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No longer used in a meaningful way. Improve comments. Closes official-stockfish#4688 No functional change
Explicitly describe the architecture as deprecated, it remains available as its current alias x86-64-sse41-popcnt CPUs that support just this instruction set are now years old, any few years old Intel or AMD CPU supports x86-64-avx2. However, naming things 'modern' doesn't age well, so instead use explicit names. Adjust CI accordingly. Wiki, fishtest, downloader done as well. closes official-stockfish#4691 No functional change.
allows for building x86-64-avx2 and x86-64-bmi2 binaries for mac install coreutils show hardware capabilities as seen by the compilers move some tests from sse41 to avx2 as platforms support it closes official-stockfish#4692 No functional change
no longer used closes official-stockfish#4694 No functional change
No longer used closes official-stockfish#4695 No functional change
add CI tooling to detect security bugs. closes official-stockfish#4659 No functional change
closes official-stockfish#4696 No functional change
closes official-stockfish#4698 No functional change
This is somewhat similar to IIR for cutnodes but instead of reducing depth for cutnodes that don't have tt move we reduce margin multiplier in futility pruning for cutnodes that are not in TT. Passed STC: https://tests.stockfishchess.org/tests/view/64b244b90cdec37b95734c5b LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 75552 W: 19404 L: 19029 D: 37119 Ptnml(0-2): 233, 8806, 19378, 9071, 288 Passed LTC: https://tests.stockfishchess.org/tests/view/64b3ae5a0cdec37b95736516 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 104988 W: 27152 L: 26697 D: 51139 Ptnml(0-2): 41, 11259, 29446, 11700, 48 closes official-stockfish#4700 bench 1727577
This patch changes the frequency with which the time is checked, changing frequency from every 1024 counted nodes to every 512 counted nodes. The master value was tuned for the old classical eval, the patch takes the roughly 2x slowdown in nps with SFNNUEv7 into account. This could reduce a bit the losses on time on fishtest, but they are probably unrelated. passed STC: https://tests.stockfishchess.org/tests/view/64bb8ae5dc56e1650abb1b11 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 76576 W: 19677 L: 19501 D: 37398 Ptnml(0-2): 274, 8592, 20396, 8736, 290 closes official-stockfish#4704 No functional change
Use the assert which ensures that beta == alpha+1 at PVNodes to simplify a little bit the conditions further down in the code. passed STC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 56160 W: 14370 L: 14173 D: 27617 Ptnml(0-2): 210, 6192, 15076, 6395, 207 https://tests.stockfishchess.org/tests/view/64bc769cdc56e1650abb2e26 closes https://tests.stockfishchess.org/tests/view/64bc769cdc56e1650abb2e26 No functional change
Remove the exact bound condition from TT depth check. STC: https://tests.stockfishchess.org/tests/view/64b30b320cdec37b957359e9 LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 332928 W: 84895 L: 85003 D: 163030 Ptnml(0-2): 1242, 39200, 85604, 39260, 1158 LTC: https://tests.stockfishchess.org/tests/view/64b74e2adc56e1650abac0b6 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 92946 W: 23628 L: 23482 D: 45836 Ptnml(0-2): 38, 10033, 26192, 10165, 45 closes official-stockfish#4702 Bench: 1601764
Zobrist::noPawns is no longer used. closes official-stockfish#4344 no functional change
Simplify away the ttValue <= alpha extension in the multicut block. Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 318336 W: 81307 L: 81398 D: 155631 Ptnml(0-2): 1088, 37291, 82469, 37264, 1056 https://tests.stockfishchess.org/tests/view/64b8589fdc56e1650abad61d Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 89388 W: 22925 L: 22775 D: 43688 Ptnml(0-2): 34, 9635, 25210, 9777, 38 https://tests.stockfishchess.org/tests/view/64bc41d0dc56e1650abb29cb closes official-stockfish#4709 bench: 1604592
