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 |  Subject: Latest abrok Development Versions September 12th (SF The gift that keeps on giving ) Thu Sep 12, 2019 2:51 pm | |
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Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64 | Author: Vizvezdenec
Date: Thu Sep 12 10:33:18 2019 +0200
Timestamp: 1568277198
Scale down complexity for almost unwinnable endgames
This patch greatly scales down complexity of endgames when the
following conditions are all true together:
- pawns are all on one flank
- stronger side king is not outflanking weaker side
- no passed pawns are present
This should improve stockfish evaluation of obvious draws 4 vs 3, 3 vs 2
and 2 vs 1 pawns in rook/queen/knight/bishop single flank endgames where
strong side can not make progress.
passed STC
LLR: 2.94 (-2.94,2.94) [0.50,4.50]
Total: 15843 W: 3601 L: 3359 D: 8883 Elo +5.31
passed LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 121275 W: 20107 L: 19597 D: 81571 Elo +1.46
Closes https://github.com/official-stockfish/Stockfish/pull/2298
Bench: 3954190
==========================
How to continue from there?
a) This could be a powerful idea for refining some parts of the evaluation
function, a bit like when we try quadratics or other equations to emphasize
certain situations (xoto10).
b) Some other combinaison values for this bonus can be done further, or
overall retuning of weight and offset while keeping the formula simple. | Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64 | Author: xoto10
Date: Thu Sep 12 10:05:35 2019 +0200
Timestamp: 1568275535
Bonus for rook on same file as their queen
This patch creates a simple bonus for a rook that is on the same file as the
opponent's queen.
STC 10+0.1 th 1 :
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 45609 W: 10120 L: 9733 D: 25756 Elo +2.95
http://tests.stockfishchess.org/tests/view/5d79895a0ebc5902d385484a
LTC 60+0.6 th 1 :
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 51651 W: 8606 L: 8288 D: 34757 Elo +2.14
http://tests.stockfishchess.org/tests/view/5d79a0850ebc5902d3854d27
Many thanks to @noobpwnftw for providing the extra cpu resources for fishtest,
which led to me doing these tests.
Closes https://github.com/official-stockfish/Stockfish/pull/2297
Bench: 4024461 | Windows x64 for Haswell CPUs
Windows x64 for modern computers
Windows x64
Windows 32
Linux x64 for Haswell CPUs
Linux x64 for modern computers
Linux x64 | Author: protonspring
Date: Thu Sep 12 09:44:40 2019 +0200
Timestamp: 1568274280
Simplify Weak Lever
This is a simplification that integrated WeakLever into doubled pawns.
Since we already check for !support for Doubled pawns, it is trivial
to check for weak lever by just checking more_than_one(lever).
We also introduce the Score * bool operation overload to remove some
casts in the code.
STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 26757 W: 5842 L: 5731 D: 15184 Elo +1.44
http://tests.stockfishchess.org/tests/view/5d77ee220ebc5902d384e5a4
Closes https://github.com/official-stockfish/Stockfish/pull/2295
No functional change |
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