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Latest topics
»  Cfish: July, 17th 2019
Latest abrok Development Versions  June 20 th EmptyToday at 3:01 pm by When D Green ?

» Nadeln.bin (Powerofsouthsumatera)
Latest abrok Development Versions  June 20 th EmptyYesterday at 10:24 pm by Belladonna

» Stockfish Polyglot: Updated July, 14th, 2019
Latest abrok Development Versions  June 20 th EmptySun Jul 14, 2019 3:28 pm by "B"

» Latest abrok Development Versions July 13 th (SF The gift that keeps on giving )
Latest abrok Development Versions  June 20 th EmptySat Jul 13, 2019 12:16 pm by LondonFrau

» Eman 3.81
Latest abrok Development Versions  June 20 th EmptyFri Jul 12, 2019 1:30 pm by Doppelganger

» Latest abrok Development Versions July 12 th
Latest abrok Development Versions  June 20 th EmptyFri Jul 12, 2019 1:21 pm by "B"

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» ğğğ ctg
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»  Stockfish Polyglot: July, 9th , 2019
Latest abrok Development Versions  June 20 th EmptyTue Jul 09, 2019 9:42 am by When D Green ?

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 Latest abrok Development Versions June 20 th

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"B"
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PostSubject: Latest abrok Development Versions June 20 th   Latest abrok Development Versions  June 20 th EmptyFri Jun 21, 2019 1:43 am




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 Jun 20 16:52:02 2019 +0200
Timestamp: 1561042322

More bonus for free passed pawn

Give even more bonus to passed pawn if adjacent squares to its path
are not attacked.

passed STC
http://tests.stockfishchess.org/tests/view/5d08c9b10ebc5925cf0a6630
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 175197 W: 39859 L: 38816 D: 96522 Elo +2.07

passed LTC
http://tests.stockfishchess.org/tests/view/5d0ab8240ebc5925cf0a8fe4
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 92928 W: 16124 L: 15682 D: 61122 Elo +1.65

Bench: 3398333
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: Miguel Lahoz
Date: Thu Jun 20 16:39:22 2019 +0200
Timestamp: 1561041562

Change multi-cut pruning condition

Use comparison of eval with beta to predict potential cutNodes. This
allows multi-cut pruning to also prune possibly mislabeled Pv and NonPv
nodes.

STC:
LLR: 2.95 (-2.94,2.94) [0.50,4.50]
Total: 54305 W: 12302 L: 11867 D: 30136 Elo +2.78
http://tests.stockfishchess.org/tests/view/5d048ba50ebc5925cf0a15e8

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 189512 W: 32620 L: 31904 D: 124988 Elo +1.31
http://tests.stockfishchess.org/tests/view/5d04bf740ebc5925cf0a17f0

Normally I would think such changes are risky, specially for PvNodes,
but after trying a few other versions, it seems this version is more
sound than I initially thought.

Aside from this, a small funtional change is made to return
singularBeta instead of beta to be more consistent with the fail-soft
logic used in other parts of search.

=============================

How to continue from there ?

We could try to audit other parts of the search where the "cutNode"
variable is used, and try to use dynamic info based on heuristic
eval rather than on this variable, to check if the idea behind this
patch could also be applied successfuly.

Bench: 3503788
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: VoyagerOne
Date: Thu Jun 20 16:22:45 2019 +0200
Timestamp: 1561040565

QuietPick Speed-up

Non-functional speedup: no need to generate, score, or sort quiet moves
if SkipQuiet is true. Thanks to @mstembera for his suggestion.

STC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 27910 W: 6406 L: 6129 D: 15375 Elo +3.45
http://tests.stockfishchess.org/tests/view/5d07e0920ebc5925cf0a58a8

Closes https://github.com/official-stockfish/Stockfish/pull/2194

No functional change
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: Thu Jun 20 16:15:57 2019 +0200
Timestamp: 1561040157

Fix progress issue with shuffling extensions

Fixes issues #2126 and #2189 where no progress in rootDepth is made for particular fens:

8/8/3P3k/8/1p6/8/1P6/1K3n2 b - - 0 1
8/1r1rp1k1/1b1pPp2/2pP1Pp1/1pP3Pp/pP5P/P5K1/8 w - - 79 46

the cause are the shuffle extensions. Upon closer analysis, it appears that in these cases a shuffle extension is made for every node searched, and progess can not be made. This patch implements a fix, namely to limit the number of extensions relative to the number of nodes searched. The ratio employed is 1/4, which fixes the issues seen so far, but it is a heuristic, and I expect that certain positions might require an even smaller fraction.

The patch was tested as a bug fix and passed:

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 56601 W: 12633 L: 12581 D: 31387 Elo +0.32
http://tests.stockfishchess.org/tests/view/5d02b37a0ebc5925cf09f6da

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 52042 W: 8907 L: 8837 D: 34298 Elo +0.47
http://tests.stockfishchess.org/tests/view/5d0319420ebc5925cf09fe57

Furthermore, to confirm that the shuffle extension in this form indeed still brings Elo, one more test at VLTC was performed:
VLTC:
LLR: 2.96 (-2.94,2.94) [0.00,3.50]
Total: 142022 W: 20963 L: 20435 D: 100624 Elo +1.29
http://tests.stockfishchess.org/tests/view/5d03630d0ebc5925cf0a011a

Bench: 3961247

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