Stockfish

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Stockfish logo^[1]

Stockfish 12 logo^[2]

Stockfish,
anUCI compatibleopen source chess engine developed byTord Romstad,Marco Costalba,Joona Kiiski andGary Linscott^[3], licensed under theGPL v3.0. Marco forked the project from version 2.1 of Tord's engineGlaurung, first announced by Marco in November 8, 2008^[4], and in early 2009 Joona'sSmaug, a further Glaurung 2.2 derivative, was incorporated^[5]. Starting among the top twenty engines, Stockfish has quickly climbed instrength to become the world strongest chess entity as of 2018 - at least concerning theAlphaZero hype^[6], public available chess entity. The name "Stockfish" reflects the ancestry of the engine. Tord is Norwegian and Marco Italian, and there is a long history ofstockfish trade from Norway to Italy (to Marco's home town ofVicenza, in fact). Stockfish is also referred to as another famous "little fish", the then strongest chess engineRybka. In 2011, Marco Costalba and Joona Kiiski stepped down as Stockfish maintainers^[7]. From that, the project is being developed and maintained by theStockfish community.

A synergy effect with theShogi community led to the promising branch ofStockfish NNUE, courtesy ofNodchip, who introducedNNUE to Stockfish in 2019^[8]. On September 02, 2020,Stockfish 12 was released with a huge jump inplaying strength due to NNUE and furthertuning of the engine^[9]. The release ofStockfish 13 on February 19, 2021, has been triggered by the start of sales of theFat Fritz 2 engine byChessBase, based on a recent development version of Stockfish with minor modifications^[10].Stockfish 14, released on July 02, 2021, further improved due to efforts byTomasz Sobczyk andGary Linscott in designing a newNNUE architecture in conjunction with aGPU accelerated trainer written inPyTorch. Further, the collaboration with theLeela Chess Zero team payed off, in providing billions of positions to train the new NNUE^[11].

Stockfish 16, released June 30, 2023, removes the classicalevaluation from the engine and focuses onNNUE neural networks.^[12]

Platforms

Since Stockfish is written inC++, it may be compiled and built for various processors and operating systems. The main source code of Stockfish could be compiled directly intoCommand Line Interface program. Some programmers have added code to change it into aGraphical User Interface one, which may be compulsory to run on some platforms such as iOS.

Command Line Interface

Stockfish forAndroid,Linux,macOS, andWindows was officially built by the developer team and published on bothStockfish website andStockfish GitHub

Stockfish with built-inGraphical User Interface

We list only some programs that are popular and license-compliant (released with source code):

Stockfish formacOS was also built and published onMac App Store byDaylen Yang, who is also responsible for the Stockfish website
Stockfish foriOS was built by Tord Romstad^[13].

Stockfish foriOS andwatchOS was built with the appBanksiaGUI for iOS byNguyen Pham
Stockfish forAndroid was built with the appDroidfish byPeter Österlund

Fishtest

The Stockfish Testing Framework dubbedFishtest^[14] is aweb application written byGary Linscott^[15]^[16], based on aSETI@home kind ofvolunteer computing.Fishtest is mainly written inPython under thePyramid Application Development Framework^[17], and distributes games across different machines to reduce the test latency and increase throughput. Started in early 2013 with Stockfish 3.0, Fishtest has hundreds of contributors, as of July 2024, 2226 testers and 363 developers^[18] active in testing ideas and tweaks^[19], to make Stockfish the strongest chess entity of the world^[20].

Evaluation Guide

Since April 2017 the interactiveStockfish Evaluation Guide is available to explore Stockfish'sevaluation with aJavaScript implementation running in abrowser^[21]. One may enter aFEN string of aposition, to get the resultingscore of the main evaluation term considering thegame phases within itstapered evaluation, and may navigate through the tree of subterms and features with its particular characteristics for the given position^[22], also supportingStockfish NNUE nets^[23].