Also make two get_weight_index() static methods constexpr, for consistency with the other static get_hash_value() method right above. Tested for speed by user Torom (thanks). closes official-stockfish#4708 No functional change
- clarify the examples for the bench command - typo in search.cpp closes official-stockfish#4710 No functional change
The original idea is the reverse of a previous patch [1] which added bonuses in our move picker to moves escaping threats. In this patch, in addition to bonuses for evading threats, we apply penalties to moves moving to threatened squares. Further tweaks of that basic idea resulted in this specific version which further increases the penalty of moves moving to squares threatend depending on the piece threatening it. So for example a queen moving to a square attacked by a pawn would receive a larger penalty than a queen moving to square attacked by a rook. [1]: official-stockfish@08e0f52 -------- Passed STC: https://tests.stockfishchess.org/tests/live_elo/64c11269dc56e1650abb935d LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 95552 W: 24654 L: 24250 D: 46648 Ptnml(0-2): 322, 11098, 24562, 11442, 352 Passed LTC: https://tests.stockfishchess.org/tests/live_elo/64c2004ddc56e1650abba8b3 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 190230 W: 48806 L: 48178 D: 93246 Ptnml(0-2): 90, 20439, 53453, 21019, 114 ------- closes official-stockfish#4711 Bench: 1350831
closes official-stockfish#4712 No functional change
Add CPU archs: armv8-dotprod, riscv64 and ppc64le. The last two archs are built using QEMU multiarch docker container. References: https://docs.docker.com/build/building/multi-platform/ https://github.com/docker/setup-buildx-action https://github.com/docker/setup-qemu-action https://github.com/tonistiigi/binfmt https://stackoverflow.com/questions/72444103/what-does-running-the-multiarch-qemu-user-static-does-before-building-a-containe closes official-stockfish#4718 No functional change
Implements AffineTransformSparseInput layer for the NNUE evaluation for the armv8 and armv8-dotprod architectures. We measured some nice speed improvements via 10 runs of our benchmark: armv8, Cortex-X1 : 18.5% speed-up armv8, Cortex-A76 : 13.2% speed-up armv8-dotprod, Cortex-X1 : 27.1% speed-up armv8-dotprod, Cortex-A76 : 12.1% speed-up armv8, Cortex-A72, Raspberry Pi 4 : 8.2% speed-up (thanks Torom!) closes official-stockfish#4719 No functional change
Based on vondele's deletepsqt branch: vondele@369f5b051 This huge simplification uses a weighted material differences instead of the positional piece square tables (psqt) in the semi-classical complexity calculation. Tuned weights using spsa at 45+0.45 with: int pawnMult = 100; int knightMult = 325; int bishopMult = 350; int rookMult = 500; int queenMult = 900; TUNE(SetRange(0, 200), pawnMult); TUNE(SetRange(0, 650), knightMult); TUNE(SetRange(0, 700), bishopMult); TUNE(SetRange(200, 800), rookMult); TUNE(SetRange(600, 1200), queenMult); The values obtained via this tuning session were for a model where the psqt replacement formula was always from the point of view of White, even if the side to move was Black. We re-used the same values for an implementation with a psqt replacement from the point of view of the side to move, testing the result both on our standard book on positions with a strong White bias, and an alternate book with positions with a strong Black bias. We note that with the patch the last use of the venerable "Score" type disappears in Stockfish codebase (the Score type was used in classical evaluation to get a tampered eval interpolating values smoothly from the early midgame stage to the endgame stage). We leave it to another