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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
Joost VandeVondele b01fdb596a Fix upperbound/lowerbound output in multithreaded case 
In case a stop is received during multithreaded searches, the PV of the best
thread might be printed without the correct upperbound/lowerbound indicators.
This was due to the pvIdx variable being incremented after receiving the stop.

passed STC:
https://tests.stockfishchess.org/tests/view/666985da602682471b064d08
 LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 196576 W: 51039 L: 50996 D: 94541
Ptnml(0-2): 760, 22545, 51603, 22652, 728

closes https://github.com/official-stockfish/Stockfish/pull/5391

Bench: 1160467
 2024-06-15 12:08:29 +02:00
Joost VandeVondele 44cddbd962 Add matetrack to CI 
verifies that all mate PVs printed for finished iterations (i.e. no lower or upper bounds),
are complete, i.e. of the expected length and ending in mate, and do not contain drawing
or illegal moves.

based on a set of 2000 positions and the code in https://github.com/vondele/matetrack

closes https://github.com/official-stockfish/Stockfish/pull/5390

No functional change
 2024-06-15 12:06:45 +02:00
Tomasz SobczykandJoost VandeVondele 7c0607d2d3 Fix printing of empty info strings. 
Handle printing of `info string` in a single place.

Fixes #5386

closes https://github.com/official-stockfish/Stockfish/pull/5387

No functional change
 2024-06-15 12:04:16 +02:00
Joost VandeVondele 3d92950859 Limit depth after extensions to avoid asserts. 
currently extensions can cause depth to exceed MAX_PLY.

This triggers the assert near line 542 in search when running a binary compiled with `debug=yes` on a testcase like:
```
position fen 7K/P1p1p1p1/2P1P1Pk/6pP/3p2P1/1P6/3P4/8 w - - 0 1
go nodes 1000000
```

passed STC
https://tests.stockfishchess.org/tests/view/6668a56a602682471b064c8d
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 143936 W: 37338 L: 37238 D: 69360
Ptnml(0-2): 514, 16335, 38149, 16477, 493

closes https://github.com/official-stockfish/Stockfish/pull/5383

Bench: 1160467
 2024-06-15 12:02:56 +02:00
DubslowandJoost VandeVondele c8213ba0d0 Simplify TT interface and avoid changing TT info 
This commit builds on the work and ideas of #5345, #5348, and #5364.

Place as much as possible of the TT implementation in tt.cpp, rather than in the
header.  Some commentary is added to better document the public interface.

Fix the search read-TT races, or at least contain them to within TT methods only.

Passed SMP STC: https://tests.stockfishchess.org/tests/view/666134ab91e372763104b443
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 512552 W: 132387 L: 132676 D: 247489
Ptnml(0-2): 469, 58429, 138771, 58136, 471

The unmerged version has bench identical to the other PR (see also #5348) and
therefore those same-functionality tests:

SMP LTC: https://tests.stockfishchess.org/tests/view/665c7021fd45fb0f907c214a
SMP LTC: https://tests.stockfishchess.org/tests/view/665d28a7fd45fb0f907c5495

closes https://github.com/official-stockfish/Stockfish/pull/5369

bench 1205675
 2024-06-12 09:17:04 +02:00
Linmiao XuandJoost VandeVondele 025da6a0d1 Give positional output more weight in nnue eval 
This effectively reverts the removal of delta in:
https://github.com/official-stockfish/Stockfish/pull/5373

Passed STC:
https://tests.stockfishchess.org/tests/view/6664d41922234461cef58e6b
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 56448 W: 14849 L: 14500 D: 27099
Ptnml(0-2): 227, 6481, 14457, 6834, 225

Passed LTC:
https://tests.stockfishchess.org/tests/view/666587a1996b40829f4ee007
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 91686 W: 23402 L: 22963 D: 45321
Ptnml(0-2): 78, 10205, 24840, 10640, 80

closes https://github.com/official-stockfish/Stockfish/pull/5382

bench 1160467
 2024-06-12 09:17:04 +02:00
DisservinandJoost VandeVondele 7013a22b74 Move options into the engine 
Move the engine options into the engine class, also avoid duplicated
initializations after startup.  UCIEngine needs to register an add_listener to
listen to all option changes and print these.  Also avoid a double
initialization of the TT, which was the case with the old state.