Tournament Play

Stockfish is top contender of the prestigiousTop Chess Engines Competition (TCEC), reaching the superfinals sinceseason 4, and established its world number one status in winning TCECs, leaving its commercial rivalsKomodo andHoudini behind.Sinceseason 14 in early 2019, Stockfish competes with thedeep learning Leela Chess Zero engines, whoseplaying strength triggered a motivation boost in the developing community to improve Stockfish further.

GM+Rybka vs. Stockfish

On July 19, 2014, Stockfish 5 played a four-game match versusDaniel Naroditsky plusRybka 3 (2008), 45 minutes plus 30-second increment. Stockfish won 3½ - ½^[24]^[25] . A few weeks later the experiment continued withHikaru Nakamura inBurlingame, California^[26] . Supported two games by Rybka 3, Nakamura lost ½ - 1½, two games with pawn odds (Stockfish both Black without h- and b-pawn) ended ½ - 1½ in favour of Stockfish 5 as well. It played the latest development build compiled forOS X running on a 3 GHz 8-CoreMac Pro^[27] .

Selected Features

^[28]

Board Representation

BMI2 - PEXT Bitboards (not recommend forAMD Ryzen^[29] prior toZen 3)

Piece-Lists until Stockfish 12^[30]^[31]^[32]

Search

Iterative Deepening
Aspiration Windows
Improving Heuristic
Parallel Search usingThreads
- YBWC prior to Stockfish 7
- Lazy SMP since Stockfish 7, January 2016
Principal Variation Search
Transposition Table
- Shared Hash Table
- 10Bytes perEntry, 3 Entries perCluster
- Depth-preferred Replacement Strategy
- NoPV-Node probing
- Prefetch
Move Ordering
- Continuation History
  - Counter Moves History since Stockfish 7, January 2016^[33]
- Capture History
- History Heuristic
- MVV/LVA
- SEE
Selectivity

Evaluation

NNUE
- SFNNv1 (Introduced 2020-08-06)
- SFNNv2 (Introduced 2021-05-18)
- SFNNv3 (Introduced 2021-08-15)
- SFNNv4 (Introduced 2022-02-10)
- SFNNv5 (Introduced 2022-05-14)
- SFNNv6 (Introduced 2023-05-31)
- SFNNv7 (Introduced 2023-07-01)
- SFNNv8 (Introduced 2023-09-22)

See alsoEvaluation Philosophy^[34]^[35]

ClassicalEvaluation

Classical Evaluation (traditional hand-crafted evaluation) has been removed since version 16.

Tapered Eval
Score Grain: ~1/256 of apawn unit
Material
- Point Values
  - Midgame: 198, 817, 836, 1270, 2521
  - Endgame: 258, 846, 857, 1278, 2558
- Bishop Pair
- Imbalance Tables
- Material Hash Table
Piece-Square Tables
Space
Mobility
- Trapped Pieces
- Rooks on (Semi) Open Files
Outposts
Pawn Structure
King Safety
Evaluation Patterns

Misc

SPSA

Syzygy Bases

Release Dates

2008

Stockfish 1.0 - November 02, 2008
Stockfish 1.01 - November 03, 2008
Stockfish 1.1 - December 06, 2008
Stockfish 1.1a - December 08, 2008
Stockfish 1.2 - December 29, 2008

2009

Stockfish 1.3 - May 02, 2009
Stockfish 1.3.1 - May 03, 2009
Stockfish 1.4 - July 05, 2009
Stockfish 1.5 - October 04, 2009
Stockfish 1.5.1 - October 11, 2009
Stockfish 1.6 - December 25, 2009
Stockfish 1.6.1 - December 25, 2009
Stockfish 1.6.2 - December 31, 2009

2010 ...