commit to clean all occurrences of Score in the code and the comments. ------- Passed non-regression LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 142542 W: 36264 L: 36168 D: 70110 Ptnml(0-2): 76, 15578, 39856, 15696, 65 https://tests.stockfishchess.org/tests/view/64c8cb495b17f7c21c0cf9f8 Passed non-regression LTC (with a book with Black bias): https://tests.stockfishchess.org/tests/view/64c8f9295b17f7c21c0cfdaf LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 494814 W: 125565 L: 125827 D: 243422 Ptnml(0-2): 244, 53926, 139346, 53630, 261 ------ closes official-stockfish#4713 Bench: 1655985
Simplify the "Prune moves with negative SEE" formula, by removing one multiplication and subtraction operation. Passed STC: LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 214272 W: 54596 L: 54572 D: 105104 Ptnml(0-2): 741, 25160, 55320, 25164, 751 https://tests.stockfishchess.org/tests/view/64c430d1dc56e1650abbdbf6 Passed LTC: LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 238380 W: 60600 L: 60601 D: 117179 Ptnml(0-2): 132, 26069, 66791, 26064, 134 https://tests.stockfishchess.org/tests/view/64c81f155b17f7c21c0cee2b closes official-stockfish#4721 bench: 1655337
Current master used value from transposition table there if it existed, this patch uses minimum between this tt value and the static eval instead (this thus is closer to the main search function, which uses the static eval). Passed STC: https://tests.stockfishchess.org/tests/view/64cd57285b17f7c21c0d6a8c LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 252544 W: 64671 L: 64039 D: 123834 Ptnml(0-2): 839, 29207, 65575, 29785, 866 Passed LTC: https://tests.stockfishchess.org/tests/view/64cf6c915b17f7c21c0d9fcb LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 60150 W: 15374 L: 15012 D: 29764 Ptnml(0-2): 24, 6321, 17024, 6681, 25 closes official-stockfish#4725 Bench: 1573024
Score is obsolete with the removal of psqt. No functional change. Signed-off-by: Cody Ho <[email protected]> closes official-stockfish#4724
If an incorrect network file is present at the start of the compilation stage, the Makefile script now correctly removes it before trying to download a clean version. closes official-stockfish#4726 No functional change
a) Add further tests to CI to cover most features. This uncovered a potential race in case setoption was sent between two searches. As the UCI protocol requires this sent to be went the engine is not searching, setoption now ensures that this is the case. b) Remove some unused code closes official-stockfish#4730 No functional change
might fix the tsan errors closes official-stockfish#4745 No functional change
…ficial-stockfish#4744 Current master gives this type of bonuses to continuation history, this patch also gives them to main history. Passed STC: https://tests.stockfishchess.org/tests/view/64d4802a5b17f7c21c0e27b3 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 480768 W: 122767 L: 121798 D: 236203 Ptnml(0-2): 1563, 56190, 123834, 57309, 1488 Passed LTC: https://tests.stockfishchess.org/tests/view/64d7e4c05b17f7c21c0e7456 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 32052 W: 8329 L: 8022 D: 15701 Ptnml(0-2): 19, 3335, 9015, 3634, 23 closes official-stockfish#4744 Bench: 1711793
As the negative extension term has sensitive scaling, it would make more sense to allow more negative extension also at lower depth, and not just a region between low and high depth. Passed STC: LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 124096 W: 31611 L: 31485 D: 61000 Ptnml(0-2): 422, 14437, 32205, 14561, 423 https://tests.stockfishchess.org/tests/view/64d205d75b17f7c21c0dea82 Passed LTC: LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 387882 W: 97840 L: 97993 D: 192049 Ptnml(0-2): 198, 42004, 109668, 41895, 176 https://tests.stockfishchess.org/tests/view/64d333f85b17f7c21c0e06c6 closes official-stockfish#4743 Bench: 1542357
