7425 L: 7091 D: 49620
Ptnml(0-2): 345, 5416, 20228, 5718, 361
https://tests.stockfishchess.org/tests/view/5ee387bbf29b40b0fc95b04c

closes https://github.com/official-stockfish/Stockfish/pull/2733

Bench: 4939103
This commit is contained in:
Joost VandeVondele 2020-06-10 13:19:21 +02:00 • committed by Stéphane Nicolet
parent c44c62efc2
commit 4d657618e9
1 changed files with 3 additions and 0 deletions
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3
src/evaluate.cpp
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@ -855,6 +855,9 @@ namespace {
Trace::add(MOBILITY, mobility[WHITE], mobility[BLACK]); Trace::add(MOBILITY, mobility[WHITE], mobility[BLACK]);
} }
// Evaluation grain
v = (v / 16) * 16;
// Side to move point of view // Side to move point of view
v = (pos.side_to_move() == WHITE ? v : -v) + Tempo; v = (pos.side_to_move() == WHITE ? v : -v) + Tempo;