closes https://github.com/official-stockfish/Stockfish/pull/5356

No functional change
 2024-06-12 09:17:04 +02:00
Joost VandeVondele 7e890fd048 Keep mate PVs intact. 
do not return a cutoff value in razoring if that value is in the mate/tb range.

passed STC:
https://tests.stockfishchess.org/tests/view/666381880ff7cb4868d1fe58
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 130848 W: 34046 L: 33931 D: 62871
Ptnml(0-2): 429, 14968, 34524, 15065, 438

passed LTC:
https://tests.stockfishchess.org/tests/view/66643f120612cd151f9e7788
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 39702 W: 10157 L: 9959 D: 19586
Ptnml(0-2): 20, 4108, 11402, 4296, 25

closes https://github.com/official-stockfish/Stockfish/pull/5379

Bench: 1174094
 2024-06-12 09:03:32 +02:00
cj5716andDisservin e271059e08 Make repeated bench runs identical 
fixes https://github.com/official-stockfish/Stockfish/issues/5376
closes https://github.com/official-stockfish/Stockfish/pull/5377

No functional changes
 2024-06-08 23:40:22 +02:00
evqsxandDisservin 4151c06b74 Remove the correction history bonus in null move search 
Passed STC:
https://tests.stockfishchess.org/tests/view/666168e191e372763104c664
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 94848 W: 24708 L: 24550 D: 45590
Ptnml(0-2): 289, 11355, 24033, 11403, 344

Passed LTC:
https://tests.stockfishchess.org/tests/view/6661e73591e372763104c751
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 70452 W: 17849 L: 17679 D: 34924
Ptnml(0-2): 27, 7707, 19596, 7861, 35

closes https://github.com/official-stockfish/Stockfish/pull/5375

Bench: 1174094
 2024-06-08 23:39:46 +02:00
DubslowandDisservin 1c67b46caf Linearize corrHist 
Passed STC: https://tests.stockfishchess.org/tests/view/6661fff88dd8f31ed3c5d819
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 17504 W: 4651 L: 4406 D: 8447
Ptnml(0-2): 71, 1975, 4384, 2282, 40

Passed LTC: https://tests.stockfishchess.org/tests/view/666205b48dd8f31ed3c61296
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 24522 W: 6313 L: 6094 D: 12115
Ptnml(0-2): 14, 2643, 6726, 2866, 12

closes https://github.com/official-stockfish/Stockfish/pull/5374

Bench: 1237729
 2024-06-08 23:35:00 +02:00
DubslowandDisservin 7d4ffa175c Remove delta from evaluation 
Passed STC: https://tests.stockfishchess.org/tests/view/6660e49c6489614cdad14e29
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 188768 W: 48907 L: 48854 D: 91007
Ptnml(0-2): 584, 22571, 48005, 22656, 568

Passed LTC: https://tests.stockfishchess.org/tests/view/6660ff9791e372763104b38c
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 310680 W: 78651 L: 78727 D: 153302
Ptnml(0-2): 180, 34818, 85433, 34716, 193

closes https://github.com/official-stockfish/Stockfish/pull/5373

Bench: 1214575
 2024-06-08 23:34:03 +02:00
Tomasz SobczykandDisservin f55239b2f3 NumaPolicy fixes and robustness improvements 
1. Fix GetProcessGroupAffinity still not getting properly aligned memory
   sometimes.
2. Fix a very theoretically possible heap corruption if
   GetActiveProcessorGroupCount changes between calls.
3. Fully determine affinity on Windows 11 and Windows Server 2022. It
   should only ever be indeterminate in case of an error.
4. Separate isDeterminate for old and new API, as they are &'d together
   we still can end up with a subset of processors even if one API is
   indeterminate.
5. likely_used_old_api() that is based on actual affinity that's been
   detected
6. IMPORTANT: Gather affinities at startup, so that we only later use
   the affinites set at startup. Not only does this prevent us from our
   own calls interfering with detection but it also means subsequent
   setoption NumaPolicy calls should behave as expected.
7. Fix ERROR_INSUFFICIENT_BUFFER from GetThreadSelectedCpuSetMasks being
   treated like an error.