Stockfish 1.6.3 - February 02, 2010
Stockfish 1.7 - April 08, 2010
Stockfish 1.7.1 - April 10, 2010
Stockfish 1.8 - July 02, 2010
Stockfish 1.9 - October 02, 2010
Stockfish 1.9.1 - October 05, 2010

2011

Stockfish 2.0 - January 01, 2011
Stockfish 2.0.1 - January 04, 2011
Stockfish 2.1 - May 04, 2011
Stockfish 2.1.1 - May 08, 2011
Stockfish 2.2 - December 29, 2011

2012

Stockfish 2.2.1 - January 06, 2012
Stockfish 2.2.2 - January 14, 2012
Stockfish 2.3 - September 15, 2012
Stockfish 2.3.1 - September 22, 2012

2013

Stockfish 3 - April 30, 2013
Stockfish 4 - August 20, 2013
Stockfish DD - November 29, 2013
Stockfish 5 - May 31, 2014

2015 ...

Stockfish 6 - January 27, 2015
Stockfish 7 - January 02, 2016
Stockfish 8 - November 01, 2016
Stockfish 9 - February 01, 2018
Stockfish 10 - November 29, 2018

2020 ...

Stockfish 11 - January 18, 2020
Stockfish 12 - September 02, 2020
Stockfish 13 - February 19, 2021
Stockfish 14 - July 02, 2021
Stockfish 15 - April 18, 2022
Stockfish 15.1 - December 04, 2022
Stockfish 16 - June 30, 2023
Stockfish 16.1 - February 24, 2024
Stockfish 17 - September 06, 2024

2025 ...

Stockfish 17.1 - March 30, 2025

Stockfish 18 - January 31, 2026

Ports

Derivatives

Authors

Founders of the Stockfish project and Fishtest infrastructure

Authors and inventors of NNUE, training, NNUE port

All other authors of the code

There are 196 authors, counted to version 15.1.

Contributors

Elo Progress

of Stockfish in first 10 years^[37]

Publications

Arno Nickel (2012).Die schöne neue Welt der Schachengines.SCHACH 2,3,5,6 2012,pdf (German)^[38]
Oleg Arenz (2012).Monte Carlo Chess. B.Sc. thesis,Darmstadt University of Technology, advisorJohannes Fürnkranz,pdf »Monte-Carlo Tree Search
Tamal T. Biswas,Kenneth W. Regan (2015).Quantifying Depth and Complexity of Thinking and Knowledge.ICAART 2015,pdf
Tamal T. Biswas,Kenneth W. Regan (2015).Measuring Level-K Reasoning, Satisficing, and Human Error in Game-Play Data.IEEE ICMLA 2015,pdf preprint
Shu Yokoyama,Tomoyuki Kaneko,Tetsuro Tanaka (2015).Parameter-Free Tree Style Pipeline in Asynchronous Parallel Game-Tree Search.Advances in Computer Games 14 ,pdf »P-GPP
Jean-Marc Alliot (2017).Who is the Master?ICGA Journal, Vol. 39, No. 1,draft as pdf^[39]
Bill Jordan (2020).Calculation versus Intuition: Stockfish versus Leela.amazon »TCEC,Leela Chess Zero

Forum Posts

2008 ...

Stockfish 1.0 byMarco Costalba,CCC, November 02, 2008
Please drop Stockfish byMarco Costalba,CCC, November 07, 2008

2009

Re: Stockfish - Glaurung byTord Romstad,WBEC-Ridderkerk forum, September 05, 2009
Stockfish 1.5.1 byMarco Costalba,CCC, October 08, 2009

2010 ...

