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Author SHA1 Message Date
Steinar H. Gunderson 7ed6af120a Fix -Wunused-parameter warning. 
When compiling the cluster branch but in non-MPI mode, we'd get some
warnings in cluster.h about unused ThreadPool parameters.

No functional change.
 2026-01-02 09:29:38 +01:00
Steinar H. Gunderson d3a46e40b2 Update cluster copyright year. 
No functional change.
 2026-01-02 09:29:33 +01:00
Steinar H. Gunderson bd3fd8ba79 Extract bestMove and ponderMove after the PV. 
Extracting ponderMove may have the unintentional effect of extending the
PV by one move (which should not be displayed), so we need to extract it
after we've extracted the PV. We still need to both before the MPI exchange,
though.

Patch by vondele, merely committed by me.
 2026-01-02 09:24:56 +01:00
Steinar H. Gunderson 3d577337c2 Merge branch 'master' into cluster 2026-01-01 17:33:27 +01:00
Joost VandeVondele 28844fc697 Update of the year 
Happy New Year!

closes https://github.com/official-stockfish/Stockfish/pull/6514

No functional change
 2026-01-01 16:17:38 +01:00
mstemberaandJoost VandeVondele 8815d1ef02 Minor cleanup in full_threats.cpp 
closes https://github.com/official-stockfish/Stockfish/pull/6509

No functional change
 2026-01-01 16:13:44 +01:00
FauziAkramandJoost VandeVondele 5b9259e51f Replacing nested loops with a single range-based for loop 
closes https://github.com/official-stockfish/Stockfish/pull/6503

No functional change
 2026-01-01 16:12:35 +01:00
anematodeandJoost VandeVondele 593eeaf24c simplify find_nnz a bit 
This code path is never taken for vector sizes >= 512, so we can simplify it.

closes https://github.com/official-stockfish/Stockfish/pull/6501

No functional change
 2026-01-01 16:08:03 +01:00
ppigazziniandJoost VandeVondele 0317c6ccec build: rename WINE_PATH to RUN_PREFIX for wrapper execution 
WINE_PATH started as a Wine-specific knob, but it’s now used more generally
as a command prefix to run the built engine under wrappers
like Intel SDE, qemu-user, etc.

- Add RUN_PREFIX as the supported “run wrapper/prefix” variable in Makefile
- Set WINE_PATH as a deprecated alias
- Update CI and scripts to use RUN_PREFIX

closes https://github.com/official-stockfish/Stockfish/pull/6500

No functional change
 2026-01-01 16:06:25 +01:00
anematodeandJoost VandeVondele aeb3bf33a9 port get_changed_pieces to ARM NEON 
passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 71968 W: 18833 L: 18489 D: 34646
Ptnml(0-2): 192, 7310, 20643, 7640, 199
https://tests.stockfishchess.org/tests/view/69509e5c572093c1986d7a0a

closes https://github.com/official-stockfish/Stockfish/pull/6512

No functional change
 2026-01-01 16:04:43 +01:00
Michael ChalyandJoost VandeVondele ced9f69834 Adjust main history with every new root position 
this patch dampens down main history to 3/4 of it value for all possible moves
at the start of ID loop, making it partially refresh with every new root
position.

Passed STC:
https://tests.stockfishchess.org/tests/view/694e33ff572093c1986d7234
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 115520 W: 30164 L: 29735 D: 55621
Ptnml(0-2): 395, 13192, 30192, 13551, 430

Passed LTC:
https://tests.stockfishchess.org/tests/view/6950cbe6572093c1986d816c
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 63672 W: 16480 L: 16114 D: 31078
Ptnml(0-2): 46, 6524, 18329, 6892, 45

closes https://github.com/official-stockfish/Stockfish/pull/6504

bench 2710946
 2026-01-01 15:53:04 +01:00
Steinar H. GundersonandJoost VandeVondele 1453691496 Fix feature check 
Use _POSIX_C_SOURCE to check for PTHREAD_MUTEX_ROBUST support. The latter is a enum, not a defined variable.

closes https://github.com/official-stockfish/Stockfish/pull/6510

No functional change
 2026-01-01 15:52:01 +01:00
Joost VandeVondele e0fb783c30 Fix incorrect initialization 
Fixes https://github.com/official-stockfish/Stockfish/issues/6505

Missing initialization seemingly resulting in side effects, as discussed in the issue.