Should resolve
https://github.com/vondele/Stockfish/commit/02ff76630b358e5f958793cc93df0009d2da65a5#commitcomment-142790025

closes https://github.com/official-stockfish/Stockfish/pull/5372

Bench: 1231853
 2024-06-08 23:32:27 +02:00
FauziAkramandDisservin e2be0aaf67 Tweak pruning formula 
Tweak pruning formula, including a constant. I started from an old
yellow patch, if I'm not mistaken by Viz (Unfortunately I lost the link)
where he tried something similar.
I worked on it, trying different variations, until I came up with a good
configuration to pass.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 213120 W: 55351 L: 54778 D: 102991
Ptnml(0-2): 572, 25209, 54437, 25758, 584
https://tests.stockfishchess.org/tests/view/6660c9a7c340c8eed7758195

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 315324 W: 80176 L: 79284 D: 155864
Ptnml(0-2): 155, 34711, 87030, 35619, 147
https://tests.stockfishchess.org/tests/view/6660d7bb6489614cdad13d66

closes https://github.com/official-stockfish/Stockfish/pull/5370

Bench: 1231853
 2024-06-08 23:28:07 +02:00
rn5f107s2andDisservin 5dda4037c7 Simplify razor changes 
Remove razoring changes from
https://github.com/official-stockfish/Stockfish/pull/5360

The mentioned patch introduced the usage of futility_margin into
razoring alongside a tune to futility_margin. It seems the elo gained in
this patch comes from the tune of futility_margin and not the
introduction of futility_margin to razoring, so simplify it away here.

Passed Non-regression STC:
https://tests.stockfishchess.org/tests/view/66606581c340c8eed7757bc8
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 169056 W: 43922 L: 43848 D: 81286
Ptnml(0-2): 438, 20288, 43034, 20298, 470

Passed Non-regression LTC:
https://tests.stockfishchess.org/tests/view/66607764c340c8eed7757c58
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 157134 W: 39805 L: 39723 D: 77606
Ptnml(0-2): 74, 17444, 43461, 17502, 86

Passed rebased Non-regression LTC:
https://tests.stockfishchess.org/tests/view/6660c696c340c8eed77580c0
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 135984 W: 34427 L: 34324 D: 67233
Ptnml(0-2): 67, 15063, 37615, 15194, 53

closes https://github.com/official-stockfish/Stockfish/pull/5366

Bench: 1150518
 2024-06-08 23:10:59 +02:00
Disservin 66ed4312f2 Workaround the clang-format inconsistencies 
closes https://github.com/official-stockfish/Stockfish/pull/5378

No functional change
 2024-06-08 23:09:02 +02:00
R-GocandDisservin e6c83beed1 Change PGO type for clang 
Change type of PGO in clang to IR which is recommended by LLVM/clang and
could result in a speedup.
https://github.com/llvm/llvm-project/issues/45668

closes https://github.com/official-stockfish/Stockfish/pull/5355

No functional change
 2024-06-08 23:05:56 +02:00
cj5716andJoost VandeVondele 5688b188cc Simplify evaluation constants 
Passed STC (<0, 2> by accident):
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 346016 W: 89529 L: 88756 D: 167731
Ptnml(0-2): 1012, 41074, 88027, 41919, 976
https://tests.stockfishchess.org/tests/view/6659d6ecf426908fcc6b6929

Passed LTC:
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 89862 W: 22887 L: 22734 D: 44241
Ptnml(0-2): 45, 9999, 24694, 10144, 49
https://tests.stockfishchess.org/tests/view/665a6ebb062b2c3cf814fde8