Stockfish 1.7 byMarco Costalba,CCC, April 08, 2010
Stockfish-1.7.0 Hyper-threading Detection byLouis Zulli,CCC, April 09, 2010 »Thread
stockfish fail high fail low byUri Blass,CCC, April 13, 2010
MTD experiment with stockfish 1.7.1 byVratko Polák,CCC, April 15, 2010
about stockfish and logic byUri Blass,CCC, April 17, 2010
Stockfish - material balance/imbalance evaluation byRalph Stoesser,CCC, May 05, 2010
Qsearch of Stockfish 1.7.1 byFerdinand Mosca,CCC, May 13, 2010
Stockfish do_move + undo_move byMatthew Purland,CCC, June 02, 2010
static null move pruning is stockfish byTom King,CCC, June 13, 2010
Stockfish - single evasion extensions byRalph Stoesser,CCC, June 27, 2010
Stockfish 1.8 JA available byJim Ablett,CCC, July 02, 2010
stockfish 1.8 - Eval hash gone? byEdward Yu,CCC, July 04, 2010
Stockfish Singular Extension, does it make sense? byVolker Böhm,CCC, July 08, 2010
Stockfish 1.8 tweaks byVratko Polák,CCC, July 09, 2010
Stockfish question byRebel,OpenChess Programming Forum, July 10, 2010
Taken from CCC (Stockfish & mainlines) byRebel,OpenChess Programming Forum, July 12, 2010
backward pawns in Stockfish byMarek Kwiatkowski,CCC, July 16, 2010
Questions for the Stockfish team byMichael Sherwin,CCC, July 16, 2010
Stockfish 1.8 - eval cache byRalph Stoesser,CCC, July 18, 2010 »Evaluation Hash Table
Stockfish null move pre-condition byRein Halbersma,CCC, July 22, 2010 »Null Move Pruning
Stockfish for 39 dollars byMatthias Gemuh,CCC, August 26, 2010
Stockfish 1.9 JA update available byJim Ablett,CCC, October 02, 2010
mobility evaluation of stockfish byUri Blass,CCC, October 09, 2010

2011

Stockfish 2.0 Available byJim Ablett,CCC, January 01, 2011
Stockfish 2.0.0 tests byHarun Taner,CCC, January 04, 2011
Stockfish "Use Sleeping Threads" Test byLouis Zulli,CCC, January 05, 2011
StockFish engine byAndriy Dzyben,CCC, January 11, 2011
Designing an analysis friendly Stockfish? by Uly,Open Chess Programming Forum, January 28, 2011
Why are the Ippo derivative stronger than Stockfish? byLarry Kaufman,CCC, 24 February, 2011
Transposition Table updates in Stockfish byOnno Garms,CCC, April 12, 2011 »Transposition Table
Stockfish random generator (rkiss.h) byMartin Sedlak,CCC, Apr 15, 2011 »Bob Jenkins
futility pruning in stockfish byEngin Üstün,CCC, May 25, 2011 »Futility Pruning
Stockfish clones in the AppStore: it's becoming a plague... byJulien Marcel,CCC, May 28, 2011 »Clones
Root node search in Stockfish byOnno Garms,CCC, June 12, 2011 »Move Ordering,Root
Grandmaster prefers Stockfish evals byAlbert Silver,CCC, September 29, 2011
Stockfish on github byMarco Costalba,CCC, October 02, 2011
Stockfish's tuning method byJoona Kiiski,CCC, October 07, 2011 »Stockfish's Tuning Method

2012

StockFish LS with LimitStrength feature byAlexander Schmidt,CCC, January 01, 2012
Stockfish Code ( Piece Value's) by Nolan Denson,CCC, January 10, 2012 »Point Value
Stockfish hash implementation byJon Dart,CCC, January 10, 2012 »Transposition Table
Stockfish 2.2.2 JA update available byJim Ablett,CCC, January 14, 2012
CLOP on Stockfish byGary,CCC, March 10, 2012 »CLOP
optimal aspiration window for stockfish question byUri Blass,CCC, March 12, 2012 »Aspiration Windows
Raspberry Pi / Stockfish dedicated chess computer/board byJean-Francois Romang,CCC, August 26, 2012 »Raspberry Pi,Dedicated Chess Computers
Stockfish 2.3 update available byJim Ablett,CCC, September 15, 2012

