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Simplify EVASIONS scoring

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remove some multipliers & adjust, doesn't change the move ordering

STC https://tests.stockfishchess.org/tests/view/6325c1c9b9c0caa5f4a759ae
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 192760 W: 51528 L: 51482 D: 89750
Ptnml(0-2): 642, 20490, 54148, 20380, 720

Credit to locutus2

closes https://github.com/official-stockfish/Stockfish/pull/4171

No functional change
This commit is contained in:
mstembera 2022-09-17 05:45:54 -07:00 • committed by Joost VandeVondele
parent dc0c441b7c
commit 29295ecfd3
1 changed files with 4 additions and 4 deletions
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8
src/movepick.cpp
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@ -145,11 +145,11 @@ void MovePicker::score() {
{
if (pos.capture(m))
m.value = PieceValue[MG][pos.piece_on(to_sq(m))]
- Value(type_of(pos.moved_piece(m)));
- Value(type_of(pos.moved_piece(m)))
+ (1 << 28);
else
m.value = 2 * (*mainHistory)[pos.side_to_move()][from_to(m)]
+ 2 * (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)]
- (1 << 28);
m.value = (*mainHistory)[pos.side_to_move()][from_to(m)]
+ (*continuationHistory[0])[pos.moved_piece(m)][to_sq(m)];
}
}