Passed LTC (Rebased):
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 325500 W: 82734 L: 82826 D: 159940
Ptnml(0-2): 193, 36409, 89665, 36263, 220
https://tests.stockfishchess.org/tests/view/665bd39f44e8416a9cdc1909

closes https://github.com/official-stockfish/Stockfish/pull/5361

Bench 961982
 2024-06-05 21:49:29 +02:00
DisservinandJoost VandeVondele fb18caae7a Update clang-format to version 18 
clang-format-18 is available in ubuntu noble(24.04), if you are on
a version lower than that you can use the update script from llvm.
https://apt.llvm.org/

Windows users should be able to download and use clang-format from
their release builds https://github.com/llvm/llvm-project/releases
or get the latest from msys2
https://packages.msys2.org/package/mingw-w64-x86_64-clang.

macOS users can resort to "brew install clang-format".

closes https://github.com/official-stockfish/Stockfish/pull/5365

No functional change
 2024-06-05 21:41:43 +02:00
Viren6andJoost VandeVondele 36eb9bc783 Use futility margin in razoring margin 
Uses futilityMargin * depth to set the razoring margin. This retains the
quadratic depth scaling to preserve mate finding capabilities. This patch is
nice because it increases the elo sensitivity of the futility margin
heuristics.

Passed STC:
https://tests.stockfishchess.org/tests/view/665f9892fd11ae7170b4849c
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 39392 W: 10348 L: 10030 D: 19014
Ptnml(0-2): 99, 4585, 10009, 4905, 98

Passed LTC:
https://tests.stockfishchess.org/tests/view/665f9d2dfd11ae7170b484a8
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 107910 W: 27521 L: 27053 D: 53336
Ptnml(0-2): 73, 11835, 29670, 12305, 72

closes https://github.com/official-stockfish/Stockfish/pull/5360

bench 1277173
 2024-06-05 21:33:46 +02:00
Muzhen GamingandJoost VandeVondele a08fcacb28 VVLTC search tune 
Parameters were tuned with 199k games of VVLTC: https://tests.stockfishchess.org/tests/view/665c67e73542f91ad1c54fe2

Passed VVLTC 1st sprt: https://tests.stockfishchess.org/tests/view/665e9c83fd45fb0f907c837c
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 83494 W: 21546 L: 21219 D: 40729
Ptnml(0-2): 6, 7707, 25993, 8036, 5

Passed VVLTC 2nd sprt: https://tests.stockfishchess.org/tests/view/665f650bfd45fb0f907cb360
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 151056 W: 38796 L: 38295 D: 73965
Ptnml(0-2): 5, 13742, 47536, 14237, 8

https://github.com/official-stockfish/Stockfish/pull/5359

Bench: 1154524
 2024-06-05 21:10:55 +02:00
mstemberaandJoost VandeVondele 21ba32af6d Remove m512_hadd128x16_interleave() 
This functionality is no longer used anywhere.

closes https://github.com/official-stockfish/Stockfish/pull/5357

No functional change
 2024-06-05 21:07:07 +02:00
Tomasz SobczykandJoost VandeVondele 02ff76630b Add NumaPolicy "hardware" option that bypasses current processor affinity. 
Can be used in case a GUI (e.g. ChessBase 17 see #5307) sets affinity to a
single processor group, but the user would like to use the full capabilities of
the hardware.  Improves affinity handling on Windows in case of multiple
available APIs and existing affinities.

closes https://github.com/official-stockfish/Stockfish/pull/5353

No functional change
 2024-06-05 21:01:45 +02:00
Gahtan NahdiandJoost VandeVondele daaccd9fc9 Simplify smallnet threshold 
remove pawncount

Passed STC non-reg:
https://tests.stockfishchess.org/tests/view/665e4548fd45fb0f907c80d5
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 60896 W: 15710 L: 15518 D: 29668
Ptnml(0-2): 149, 7145, 15660, 7353, 141

Passed LTC non-reg:
https://tests.stockfishchess.org/tests/view/665e4c52fd45fb0f907c815f
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 58068 W: 14773 L: 14590 D: 28705
Ptnml(0-2): 16, 6368, 16090, 6537, 23

closes https://github.com/official-stockfish/Stockfish/pull/5349

Bench: 1343156
 2024-06-05 20:59:56 +02:00