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Author SHA1 Message Date
Steinar H. Gunderson fa1ab27e15 Merge commit 'aff1f67997cd2584ea7c82d967ac7bfd4cc77861' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 16:59:53 +01:00
Steinar H. Gunderson e8bc8639fc Merge commit '93869d5d0aab2f7121bdf227def3a942c9fcde17' into cluster 2025-12-25 16:59:18 +01:00
Steinar H. Gunderson a5c89f4592 Merge commit '60351b9df901ff5278f208a9cf3a40059ff54832' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 16:56:54 +01:00
Steinar H. Gunderson a449238954 Merge commit '703f17975bd9c29172a27f795ca6b5a7d0a32b25' into cluster 2025-12-25 16:55:54 +01:00
Steinar H. Gunderson 0043886170 Merge commit 'e57fba7fc9be461cbb97c063b269a1e231cdd284' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 16:54:13 +01:00
Steinar H. Gunderson 0814961843 Merge commit '6135a0e2f830a587d2ac7a332bb62188fa924aad' into cluster 2025-12-25 16:52:43 +01:00
Steinar H. Gunderson 1cffdc1ce4 Merge commit '7e72b37e4ce3351399bb0ac08686bd84cdc4fba9' into cluster 2025-12-25 16:03:31 +01:00
Steinar H. Gunderson 0c451731c6 Merge commit '98a7bb4436f04505a17f37befab0207252e97897' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 16:00:06 +01:00
Steinar H. Gunderson a20c6d296a Merge commit '362a77a3450335e1940020c080bf3b7b361c594a' into cluster 2025-12-25 15:53:03 +01:00
Steinar H. Gunderson d002e92294 Merge commit 'b209f14b1ee0cda8cbd7fa3a8349e65701d1869f' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 15:48:01 +01:00
Steinar H. Gunderson d83e63c163 Merge commit '5d3517c601c64d026824251784dd44f0cbf14873' into cluster 2025-12-25 15:30:32 +01:00
Steinar H. Gunderson d7cf6e22fd Merge commit '5752529cabb3270e055147709ff0847e4d59ec22' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 15:27:42 +01:00
Steinar H. Gunderson d1b19aad2f Merge commit '2cbc20e846e46da8bfc8e254a7703a0bfad3b850' into cluster 2025-12-25 15:26:23 +01:00
Steinar H. Gunderson 8f9e750782 Merge commit '3c379e55d9d92a5704632c6255e72892a4db9a2f' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 15:22:41 +01:00
Steinar H. Gunderson cefd309d92 Merge commit '25361e514bffb81284d4311601a9f7a4a7ced79b' into cluster 2025-12-25 15:22:02 +01:00
Steinar H. Gunderson 46264c6ed7 Merge commit '74a8fc060465a822f0c047f908d5fb07ebc6ad96' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 15:16:24 +01:00
Steinar H. Gunderson 5c9ed18b48 Merge commit 'b01fdb596a196f966549f7132c042ab67962fbbd' into cluster 2025-12-25 15:16:01 +01:00
Steinar H. Gunderson 7df644a00a Merge commit '44cddbd962c738678f407a7414efa5b93f0710d9' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 15:10:02 +01:00
Steinar H. Gunderson 876495975e Merge commit 'c8213ba0d047569141ed58f5eb86579d976b5614' into cluster 
As part of this work, we needed to rename the namespace Stockfish::Cluster
to Stockfish::Distributed, as Cluster is now a type name.
 2025-12-25 00:17:08 +01:00
Steinar H. Gunderson f358a30ea0 Merge commit '7e890fd048e22bfd213d46ec8eb88f7931f0315d' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 16:29:33 +01:00
