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» Cfish 11a from syzygy1
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyToday at 3:58 am by Belladonna

» BrainFish 10th July 2020
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyYesterday at 6:57 am by Clair Ph.U.K

» Latest abrok Development Versions July 9th (SF The gift that keeps on giving )
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyYesterday at 6:49 am by "B"

» M8.7 ctg by Sniper34
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyFri Jul 10, 2020 4:27 pm by Doppelganger

» Houdidit engine
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyThu Jul 09, 2020 3:55 pm by Play4Fun

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Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyWed Jul 08, 2020 6:08 pm by Play4Fun

» BrainFish 5th July 2020
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyWed Jul 08, 2020 4:47 pm by Clair Ph.U.K

» Latest abrok Development Versions July 6th (SF The gift that keeps on giving )
Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyTue Jul 07, 2020 1:58 pm by "B"

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 Latest abrok Development Version November 18th (SF The gift that keeps on giving )

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Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) Empty
PostSubject: Latest abrok Development Version November 18th (SF The gift that keeps on giving )   Latest abrok Development Version   November 18th (SF The gift that keeps on giving ) EmptyMon Nov 18, 2019 10:40 am

!! latest version !!


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: Joost VandeVondele
Date: Mon Nov 18 09:57:53 2019 +0100
Timestamp: 1574067473

Use exploration rate for reductions

This patch measures how frequently search is exploring new configurations.
This is done be computing a running average of ttHit. The ttHitAverage rate
is somewhat low (e.g. 30% for startpos) in the normal case, while it can be
very high if no progress is made (e.g. 90% for the fortress I used for testing).

This information can be used to influence search. In this patch, by adjusting
reductions if the rate > 50%. A first version (using a low ttHitAverageResolution
and this 50% threshold) passed testing:

STC
LLR: 2.96 (-2.94,2.94) [-1.50,4.50]
Total: 26425 W: 5837 L: 5650 D: 14938 Elo +2.46
http://tests.stockfishchess.org/tests/view/5dcede8b0ebc5902563258fa

LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 32313 W: 5392 L: 5128 D: 21793 Elo +2.84
http://tests.stockfishchess.org/tests/view/5dcefb1f0ebc590256325c0e

However, as discussed in pull request 2414, using a larger ttHitAverageResolution
gives a better approximation of the underlying distributions. This needs a slight
adjustment for the threshold as the new distributions are shifted a bit compared
to the older ones, and this threshold seemingly is sensitive (we used 0.53125 here).
https://github.com/official-stockfish/Stockfish/pull/2414

This final version also passed testing, and is used for the patch:

STC
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 16025 W: 3555 L: 3399 D: 9071 Elo +3.38
http://tests.stockfishchess.org/tests/view/5dd070b90ebc5902579e20c2

LTC
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 37576 W: 6277 L: 5998 D: 25301 Elo +2.58
http://tests.stockfishchess.org/tests/view/5dd0f58e6f544e798086f224

Closes https://github.com/official-stockfish/Stockfish/pull/2414

Bench: 4989584



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