2013

10 Lessons to be Learned from todays Top Engines by Josef,Rybka Forum, January 03, 2013 »Houdini,Komodo
Stockfish 3 Official JA Windows/Linux builds available byJim Ablett,CCC, April 30, 2013
Fishtest Distributed Testing Framework byMarco Costalba,CCC, May 01, 2013 »Fishtest
Re: History pruning / move ordering question byJoona Kiiski,CCC, May 12, 2013 »Countermove Heuristic
Stockfish 3 PA_GTB byJeremy Bernstein,OpenChess Forum, May 15, 2013
Probcut byGary,CCC, May 24, 2013 »ProbCut
Stockfish bug bySteven Atkinson,CCC, May 30, 2013 »Repetitions
The Ultimate Stockfish! byMike Scheidl,CCC, July 09, 2013
use sleeping threads byDon Dailey,CCC, July 10, 2013 »Parallel Search,Thread
Stockfish 4 byMarco Costalba,CCC, August 20, 2013
18 days from SF4 release and about ~30+ ELO gain! by Alexandre Meirelles Souza,CCC, September 08, 2013
How much of Stockfish code is still from Tord Romstad? byJouni Uski,CCC, September 16, 2013
Syzygy tablebases, work in Stockfish? byJose Mº Velasco,CCC, September 23, 2013 »Syzygy Bases
Stockfish search byHarm Geert Muller,CCC, October 28, 2013 »Principal Variation
Some food for thought bySpacious Mind,Hiarcs Forum, November 11, 2013 »Stockfish vs.Tasc CM32 512K The King 2.2
Stockfish scaling byEd Schröder,CCC, November 15, 2013
Stockfish depth vs. others; challenge byLarry Kaufman,CCC, November 24, 2013 »Depth
Stockfish DD: a new official release byMarco Costalba,CCC, November 29, 2013 »TCEC Season 5, dedicated toDon Dailey
Stockfish Syzygy: how to interpret mates? byJouni Uski,CCC, December 01, 2013 »Syzygy Bases,Mate Scores
Is SF DD greater efficiency would be null move pruning? by Jonathan Lee,CCC, December 22, 2013 »Null Move Pruning

2014

Help me to test an idea for Stockfish by Robert Tournevisse,CCC, January 03, 2014 »Piece-Square Tables,Tapered Eval
Stockfish seems definitely the strongest engine byKai Laskos,CCC, January 21, 2014
Stockfish Mac app byDaylen Yang,CCC, January 22, 2014 »Macintosh
Stockfish goes EGBB byDaniel Shawul,CCC, January 29, 2014 »Scorpio Bitbases
fixing the null move search "bug" byUri Blass,CCC, February 01, 2014 »Null Move Pruning
Disabling Null Move Pruning in Stockfish byLouis Zulli,CCC, February 15, 2014 »Null Move Pruning
Threads-Test byAndreas Strangmüller,CCC, March 18, 2014 »Thread,Parallel Search
Stockfish haswell optimized build byJean-Francois Romang,CCC, April 06, 2014 »BMI2
Huge simplification byLyudmil Tsvetkov,CCC, April 25, 2014 »Pawn Chain
Stockfish zero evals byLarry Kaufman,CCC, May 02, 2014
Threads-Test - SF, Zappa, Komodo - 1 vs. 2, 4, 8, 16 Threads byAndreas Strangmüller,CCC, May 04, 2014 »Thread,Stockfish,Zappa,Komodo
investigating why stockfish is strong idea byUri Blass,CCC, May 05, 2014
Threads factor: Komodo, Houdini, Stockfish and Zappa byAndreas Strangmüller,CCC, May 17, 2014 »Komodo,Houdini,Stockfish,Zappa
Goodbye CLOP, hello SPSA byGary Linscott,FishCooking, May 17, 2014 »CLOP,SPSA
Stockfish 5 byMarco Costalba,CCC, May 31, 2014
Stockfish Status Report byLouis Zulli,CCC, June 27, 2014
GM and Rybka vs. Stockfish by Robert Maddox,CCC, August 09, 2014 »GM+Rybka vs. Stockfish
Nakamura vs Stockfish, public match 8/23 by Jesse L,CCC, August 17, 2014
Using the Transposition Table for long searches by Theodr Elwurtz,FishCooking, September 22, 2014 »Transposition Table
Rule of the square byMikael,FishCooking, September 24, 2014 »Rule of the Square
Using the Stockfish position evaluation score to predict victory probability by unavoidablegrain,Tumblr, September 28, 2014 »Pawn Advantage, Win Percentage, and Elo
Threads test incl. Stockfish 5 and Komodo 8 byAndreas Strangmüller,CCC, October 09, 2014
Threads test - Stockfish 5 against Komodo 8 byAndreas Strangmüller,CCC, October 10, 2014 »Thread,Parallel Search,Stockfish,Komodo
Stockfish and accurate PV byMatthew Lai,CCC, December 25, 2014 »Principal Variation
Stockfish 32-bit and hardware instructions on MSVC++ bySyed Fahad,CCC, December 30, 2014 »BitScan,Population Count