Steinar H. Gunderson 5034cf6593 Merge commit '66ed4312f22a951aaa01bbb87b2d730656b8f2c1' into cluster 2025-12-24 16:28:21 +01:00
Steinar H. Gunderson 52d8388101 Merge commit 'e6c83beed12a6d3d17c69bea4bcf1a397bc60c86' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 16:27:16 +01:00
Steinar H. Gunderson 9770899bf7 Merge commit '5688b188cc8560e107815c83a7084220fddebdb9' into cluster 2025-12-24 16:26:53 +01:00
Steinar H. Gunderson 639294636e Merge commit '36eb9bc783d35842571d0d4313349b964892d9ca' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 16:26:07 +01:00
Steinar H. Gunderson 75138525c7 Merge commit '00a28ae325688346e63a452b2050bd1491085359' into cluster 2025-12-24 16:25:32 +01:00
Steinar H. Gunderson 784db2cbed Merge commit 'a2a7edf4c8fa145667135bf1bc7f4f67016f7608' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 16:19:29 +01:00
Steinar H. Gunderson bc81aa0911 Merge commit 'a169c78b6d3b082068deb49a39aaa1fd75464c7f' into cluster 2025-12-24 16:18:37 +01:00
Steinar H. Gunderson e56697e3f1 Merge commit 'b0287dcb1c436887075962b596cf2068d2ca9ba8' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 15:23:14 +01:00
Steinar H. Gunderson 125f4f3df0 Merge commit 'ed79745bb9e7207b604c62758ea45dd5c597ed8d' into cluster 2025-12-24 15:22:12 +01:00
Steinar H. Gunderson ea9a328340 Merge commit 'c14b69790a62aad89fcc471cde482923dfe57f1e' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 15:17:55 +01:00
Steinar H. Gunderson fb9a3d3323 Merge commit '2dbb44e28d2e5b3c72ddbbd6f436d41f75031a22' into cluster 2025-12-24 15:17:18 +01:00
Steinar H. Gunderson 649004ed47 Merge commit 'db147fe2586527a854516016699949af53dc5b17' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 15:14:23 +01:00
Steinar H. Gunderson b7045f1bf6 Merge commit 'bc45cbc820a53a9fc405c06ca67bd7be3970344e' into cluster 2025-12-24 15:13:28 +01:00
Steinar H. Gunderson 5f5f991780 Merge commit '3502c8ae426506453ca64e87e48d962b327c2356' into cluster 2025-12-24 15:12:37 +01:00
Steinar H. Gunderson ba47c8eeeb Merge commit 'ddd250b9d655117920dd65a973cea2f8b3c57fce' into cluster 2025-12-24 15:03:08 +01:00
Steinar H. Gunderson 6b6279098d Merge commit 'd47aa639bd614b37a59f87e6ab68496580f0cf3e' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 15:02:03 +01:00
Steinar H. Gunderson 2a1ed1267e Merge commit 'd3fc1d835e5144cc98d6a7658fb8cfd9370792f1' into cluster 2025-12-24 14:37:41 +01:00
Steinar H. Gunderson 8e509e240a Merge commit '432995ad82119070afa0bf720eb65d800bcbf817' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 13:57:03 +01:00
Steinar H. Gunderson 1b80a18fac Merge commit '4912f5b0b5f2656bc5fcdb0af480765ad5aa8932' into cluster 2025-12-24 13:55:47 +01:00
Steinar H. Gunderson ee41dc5c98 Merge commit '14f6eab07d1d1e1a59372974e5534128676e9440' into cluster 
This is the last commit before there are more conflicts.
 2025-12-24 13:51:24 +01:00
Steinar H. Gunderson f0793a2080 Merge commit '9032c6cbe74ccf7e8963755501e7e6cc473ae471' into cluster 
This is a rather involved merge, since the cluster changes interact
fairly badly with the refactoring we're merging:

