Recent Releases of pikafish
pikafish - Pikafish 2025-06-23
- Larger L1 size, better performance in long time control games.
- Introduce mid-mirror input feature encoding for better mirroring effects.
- Improve stalemate detection in qsearch.
- C++
Published by PikaCat-OuO 8 months ago
pikafish - Pikafish 2024-08-31
What's New:
1. Updated Computer Rule. If any checking moves appear in the repetition move sequence, it will no longer be considered a chasing sequence. For the updated rule, visit https://pikafish.org/rule.html.
2. Introduced a new NNUE architecture ATT++. This architecture facilitates better playing strength and smaller file size.
3. Added a new UCI option NumaPolicy for CPU affinity selection alongside an improved performance on NUMA systems. For detailed usage of this option, see https://github.com/official-pikafish/Pikafish/wiki/UCI-&-Commands#setoption.
4. Some bug fixes and speed-ups.
- C++
Published by PikaCat-OuO over 1 year ago
pikafish - Pikafish 2024-03-10
Comparing with Pikafish 2023-12-03:
Book: 3mvs 151-350_1097123
TC: 10+0.1 Total/Win/Draw/Lose: 4036 / 1165 / 1979 / 892 PTNML: 33 / 382 / 942 / 601 / 60 WinRate: 53.38% ELO: 23.28[16.64, 30.04] LOS: 100.00 LLR: 3.35[-2.94, 2.94]
TC: 60+0.6 Total/Win/Draw/Lose: 2124 / 597 / 1133 / 394 PTNML: 2 / 162 / 544 / 339 / 15 WinRate: 54.78% ELO: 33.06[25.41, 41.01] LOS: 100.00 LLR: 3.02[-2.94, 2.94]
Book: 3mvs 151-350_1097123 TC: 180+1.8 Total/Win/Draw/Lose: 1414 / 432 / 706 / 276 PTNML: 0 / 76 / 402 / 226 / 3 WinRate: 55.52% ELO: 38.23[29.85, 47.12] LOS: 100.00 LLR: 2.97[-2.94, 2.94]
Shows very good scaling.
- C++
Published by PikaCat-OuO almost 2 years ago
pikafish - Pikafish 2023-12-03
What's New: 1. Rule refinement and now totally comply with https://pikafish.org/rule.pdf. since Pikafish is only focused on computer rule, all options related to old rule have been removed. 2. Network architecture and weights updated, engine parameter tuned via SMP MTC. 3. Enhanced zugzwang resilience, more tough positions can now be solved.
- C++
Published by PikaCat-OuO about 2 years ago
pikafish - Pikafish 2023-03-05
This release heavily increases playing strength at STC via parameter tweaks compared to Pikafish 2023-02-18 on https://pikafish.org :
Slightly better at STC Book: 3mvs 151-350_1097123 TC: 10+0.1 Total/Win/Draw/Lose: 24868 / 6340 / 12462 / 6066 PTNML: 174 / 2944 / 6034 / 2998 / 284 WinRate: 50.55% ELO: 3.58[1.06, 6.07] LOS: 99.72 LLR: 3.04[-2.94, 2.94]
Horribly behind at LTC (within anti-plagiarism safe margin) Book: 3mvs 151-350_1097123 TC: 60+0.6 Total/Win/Draw/Lose: 3652 / 732 / 1921 / 999 PTNML: 12 / 527 / 1009 / 272 / 6 WinRate: 46.34% ELO: -24.84[-36.57, -13.65] LOS: 0.00 LLR: -12.11[-2.94, 2.94]
Compared with the last release on Github:
Scales well at STC: Book: 3mvs 151-350_1097123 TC: 10+0.1 Total/Win/Draw/Lose: 5220 / 1291 / 2997 / 932 PTNML: 18 / 452 / 1322 / 789 / 29 WinRate: 53.44% ELO: 23.37[13.56, 33.47] LOS: 100.00 LLR: 11.55[-2.94, 2.94]
Scales well at LTC: Book: 3mvs 151-350_1097123 TC: 60+0.6 Total/Win/Draw/Lose: 3142 / 790 / 1858 / 494 PTNML: 2 / 191 / 888 / 489 / 1 WinRate: 54.71% ELO: 32.28[21.04, 44.26] LOS: 100.00 LLR: 11.47[-2.94, 2.94]
What's New: 1. Introduced a new lossless feature merging architecture to reduce the size of the weights file while remains the same playing strength. 2. Allow repetition fold changing. 3. Add dot product instruction set support for Android devices, around 10% speed up measured.