2015 ...

Stockfish in Lozza UIs byColin Jenkins,CCC, January 07, 2015 »Lozza,Stockfish-js^[40]
SF6 has been released byJoona Kiiski,CCC, January 27, 2015
Stockfish 6 is impressive in Behting study byJouni Uski,CCC, January 31, 2015 »Behting Study
Stockfish with 16 threads - big news? byLouis Zulli,CCC, February 15, 2015 »Thread

Explanation for non-expert? byLouis Zulli,CCC, February 16, 2015 »Parallel Search

Stockfish still scales poorly? byLouis Zulli,CCC, February 20, 2015
Measuring SF idle time byLouis Zulli,CCC, February 21, 2015
Better NPS scaling for Stockfish byLouis Zulli,CCC, February 27, 2015
Stockfish Questions bySyed Fahad,CCC, February 28, 2015
Best Stockfish NPS scaling yet byLouis Zulli,CCC, March 02, 2015
Stockfish contempt factor byKai Laskos,CCC, March 10, 2015 »Contempt Factor
Improving SF passer code byLyudmil Tsvetkov,CCC, March 26, 2015 »Connected Passed Pawns
Problem with SF6 and Syzygy TB by Forrest Hoch,CCC, April 01, 2015 »Syzygy Bases
Empirical results with Lazy SMP, YBWC, DTS byKai Laskos,CCC, April 16, 2015 »Lazy SMP,YBWC,DTS
The effective speedup from 1 to 8 cpus for SF and Komodo byAdam Hair,CCC, May 31, 2015 »Parallel Search,Komodo
New Stockfish with Lazy_SMP, but what about the TC bug ? byErnest Bonnem,CCC, October 26, 2015 »Parallel Search,TCEC Season 8
Binary for TCEC superfinal by Kiran Panditrao,FishCooking, October 30, 2015 »TCEC Season 8
SF binaries for TCEC superfinal byMarco Costalba,CCC, October 31, 2015
Stockfish dev 091115 for ANDROID by Nathanael Russell,CCC, November 09, 2015 »Android
Stockfish now benefits from hyperthreading byDmitri Gusev,CCC, November 12, 2015 »Thread
Stockfish 7 beta 1 byJoona Kiiski,CCC, December 27, 2015
Another GHI example in SF (maybe) byBB+,OpenChess Forum, December 30, 2015 »Graph History Interaction

2016

Stockfish 7 byJoona Kiiski,CCC, January 02, 2016
Threads test incl. Stockfish 7 byAndreas Strangmüller,CCC, January 11, 2016 »Thread,Parallel Search
Stockfish 7 progress by Carl Lumma,CCC, January 16, 2016
Oddity around depths 7-8 with Stockfish 6 & 7 byKen Regan,CCC, January 21, 2016
Stockfish 7 and partial 6 piece syzygy problem? byJouni Uski,CCC, March 01, 2016

Re: Stockfish 7 and partial 6 piece syzygy problem? byMarco Costalba,CCC, September 01, 2016

