!! latest version !!Windows x64 for Haswell CPUsWindows x64 for modern computers + AVX2Windows x64 for modern computersWindows x64 + SSSE3Windows x64Linux x64 for Haswell CPUsLinux x64 for modern computers + AVX2Linux x64 for modern computersLinux x64 + SSSE3Linux x64Author: Stefan Geschwentner
Date: Tue Nov 7 08:28:43 2023 +0100
Timestamp: 1699342123
Double weight of pawn history for quiet move ordering.
I measured on my 1000 position bench the average additional added pawn history per depth.
This shows on average negative value with even smaller values with increaing depth.
A linear regression against depth get following formula:
-1960 - 130 * depth
For compensation add this to the used sort limit to maintain roughly the same proportion of sorted quiet moves.
Remarks:
1. using no compensation failed here
https://tests.stockfishchess.org/tests/view/6547664f136acbc5735265f0 2. using only the compensation failed at LTC:
passed STC:
https://tests.stockfishchess.org/tests/view/65477457136acbc5735266f8 failed LTC:
https://tests.stockfishchess.org/tests/view/65487fc8136acbc573527d1c STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 98528 W: 25109 L: 24699 D: 48720
Elo +1.45Ptnml(0-2): 334, 11586, 25009, 12006, 329
https://tests.stockfishchess.org/tests/view/65475873136acbc5735264f7 LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 69726 W: 17467 L: 17073 D: 35186
Elo +1.96Ptnml(0-2): 39, 7814, 18769, 8196, 45
https://tests.stockfishchess.org/tests/view/6547e759136acbc573527071 closes
https://github.com/official-stockfish/Stockfish/pull/4866 Bench: 1379422
see source
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