- C++
Published by PikaCat-OuO almost 3 years ago
pikafish - Pikafish 2023-02-16
This version is extremely powerful compared to 2022-12-26: 59.73 ELO stronger than 2022-12-26 in STC: Book: 3mvs 151-350_1097123 TC: 10+0.1 Total/Win/Draw/Lose: 2302 / 771 / 1156 / 375 PTNML: 5 / 139 / 523 / 423 / 61 WinRate: 58.60% ELO: 59.73[43.51, 78.12] LOS: 100.00 LLR: 10.69[-2.94, 2.94]
41.84 ELO stronger than 2022-12-26 in LTC: Book: 3mvs 151-350_1097123 TC: 60+0.6 Total/Win/Draw/Lose: 2378 / 689 / 1289 / 400 PTNML: 0 / 166 / 598 / 395 / 30 WinRate: 56.08% ELO: 41.84[28.53, 56.26] LOS: 100.00 LLR: 10.33[-2.94, 2.94]
- We switched to advisor and bishop missing bucketing NNUE architecture, an idea by mualanhlung017.
- Part of the Chinese Rule is also supported in this release. You can enable it by setting the
Repetition Ruleoptions toChineseRule. In Chinese Rule, detection for the illegal sequencex check y chase z mate threatis enabled where x, y, and z do not equal zero simultaneously. - For speed concerns, you can tweak the
Mate Threat Depthoption, it defines how many checks one side needs to make at most to form a checkmate when the opponent gives up moving this round. The larger the value, the slower the speed. Default to 1. - When
Mate Threat Depthis set to 0, it means that the engine does not detectMate Threat, and the illegal sequence becomesx check y chasewhere x and y do not equal zero simultaneously
- C++
Published by PikaCat-OuO about 3 years ago
pikafish - Pikafish 2022-12-26
Compared to version 2022-10-22, we are having 60 move rule and 3-fold repetition at root nodes that almost fully comply with 亚规 now. In addition to that, we also use the WDL model for score outputs and add all of these as tweakable UCI options for convenience. Strict threefold even in search is also an option disabled by default but will be great to enable when analyzing positions. The new compression architecture has been applied and a new arch net has also been released.
A small test confirmed at least 26 ELO gains against Pikafish version 2022-10-22: Book: 3mvs 140-200_150560 TC: 10+0.1 Total/Win/Draw/Lose: 1548 / 359 / 949 / 240 PTNML: 14 / 109 / 404 / 238 / 9 WinRate: 53.84% ELO: 26.20[15.87, 36.90] LOS: 100.00 LLR: 3.29[-1.56, 2.77]
- C++
Published by PikaCat-OuO about 3 years ago
pikafish - Pikafish 2022-10-22
This build still uses the nnue file trained using the same data as the last release, but with some adjustments, and gets a relatively good enhancement in LTC games. As for high score miseval in the endgame, wait for later releases.
versus 2022.10.15 Book: 3 Moves 140-200 Red Advantage TC: 10+0.1 Total/Win/Draw/Lose: 1974 / 497 / 1112 / 365 PTNML: 13 / 172 / 488 / 298 / 16 WinRate: 53.34% ELO: 22.69[12.93, 32.71] LOS: 100.00 LLR: 3.94[-2.94, 2.94]
Book: 3 Moves 140-200 Red Advantage TC: 60+0.6 Total/Win/Draw/Lose: 1954 / 448 / 1260 / 246 PTNML: 2 / 111 / 552 / 307 / 5 WinRate: 55.17% ELO: 35.56[24.43, 47.48] LOS: 100.00 LLR: 6.63[-2.94, 2.94]
- C++
Published by PikaCat-OuO over 3 years ago
pikafish - Pikafish 2022-10-15
This build plays at the level of the latest version of the commercial engine AlphaCat aka AlphaCatFriendly 2022-09-26.
- C++
Published by PikaCat-OuO over 3 years ago