The new code wants the search to know nothing at all about the UCI protocol,
it just calls a callback with some worker information (including a Position),
which then transforms that information into a InfoFull which is then sent
through another callback, upon which UCIEngine converts it to UCI and writes
it to stdout.

On the other hand, the MPI information wants to exchange PVs between workers
at this point, and it wants to use the UCI string as the primary medium of
exchange. Position is a lot of work to serialize, so we choose a middle road;
we capture the InfoFull by switching out the callback, serializes it, does the
MPI exchange on that, unserializes it and then continues with the print callback
(if there is new information).
 2025-12-24 13:50:14 +01:00
Steinar H. Gunderson a3cb287405 Merge commit '299707d2c2cbf1694bb21ed4a375b54ef35d719e' into cluster 2025-12-23 16:21:07 +01:00
Nonlinear2andJoost VandeVondele aff1f67997 simplify see pruning in qsearch 
passed non-regression STC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 34880 W: 9193 L: 8968 D: 16719
Ptnml(0-2): 103, 4047, 8935, 4232, 123
https://tests.stockfishchess.org/tests/view/66ee83bd86d5ee47d953b15b

passed non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 69126 W: 17529 L: 17357 D: 34240
Ptnml(0-2): 41, 7507, 19285, 7699, 31
https://tests.stockfishchess.org/tests/view/66ef3e0386d5ee47d953b1d3

closes https://github.com/official-stockfish/Stockfish/pull/5607

Bench: 1339840
 2024-09-28 17:22:33 +02:00
Joost VandeVondele ae420e735f Tweak Correction histories 
tune parameters some more, adjust scores updated for each history

passed STC:
https://tests.stockfishchess.org/tests/view/66ea569186d5ee47d953ae48
LLR: 2.92 (-2.94,2.94) <0.00,2.00>
Total: 36288 W: 9660 L: 9344 D: 17284
Ptnml(0-2): 110, 4207, 9220, 4471, 136

passed LTC:
https://tests.stockfishchess.org/tests/view/66ea9b4e86d5ee47d953ae6f
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 241446 W: 61748 L: 61010 D: 118688
Ptnml(0-2): 173, 26211, 67202, 26979, 158

closes https://github.com/official-stockfish/Stockfish/pull/5606

Bench: 1677953
 2024-09-28 17:17:44 +02:00
FauziAkramandJoost VandeVondele 5d0bb5976e Removed ROOK threatenedByPawn 
Passed STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 56608 W: 14788 L: 14588 D: 27232
Ptnml(0-2): 162, 6763, 14313, 6845, 221
https://tests.stockfishchess.org/tests/view/66e83f9c86d5ee47d953ab1d

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 175758 W: 44501 L: 44438 D: 86819
Ptnml(0-2): 125, 19489, 48601, 19526, 138
https://tests.stockfishchess.org/tests/view/66e882d486d5ee47d953ab8a

closes https://github.com/official-stockfish/Stockfish/pull/5601

bench: 1241271
 2024-09-28 17:17:14 +02:00
Wencey WangandJoost VandeVondele 93869d5d0a Fix native arch builds on loongarch64 
Adds support for LSX and LASX

closes https://github.com/official-stockfish/Stockfish/pull/5600

No functional change
 2024-09-28 17:12:12 +02:00
Shawn XuandDisservin 60351b9df9 Introduce Various Correction histories 
This patch introduces three additional correction histories, namely,
Major Piece Correction History, Minor Piece Correction History, and
Non-Pawn Correction History.

Introduced by @mcthouacbb in Sirius
(https://github.com/mcthouacbb/Sirius) chess engine. The Major Piece
Correction History is indexed by side-to-move and the Zobrist key
representing the position of the King, Rook, and Queen of both sides.
Likewise, the Minor Piece Correction History is indexed by side-to-move
and the Zobrist key representing the position of the King, Knight, and
Bishop of both sides.

Also See:
https://github.com/mcthouacbb/Sirius/commit/97b85bbaac88ff5a0f63e28776027dd3de77164e
https://github.com/mcthouacbb/Sirius/commit/3099cdef2f13e29805654b5f8153e6ecd5853195

Introduced by @zzzzz151 in Starzix (https://github.com/zzzzz151/Starzix)
chess engine. Non-Pawn correction history consists of side-to-move, side
of Zobrist key, and a Zobrist key representing of the position of all
non-pawn pieces of **one side**. The non-pawn correction values for both
key sides are then summed.