Credit to Sopel for spotting the bug.

PR used as a testcase for CoPilot, doing the right thing https://github.com/official-stockfish/Stockfish/pull/6478#discussion_r2655467218

closes https://github.com/official-stockfish/Stockfish/pull/6511

No functional change
 2026-01-01 15:51:09 +01:00
Timothy HerchenandDisservin 44d5467bbe Remove -Wstack-usage on (apple) clang 
Clang pretends to be GCC, but is enraged by `-Wstack-usage`:

closes https://github.com/official-stockfish/Stockfish/pull/6499

No functional change
 2025-12-28 14:59:26 +01:00
anematodeDisservinMichael Chaly
 		969285fa5d Shared pawn history 
[Passed STC SMP](https://tests.stockfishchess.org/tests/view/694e506c572093c1986d7276):
```
LLR: 2.97 (-2.94,2.94) <0.00,2.00>
Total: 14992 W: 3924 L: 3653 D: 7415
Ptnml(0-2): 20, 1547, 4090, 1820, 19
```

[Passed LTC SMP](https://tests.stockfishchess.org/tests/live_elo/694ead61572093c1986d7365):
```
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 41146 W: 10654 L: 10342 D: 20150
Ptnml(0-2): 17, 3999, 12225, 4319, 13
```

[Passed a sanity check STC SMP post-refactoring](https://tests.stockfishchess.org/tests/view/69503997572093c1986d763a):
```
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 46728 W: 12178 L: 11863 D: 22687
Ptnml(0-2): 82, 5093, 12685, 5436, 68
```

(The large gain of the first STC was probably a fluke, and this result
is more reasonable!)

After shared correction history, Viz suggested we try sharing other
histories, especially `pawnHistory`. As far as we're aware, sharing
history besides correction history (like Caissa does) is novel. The
implementation follows the same pattern as shared correction history –
the size of the history table is scaled with
`next_power_of_two(threadsInNumaNode)` and the entry is prefetched in
`do_move`.

A bit of refactoring was done to accommodate this new history. Note that
we prefetch `&history->pawn_entry(*this)[pc][to]` rather than
`&history->pawn_entry(*this)` because unlike the other entries, each
entry contains multiple cache lines.

closes https://github.com/official-stockfish/Stockfish/pull/6498

Bench: 2503391

Co-authored-by: Michael Chaly <Vizvezdenec@gmail.com>
 2025-12-28 14:59:09 +01:00
Stefan GeschwentnerandDisservin 1780c1fd6e For expected ALL nodes scale up reduction with depth dependent factor. 
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 141120 W: 36860 L: 36390 D: 67870
Ptnml(0-2): 470, 16441, 36314, 16819, 516
https://tests.stockfishchess.org/tests/view/694978e93c8768ca45072763

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 66576 W: 17078 L: 16700 D: 32798
Ptnml(0-2): 45, 7093, 18628, 7483, 39
https://tests.stockfishchess.org/tests/view/694bb608572093c1986d6ba6

closes https://github.com/official-stockfish/Stockfish/pull/6496

Bench: 2503391
 2025-12-28 14:55:55 +01:00
KazAppsandDisservin b2e60960b3 Fix nonPawnKey 
Fix incorrect nonPawnKey update

Passed non-reg SMP STC:
```
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 139424 W: 35792 L: 35690 D: 67942
Ptnml(0-2): 197, 15783, 37665, 15855, 212
```
https://tests.stockfishchess.org/tests/view/694b7b7e572093c1986d6b0d