Passed STC: https://tests.stockfishchess.org/tests/view/64d495995b17f7c21c0e29ed LLR: 2.95 (-2.94,2.94) <0.00,2.00> Total: 340288 W: 86664 L: 85910 D: 167714 Ptnml(0-2): 1030, 38855, 89697, 39455, 1107 Passed LTC: https://tests.stockfishchess.org/tests/view/64d5e1085b17f7c21c0e4ab5 LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 193230 W: 49235 L: 48606 D: 95389 Ptnml(0-2): 98, 20432, 54921, 21071, 93 closes official-stockfish#4742 Bench: 1579576
With the recent introduction of the dual NNUE, the need for simple eval is no longer there. Passed STC: https://tests.stockfishchess.org/tests/view/65c1f735c865510db0281652 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 85312 W: 22009 L: 21837 D: 41466 Ptnml(0-2): 334, 10155, 21567, 10205, 395 Passed LTC: https://tests.stockfishchess.org/tests/view/65c2d64bc865510db0282810 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 49956 W: 12596 L: 12402 D: 24958 Ptnml(0-2): 28, 5553, 13624, 5743, 30 closes official-stockfish#5037 Bench 1213676
This removes the reduction decrease that occured when the previous ply had a movecount greater than 7. Passed STC: https://tests.stockfishchess.org/tests/view/65c3f6dac865510db0283ef6 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 11968 W: 3205 L: 2953 D: 5810 Ptnml(0-2): 38, 1310, 3064, 1506, 66 Passed LTC: https://tests.stockfishchess.org/tests/view/65c42377c865510db0284217 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 35676 W: 9113 L: 8905 D: 17658 Ptnml(0-2): 22, 3893, 9802, 4097, 24 closes official-stockfish#5040 Bench: 1148379
Passed simplification STC: https://tests.stockfishchess.org/tests/view/65c38d2ac865510db02836cf LLR: 2.93 (-2.94,2.94) <-1.75,0.25> Total: 52288 W: 13578 L: 13371 D: 25339 Ptnml(0-2): 197, 6171, 13265, 6250, 261 Passed simplification LTC: https://tests.stockfishchess.org/tests/view/65c4470ec865510db0284473 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 44958 W: 11255 L: 11055 D: 22648 Ptnml(0-2): 37, 4962, 12274, 5176, 30 closes official-stockfish#5041 Bench: 1116591
Fixes the issue mentioned in official-stockfish@584d9ef#r138417600. Thanks to @cj5716 and @peregrineshahin for spotting this! closes official-stockfish#5042 No functional change
- Update codeql to v3 - Switch from dev-drprasad to native github cli - Update softprops/action-gh-release to node 20 commit `thollander/actions-comment-pull-request` needs to be bumped to node20 too, but the author hasnt done so atm closes official-stockfish#5044 No functional change
In both search and qsearch, there are instances where we do unadjustedStaticEval = ss->staticEval = eval/bestValue = tte->eval(), but immediately after re-assign ss-static and eval/bestValue to some new value, which makes the initial assignment redundant. closes official-stockfish#5045 No functional change
Assorted cleanups closes official-stockfish#5046 No functional change Co-Authored-By: Shahin M. Shahin <[email protected]> Co-Authored-By: cj5716 <[email protected]>
This patch does similar thing to how it's done for qsearch - in case of fail high adjust result to lower value. Difference is that it is done only for non-pv nodes and it's depth dependent - so lower depth entries will have bigger adjustment and higher depth entries will have smaller adjustment. Passed STC: https://tests.stockfishchess.org/tests/view/65c3c0cbc865510db0283b21 LLR: 2.96 (-2.94,2.94) <0.00,2.00> Total: 112032 W: 29142 L: 28705 D: 54185 Ptnml(0-2): 479, 13152, 28326, 13571, 488 Passed LTC: https://tests.stockfishchess.org/tests/view/65c52e62c865510db02855d5 LLR: 2.96 (-2.94,2.94) <0.50,2.50> Total: 132480 W: 33457 L: 32936 D: 66087 Ptnml(0-2): 67, 14697, 36222, 15156, 98 closes official-stockfish#5047 Bench: 1168241