Computer Chess Progress: Stockfish 7 vs Ruffian 1.0.5 byMartin Fierz,CCC, March 17, 2016 »Ruffian
Natural TB byMarco Costalba,CCC, May 29, 2016 »Syzygy Bases
Stockfish eval output byErin Dame,CCC, August 27, 2016 »Wrong Color Bishop and Rook Pawn
Re: Beginner's guide to graphical profiling byMarco Costalba,CCC, September 10, 2016 »Profiling
ELO inflation ha ha ha byHenk van den Belt,CCC, September 16, 2016 »Delphil,Match Statistics,Playing Strength,TCEC Season 9^[41]
pin-aware see byRonald de Man,FishCooking, September 14, 2016 »SEE - The Swap Algorithm,Pin
Illegal moves in SEE byStephane Nicolet,FishCooking, September 22, 2016 »SEE - The Swap Algorithm
Stockfish underpromotes much more often than Komodo byKai Laskos,CCC, October 05, 2016 »Komodo,Match Statistics,Promotions
couple of questions about stockfish code ? byMahmoud Uthman,CCC, October 26, 2016 »SIMD and SWAR Techniques,Tapered Eval
Stockfish 8 byMarco Costalba,FishCooking, November 01, 2016
Stockfish 8 official byMarco Costalba,CCC, November 01, 2016
NUMA test compilation by Joachim Müller,FishCooking, November 05, 2016 »NUMA
Stockfish 8 - Double time control vs. 2 threads byAndreas Strangmüller,CCC, November 15, 2016 »Doubling TC,Diminishing Returns,Playing Strength,Lazy SMP
Stockfish benchmark data byAdam Hair,OpenChess Forum, November 27, 2016
The new chess rules (5-fold repetition and 75-move draw) byLyudmil Antonov,FishCooking, November 29, 2016 »Repetitions,Fifty-move Rule
Scoutfish: powerful chess query tool byMarco Costalba,CCC, December 11, 2016 »Databases,Portable Game Notation,Scoutfish

2017

SF Progression since Fishtest inception byAdam Hair,CCC, January 14, 2017 »Fishtest
Re: Chessprogams with the most chessknowing byMarco Costalba,CCC, February 19, 2017 »Search versus Evaluation
Stockfish bench in i486 & Pentium 75mhz ! by hammerklavier,CCC, April 29, 2017

Re: Stockfish bench ...

Symmetric multiprocessing (SMP) scaling - SF8 and K10.4 byAndreas Strangmüller,CCC, May 05, 2017 »Lazy SMP,Komodo
Symmetric multiprocessing (SMP) scaling - SF8 Contempt=10 byAndreas Strangmüller,CCC, May 13, 2017 »SMP,Contempt Factor
Stockfish version with hash saving capability byDaniel José Queraltó,CCC, July 25, 2017 »Persistent Hash Table
Natural TB (take 2) byMarco Costalba,CCC, August 22, 2017 »Syzygy Bases
Approximating Stockfish's Evaluation by PSQTs byThomas Dybdahl Ahle,CCC, August 23, 2017 »Regression,Piece-Square Tables
Stockfish no progress in 2month and half , why ? by Jean Baptiste,CCC, August 28, 2017
Stockfish testing at STC and LTC: one question byJouni Uski,CCC, September 19, 2017
Scaling from FGRL results with top 3 engines byKai Laskos,CCC, September 26, 2017 »FGRL,Houdini,Komodo
AlphaZero vs Stockfish by Bigler,CCC, December 06, 2017 »AlphaZero vs. Stockfish
A branch to test the Monte Carlo algorithm in Stockfish byStephane Nicolet,FishCooking, December 06, 2017 »Monte-Carlo Tree Search,AlphaZero
Reactions about AlphaZero from top GMs... byNorman Schmidt,CCC, December 08, 2017 »AlphaZero: Reactions From Top GMs, Stockfish Author,Tord Romstad
MCTS wrapper for StockFish byJonathan Baxter,FishCooking, December 19, 2017 »Monte-Carlo Tree Search