Passed non-reg SMP LTC:
```
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 88880 W: 22863 L: 22718 D: 43299
Ptnml(0-2): 16, 8947, 26401, 9028, 48
```
https://tests.stockfishchess.org/tests/view/694d2ceb572093c1986d6fc8

fixes https://github.com/official-stockfish/Stockfish/issues/6492

closes https://github.com/official-stockfish/Stockfish/pull/6494

Bench: 2475788
 2025-12-28 14:55:47 +01:00
Daniel MonroeandDisservin 1047f844d1 Simplify doDeeperSearch 
Passed simplification STC
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 92096 W: 23888 L: 23728 D: 44480
Ptnml(0-2): 336, 10796, 23608, 10988, 320
https://tests.stockfishchess.org/tests/view/694b6b9d572093c1986d6ae0

Passed simplification LTC
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 50064 W: 12789 L: 12598 D: 24677
Ptnml(0-2): 24, 5350, 14103, 5521, 34
https://tests.stockfishchess.org/tests/view/694d49aa572093c1986d7021

closes https://github.com/official-stockfish/Stockfish/pull/6493

Bench: 2494221
 2025-12-28 14:53:12 +01:00
Joost VandeVondeleandDisservin 06819ad54c Update Top CPU Contributors 
update to current

closes https://github.com/official-stockfish/Stockfish/pull/6491

No functional change
 2025-12-28 14:51:56 +01:00
FauziAkramandDisservin 9d69577e19 Removing redundant parentheses 
closes https://github.com/official-stockfish/Stockfish/pull/6490

No functional change
 2025-12-28 14:50:36 +01:00
FauziAkramandDisservin cd3a837324 Refine reduction logic based on next-ply cutoff count 
Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 38208 W: 10076 L: 9754 D: 18378
Ptnml(0-2): 139, 4390, 9742, 4676, 157
https://tests.stockfishchess.org/tests/view/6945bb6446f342e1ec211d93

Passed LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 64086 W: 16529 L: 16157 D: 31400
Ptnml(0-2): 34, 6808, 17990, 7174, 37
https://tests.stockfishchess.org/tests/view/69479d303c8768ca45072446