Initialize the unordered map to a reasonable number of buckets and make the move hashes well distributed. For more see official-stockfish#4958 (comment) Also make bestThreadPV and newThreadPV references so we don't copy entire vectors. closes official-stockfish#5048 No functional change
Passed STC: https://tests.stockfishchess.org/tests/view/65c6934cc865510db0286e90 LLR: 2.99 (-2.94,2.94) <-1.75,0.25> Total: 54016 W: 14065 L: 13854 D: 26097 Ptnml(0-2): 231, 6381, 13581, 6576, 239 Passed LTC: https://tests.stockfishchess.org/tests/view/65c72b91c865510db0287a1a LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 55098 W: 13850 L: 13658 D: 27590 Ptnml(0-2): 37, 6257, 14777, 6433, 45 closes official-stockfish#5049 Bench: 1027182
No functional change
Search parameters were tuned using 16k games at VVLTC. They were tuned starting with the new parameters (in search only) of PR official-stockfish#5039. Passed VVLTC: https://tests.stockfishchess.org/tests/view/65c8a8fc1d8e83c78bfcd163 LLR: 2.94 (-2.94,2.94) <0.00,2.00> Total: 20826 W: 5355 L: 5100 D: 10371 Ptnml(0-2): 1, 1941, 6275, 2194, 2 Passed 2nd VVLTC: https://tests.stockfishchess.org/tests/view/65cadc2d1d8e83c78bfcfdaf LLR: 2.94 (-2.94,2.94) <0.50,2.50> Total: 17710 W: 4611 L: 4352 D: 8747 Ptnml(0-2): 1, 1586, 5422, 1845, 1 STC Elo estimate: https://tests.stockfishchess.org/tests/view/65cb6aed1d8e83c78bfd0802 Elo: -1.46 ± 1.8 (95%) LOS: 5.5% Total: 40000 W: 10267 L: 10435 D: 19298 Ptnml(0-2): 200, 4860, 10023, 4742, 175 nElo: -2.77 ± 3.4 (95%) PairsRatio: 0.97 Bench: 1198939
Move optExtra, optConstant and maxConstant into lower scope. closes official-stockfish#5052 No functional change
This introduces a form of node counting which can be used to further tweak the usage of our search time. The current approach stops the search when almost all nodes are searched on a single move. The idea originally came from Koivisto, but the implemention is a bit different, Koivisto scales the optimal time by the nodes effort and then determines if the search should be stopped. We just scale down the `totalTime` and stop the search if we exceed it and the effort is large enough. Passed STC: https://tests.stockfishchess.org/tests/view/65c8e0661d8e83c78bfcd5ec LLR: 2.97 (-2.94,2.94) <0.00,2.00> Total: 88672 W: 22907 L: 22512 D: 43253 Ptnml(0-2): 310, 10163, 23041, 10466, 356 Passed LTC: https://tests.stockfishchess.org/tests/view/65ca632b1d8e83c78bfcf554 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 170856 W: 42910 L: 42320 D: 85626 Ptnml(0-2): 104, 18337, 47960, 18919, 108 closes official-stockfish#5053 Bench: 1198939
Passed STC non-reg: https://tests.stockfishchess.org/tests/view/65c691a7c865510db0286e6e LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 234336 W: 60258 L: 60255 D: 113823 Ptnml(0-2): 966, 28141, 58918, 28210, 933 Passed LTC non-reg: https://tests.stockfishchess.org/tests/view/65c8d0d31d8e83c78bfcd4a6 LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 235206 W: 59134 L: 59132 D: 116940 Ptnml(0-2): 135, 26908, 63517, 26906, 137 official-stockfish#5054 Bench: 1287996
This also removes some incorrect fail-high logic. Passed STC: https://tests.stockfishchess.org/tests/view/65cb3b641d8e83c78bfd04a9 LLR: 2.94 (-2.94,2.94) <-1.75,0.25> Total: 87968 W: 22634 L: 22468 D: 42866 Ptnml(0-2): 315, 10436, 22323, 10588, 322 Passed LTC: https://tests.stockfishchess.org/tests/view/65cccee21d8e83c78bfd222c LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 70794 W: 17846 L: 17672 D: 35276 Ptnml(0-2): 44, 7980, 19189, 8126, 58 closes official-stockfish#5055 Bench: 1474424
