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Use more continuation histories.

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This patch allows stats updates and movepicker bonuses for continuation history 3 plies deep - so counter counter move.
Updates and movepicker usage are done with 1/4 multiplier compared to other histories.

Passed STC:
https://tests.stockfishchess.org/tests/view/6528f28d3125598fc7ebb5a3
LLR: 2.96 (-2.94,2.94) <0.00,2.00>
Total: 161344 W: 41369 L: 40868 D: 79107
Ptnml(0-2): 535, 18720, 41679, 19185, 553

Passed LTC:
https://tests.stockfishchess.org/tests/view/652a397a3125598fc7ebd1d6
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 48564 W: 12556 L: 12215 D: 23793
Ptnml(0-2): 25, 5149, 13595, 5486, 27

closes https://github.com/official-stockfish/Stockfish/pull/4827

bench 1327410
This commit is contained in:
Michael Chaly
2023-10-14 17:41:41 +03:00
committed by Joost VandeVondele
parent 002636362e
commit 38e830af4b
2 changed files with 5 additions and 4 deletions
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1
src/movepick.cpp
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@@ -141,6 +141,7 @@ void MovePicker::score() {
m.value = 2 * (*mainHistory)[pos.side_to_move()][from_to(m)];
m.value += 2 * (*continuationHistory[0])[pc][to];
m.value += (*continuationHistory[1])[pc][to];
m.value += (*continuationHistory[2])[pc][to] / 4;
m.value += (*continuationHistory[3])[pc][to];
m.value += (*continuationHistory[5])[pc][to];