closes https://github.com/official-stockfish/Stockfish/pull/6489

Bench: 2442415
 2025-12-28 14:49:19 +01:00
Steinar H. Gunderson bbdab9889a Unbreak MPI compilation. 
3c2c7b01bd deleted the TTCache default constructor, but we need it
when MPI is active. This wasn't discovered during the merging,
and it is hard to put it properly into the commit history due to
rebase/rerere shortcomings. (This means that some of the merge
commits will not compile with MPI on, and this patch needs to be
added on top if bisecting.)
 2025-12-26 23:20:44 +01:00
Steinar H. Gunderson 1b3830fad4 Merge commit 'c467fe5ba42545827d769c360aa404767308ac18' into cluster 2025-12-25 20:22:33 +01:00
Steinar H. Gunderson bf5f8c5543 Merge commit '5297ba0a1a1aa0a15332e0d64ce6b32952342cac' into cluster 2025-12-25 20:22:26 +01:00
Steinar H. Gunderson 0bcfc6c651 Merge commit 'abd835dcbc3a28481224f6253b00b7420d062513' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:19:41 +01:00
Steinar H. Gunderson a8f8f97eb1 Merge commit '8e5392d79a36aba5b997cf6fb590937e3e624e80' into cluster 2025-12-25 20:19:19 +01:00
Steinar H. Gunderson 8cc99e1314 Merge commit '69a01b88f35db2a5003d42116f573207ca5c275b' into cluster 2025-12-25 20:16:11 +01:00
Steinar H. Gunderson bfc8c24999 Merge commit 'bc9f08731f10896a306bcc34e30e5606087af79a' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:13:41 +01:00
Steinar H. Gunderson 8b776c3f04 Merge commit '75edbee01e6f8cb53a2555499192ccaddb883577' into cluster 2025-12-25 20:13:34 +01:00
Steinar H. Gunderson 725acd7449 Merge commit '315f8ba4bf7d846b35f984d5e6040c14a512d9b9' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:12:54 +01:00
Steinar H. Gunderson f5a171d82e Merge commit 'e2aa1255707628aa1d70f13c88211724e34fa38e' into cluster 2025-12-25 20:12:35 +01:00
Steinar H. Gunderson b5c4fd2b7a Merge commit '8c2d21f91a5840a67c36267e5043070ffad06860' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:08:43 +01:00
Steinar H. Gunderson e1f2a899b7 Merge commit 'd2d046c2a497b2d70debde07ccc414ca633d550b' into cluster 2025-12-25 20:07:02 +01:00
Steinar H. Gunderson f44f4f356c Merge commit '44efbaddea909e146c6c41afaf458da8c9e4b4e4' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:03:12 +01:00
Steinar H. Gunderson 20d5986235 Merge commit 'd7c04a942950f1fe3f655bf8b608e8ef21c07628' into cluster 2025-12-25 20:03:00 +01:00
Steinar H. Gunderson ab03e55a60 Merge commit 'd942e13398aa5de55224c7d81bfad6b0f5b9e488' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:02:14 +01:00
Steinar H. Gunderson 7c50916a9d Merge commit '291a429cdd54f5298b8dc3d19cd08c3a64de4d10' into cluster 2025-12-25 20:02:02 +01:00
Steinar H. Gunderson 60f5e6c211 Merge commit '43b2d65d7275b11fd47c7225f8a0d19afbab4cd1' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 20:01:02 +01:00
Steinar H. Gunderson 0eb376ce8d Merge commit 'f00d91f8ac72de8d201f8b50968bb66b1235dc9a' into cluster 2025-12-25 20:00:51 +01:00
Steinar H. Gunderson 6653af1549 Merge commit '738ac2a10025ca58198e3d2d7f0bc70d83c2cb7f' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 19:59:45 +01:00
Steinar H. Gunderson 4662a58e1d Merge commit '28c07fb456855c4e082571ed7dd723a3e71fdcff' into cluster 2025-12-25 19:59:29 +01:00
Steinar H. Gunderson 21d7128260 Merge commit 'ea71a088435d4f1e51433c0a321f2afdff7814b1' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 19:58:36 +01:00
Steinar H. Gunderson 75dd7d80ba Merge commit 'f414d490bc0e4013c211a066623f313883f49106' into cluster 2025-12-25 19:53:08 +01:00
Steinar H. Gunderson 8a6a8e8a42 Merge commit 'b822fdf2f2f00758c794cb61a25a044424d2bc0a' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 19:50:17 +01:00
Steinar H. Gunderson 03732aa685 Merge commit '57e06be71f0177a69843750a9f456462d02f23b9' into cluster 2025-12-25 17:57:11 +01:00
Steinar H. Gunderson f2643877eb Merge commit '70bb317afe870c8bc1979ef955f120e4d81f504e' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 17:33:17 +01:00
Steinar H. Gunderson a5ea0b2b2b Merge commit 'c2611efe5c317969b583a5ff81352439f905e722' into cluster 2025-12-25 17:32:39 +01:00
Steinar H. Gunderson 110fdc486a Merge commit '16fee2a7da25c6d0267930eb9677862cb1f009c7' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 17:30:06 +01:00
Steinar H. Gunderson b3580e942d Merge commit 'c15113554f53890d7944c00a70d0f2d8a78916fb' into cluster 2025-12-25 17:26:35 +01:00
Steinar H. Gunderson 5d3f71f72d Merge commit '2ce47573b4d3664dca4cbc4354c8c600540d16ad' into cluster 
This is the last commit before there are more conflicts.
 2025-12-25 17:22:27 +01:00