Created by retraining the previous main net `nn-baff1edbea57.nnue` with: - some of the same options as before: ranger21, more WDL skipping - the addition of T80 nov+dec 2023 data - increasing loss by 15% when prediction is too high, up from 10% - use of torch.compile to speed up training by over 25% ```yaml experiment-name: 2560--S9-514G-T80-augtodec2023-more-wdl-skip-15p-more-loss-high-q-sk28 training-dataset: # official-stockfish#4782 - /data/S6-514G-1ee1aba5ed.binpack - /data/test80-aug2023-2tb7p.v6.min.binpack - /data/test80-sep2023-2tb7p.binpack - /data/test80-oct2023-2tb7p.binpack - /data/test80-nov2023-2tb7p.binpack - /data/test80-dec2023-2tb7p.binpack early-fen-skipping: 28 start-from-engine-test-net: True nnue-pytorch-branch: linrock/nnue-pytorch/r21-more-wdl-skip-15p-more-loss-high-q-torch-compile num-epochs: 1000 lr: 4.375e-4 gamma: 0.995 start-lambda: 1.0 end-lambda: 0.7 ``` Epoch 819 trained with the above config led to this PR. Use of torch.compile decorators in nnue-pytorch model.py was found to speed up training by at least 25% on Ampere gpus when using recent pytorch compiled with cuda 12: https://catalog.ngc.nvidia.com/orgs/nvidia/containers/pytorch See recent main net PRs for more info on - ranger21 and more WDL skipping: official-stockfish#4942 - increasing loss when Q is too high: official-stockfish#4972 Training data can be found at: https://robotmoon.com/nnue-training-data/ Passed STC: https://tests.stockfishchess.org/tests/view/65cd76151d8e83c78bfd2f52 LLR: 2.98 (-2.94,2.94) <0.00,2.00> Total: 78336 W: 20504 L: 20115 D: 37717 Ptnml(0-2): 317, 9225, 19721, 9562, 343 Passed LTC: https://tests.stockfishchess.org/tests/view/65ce5be61d8e83c78bfd43e9 LLR: 2.95 (-2.94,2.94) <0.50,2.50> Total: 41016 W: 10492 L: 10159 D: 20365 Ptnml(0-2): 22, 4533, 11071, 4854, 28 closes official-stockfish#5056 Bench: 1351997
Reduce less on PV nodes even with an upperbound TT entry. Passed STC: https://tests.stockfishchess.org/tests/view/65cb3a861d8e83c78bfd0497 LLR: 2.96 (-2.94,2.94) <-1.75,0.25> Total: 118752 W: 30441 L: 30307 D: 58004 Ptnml(0-2): 476, 14179, 29921, 14335, 465 Passed LTC: https://tests.stockfishchess.org/tests/view/65cd3b951d8e83c78bfd2b0d LLR: 2.95 (-2.94,2.94) <-1.75,0.25> Total: 155058 W: 38549 L: 38464 D: 78045 Ptnml(0-2): 85, 17521, 42219, 17632, 72 closes official-stockfish#5057 Bench: 1303971
Since official-stockfish/fishtest#1870 has been merged it's time for this update. 5k Fixed Games showed no problems. https://tests.stockfishchess.org/tests/view/65d9cc274c0e22b904f574d7 closes official-stockfish#5068 No functional change
closes official-stockfish#5069 No functional change
Based on 130M positions from 2.1M games. ``` Look recursively in directory pgns for games from SPRT tests using books matching "UHO_4060_v..epd|UHO_Lichess_4852_v1.epd" for SF revisions between 8e75548 (from 2024-02-17 17:11:46 +0100) and HEAD (from 2024-02-17 17:13:07 +0100). Based on 127920843 positions from 2109240 games, NormalizeToPawnValue should change from 345 to 356. ``` The patch only affects the UCI-reported cp and wdl values. closes official-stockfish#5070 No functional change
Official release version of Stockfish 16.1 Bench: 1303971 --- Stockfish 16.1 Today, we have the pleasure to announce Stockfish 16.1. As always, you can freely download it at https://stockfishchess.org/download and use it in the GUI of your choice[1]. Don't forget to join our Discord server[2] to get in touch with the community of developers and users of the project! *Quality of chess play* In our testing against its predecessor, Stockfish 16.1 shows a notable improvement in performance, with an Elo gain of up to 27 points and winning over 2 times more game pairs[3] than it loses. *Update highlights* *Improved evaluation* - Updated neural network architecture: The neural network architecture has undergone two updates and is currently in its 8th version[4]. - Removal of handcrafted evaluation (HCE): This release marks the removal of the traditional handcrafted evaluation and the transition to a fully neural network-based approach[5]. - Dual NNUE: For the first time, Stockfish