Also See:
https://github.com/zzzzz151/Starzix/commit/34911772f178c27b3a239dda0acb79c397c3a2f0
https://github.com/zzzzz151/Starzix/commit/33e0df8dd2db1d4775974ab12e3390154697f47a

The weights on the final correction value of the above correction
histories, as well as existing correction histories, are then tuned in
two separate SPSA sessions, totaling 75k games.

SPSA1:
https://tests.stockfishchess.org/tests/view/66e5243886d5ee47d953a86b
(Stopped early due to some weights reaching the maximum value)

SPSA2:
https://tests.stockfishchess.org/tests/view/66e6a26f86d5ee47d953a965

Also thanks to @martinnovaak, (Motor
https://github.com/martinnovaak/motor author) for insights and
suggestions.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 23328 W: 6197 L: 5901 D: 11230
Ptnml(0-2): 82, 2582, 6041, 2876, 83
https://tests.stockfishchess.org/tests/view/66e8787b86d5ee47d953ab6f

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 10626 W: 2826 L: 2560 D: 5240
Ptnml(0-2): 4, 1054, 2941, 1300, 14
https://tests.stockfishchess.org/tests/view/66e8ab2386d5ee47d953aba8

closes https://github.com/official-stockfish/Stockfish/pull/5598

Bench: 1011161
 2024-09-17 21:01:43 +02:00
Michael ChalyandDisservin 240a5b1c72 Introduce separate butterfly history table for sorting root moves 
Idea of this patch comes from the fact that current history heuristics
are mostly populated by low depth entries since our stat bonus reaches
maximum value at depth 5-6 and number of low depth nodes is much bigger
than number of high depth nodes. But it doesn't make a whole lost of
sense to use this low-depth centered histories to sort moves at root.
Current patch introduces special history table that is used exclusively
at root, it remembers which quiet moves were good and which quiet moves
were not good there and uses this information for move ordering.

Passed STC:
https://tests.stockfishchess.org/tests/view/66dda74adc53972b68218cc9
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 127680 W: 33579 L: 33126 D: 60975
Ptnml(0-2): 422, 15098, 32391, 15463, 466

Passed LTC:
https://tests.stockfishchess.org/tests/view/66dead2adc53972b68218d34
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 381978 W: 96958 L: 95923 D: 189097
Ptnml(0-2): 277, 42165, 105089, 43162, 296

closes https://github.com/official-stockfish/Stockfish/pull/5595

Bench: 1611283
 2024-09-17 20:54:02 +02:00
Shawn XuandDisservin 5ce7f866a5 Simplify Fail Low Bonus 
Passed Non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 302528 W: 78190 L: 78264 D: 146074
Ptnml(0-2): 1029, 35797, 77551, 35993, 894
https://tests.stockfishchess.org/tests/view/66dcebdedc53972b68218c7e

Passed Non-regression LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 122754 W: 31025 L: 30907 D: 60822
Ptnml(0-2): 74, 13597, 33908, 13733, 65
https://tests.stockfishchess.org/tests/view/66e0c38686d5ee47d953a481

closes https://github.com/official-stockfish/Stockfish/pull/5594

Bench: 1646373
 2024-09-17 20:50:30 +02:00
Muzhen GamingandDisservin 224c147bd6 VVLTC Search Tune 
Tuned with 115k games at VVLTC:
https://tests.stockfishchess.org/tests/view/66c80e09bf8c9d8780fda62a

Passed VVLTC 1st sprt:
https://tests.stockfishchess.org/tests/view/66d69ade9de3e7f9b33d14f9
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 54270 W: 13935 L: 13647 D: 26688
Ptnml(0-2): 2, 4907, 17032, 5189, 5

Passed VVLTC 2nd sprt:
https://tests.stockfishchess.org/tests/view/66dcf9c1dc53972b68218c84
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 136696 W: 34941 L: 34462 D: 67293
Ptnml(0-2): 8, 12659, 42535, 13138, 8

closes https://github.com/official-stockfish/Stockfish/pull/5592

Bench: 1644273
 2024-09-17 20:47:24 +02:00