includes a secondary neural network[6], used to quickly evaluate positions that are easily decided. *UCI Options removed* `Use NNUE` and `UCI_AnalyseMode`[7] have been removed as they no longer had any effect. `SlowMover`[8] has also been removed in favor of `Move Overhead`. *More binaries* We now offer 13 new binaries. These new binaries include `avx512`, `vnni256`, `vnni512`, `m1-apple-silicon`, and `armv8-dotprod`, which take advantage of specific CPU instructions for improved performance. For most users, using `sse41-popcnt` (formerly `modern`), `avx2`, or `bmi2` should be enough, but if your CPU supports these new instructions, feel free to try them! *Development changes* - Updated testing book: This new book[9], now derived exclusively from the open Lichess database[10], is 10 times larger than its predecessor, and has been used to test potential improvements to Stockfish over the past few months. - Consolidation of repositories: Aiming to simplify access to our resources, we have moved most Stockfish-related repositories into the official Stockfish organization[11] on GitHub. - Growing maintainer team: We welcome Disservin[12] to the team of maintainers of the project! This extra pair of hands will ensure the lasting success of Stockfish. *Thank you* The Stockfish project builds on a thriving community of enthusiasts (thanks everybody!) who contribute their expertise, time, and resources to build a free and open-source chess engine that is robust, widely available, and very strong. We would like to express our gratitude for the 10k stars[13] that light up our GitHub project! Thank you for your support and encouragement – your recognition means a lot to us. We invite our chess fans to join the Fishtest testing framework[14], and programmers to contribute to the project either directly to Stockfish[15] (C++), to Fishtest[16] (HTML, CSS, JavaScript, and Python), to our trainer nnue-pytorch[17] (C++ and Python), or to our website[18] (HTML, CSS/SCSS, and JavaScript). The Stockfish team [1] https://github.com/official-stockfish/Stockfish/wiki/Download-and-usage#download-a-chess-gui [2] https://discord.gg/GWDRS3kU6R [3] https://tests.stockfishchess.org/tests/view/65d666051d8e83c78bfddbd8 [4] https://github.com/official-stockfish/nnue-pytorch/blob/master/docs/nnue.md#sfnnv8-architecture [5] official-stockfish@af110e0 [6] official-stockfish@584d9ef [7] official-stockfish@c53d2ec [8] official-stockfish@536d692 [9] official-stockfish/books@426eca4 [10] https://database.lichess.org/ [11] https://github.com/official-stockfish/ [12] https://github.com/Disservin [13] https://github.com/official-stockfish/Stockfish/stargazers [14] https://github.com/official-stockfish/fishtest/wiki/Running-the-worker [15] https://github.com/official-stockfish/Stockfish [16] https://github.com/official-stockfish/fishtest [17] https://github.com/official-stockfish/nnue-pytorch [18] https://github.com/official-stockfish/stockfish-web
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### Engine Upgrades * Updated to Stockfish 16.1 (see chesskit-app/Stockfish#3). * Now requires two `.nnue` files to be bundled with the app, see CHANGEGLOG. * Updated to Lc0 0.30 (see chesskit-app/lc0#5). ### Command Execution Updates * Replaced `UCI::execute_command` with native `stdin` calls. * This will allow for much faster updates in the future since the engine code has not been modified. ### Other Changes * `Engine.start()` now requires a completion handler to be provided. * `completion` is called when engine initialization is complete. resolves #11
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main.cppwith_main.cppand added_main.hheader.Swift Package Manager complains when there is a
main.cppfile in a non-executable target which causes errors and other issues building projects that import ChessKitEngine