2018

Stockfish 8 - Initial position until depth 59 byAndreas Strangmüller,CCC, January 16, 2018 »Initial Position
New Stockfish contempt byJouni Uski,CCC, January 29, 2018 »Contempt Factor
Contributors in the last two years byStephane Nicolet,FishCooking, Jnauary 30, 2018
Stockfish 9 byMarco Costalba,CCC, February 01, 2018
Elo measurement of contempt in SF in self-play byMichel Van den Bergh,CCC, March 10, 2018 »Contempt,Playing Strength
Stockfish 180113 - Initial position until depth 65 byAndreas Strangmüller,CCC, March 27, 2018 »Initial Position
Stockfish and serious hardware: 384 threads byJouni Uski,CCC, July 08, 2018 »Thread
Stockfish 10 - Call for Binaries byDaylen Yang,FishCooking, November 29, 2018
Re: piece lists advantage with bit-boards? byRonald de Man,CCC, December 26, 2018 »Piece-Lists,asmFish

2019

Re: What's the best Lazy SMP logic? bySven Schüle,CCC, January 06, 2019 »Lazy SMP in Stockfish
Training the trainer: how is it done for Stockfish? byMarc-Philippe Huget,CCC, March 01, 2019 »Monte-Carlo Tree Search
Some NUMA data for Stockfish-dev and Cfish-dev byLouis Zulli,CCC, June 17, 2019 »NUMA,CFish
Why does stockfish randomise draw evaluations? byVincent Tang,CCC, September 01, 2019 »Draw,Draw Evaluation,Draw Score,Search with Random Leaf Values
Help needed testing vectorized Stockfish pawns.cpp... byNick Pelling,FishCooking, September 23, 2019
mg vs eg eval byJoost VandeVondele,FishCooking, October 06, 2019 »Middlegame,Endgame,Tapered Eval
Stockfish contempt testing by Leonardo Ljubičić,FishCooking, October 29, 2019 »Contempt
some questions about singular search in Stockfish byJon Dart,CCC, November 01, 2019 »Singular Extensions
"stat score bonus" in stockfish byVivien Clauzon,CCC, November 01, 2019
Stockfish 10 was released 29.11.2018 byJouni Uski,CCC, December 01, 2019

2020 ...

lazy smp behaviour of stockfish byDaniel Shawul,FishCooking, January 05, 2020 »Lazy SMP
The Stockfish of shogi byLarry Kaufman,CCC, January 07, 2020 »NNUE,Shogi
Stockfish 11 byStephane Nicolet,CCC, January 18, 2020
Stockfish Reverts 5 Recent Patches by Deberger,CCC, February 01, 2020

Re: Stockfish Reverts 5 Recent Patches byMichel Van den Bergh,CCC, February 02, 2020 »SPRT

Stockfish and latest +6 ELO patch! byJouni Uski,CCC, March 05, 2020 »Distance,Space-Time Tradeoff^[42]
Null move byRobert Pope,CCC, April 24, 2020 »Null Move Pruning
Stockfish_dev is probably stronger than Sargon 1978 v1.00 byKai Laskos,CCC, May 29, 2020 »Sargon
Stockfish NN release (NNUE) byHenk Drost,CCC, May 31, 2020 »NNUE,Stockfish NNUE
Stockfish has included WDL stats in engine output by Deberger,CCC, July 02, 2020 »Pawn Advantage, Win Percentage, and Elo
stockfishNNUE vs others (TCEC 18 bonus) byWarren D. Smith,FishCooking, July 14, 2020
Can the sardine! NNUE clobbers SF byHenk Drost,CCC, July 16, 2020 »Stockfish NNUE
The most stupid idea by the Stockfish Team by Damir,CCC, August 30, 2020 »Stockfish NNUE
Stockfish 12 byJoost VandeVondele,FishCooking, September 02, 2020
Stockfish 12 is released today! by Nay Lin Tun,CCC, September 02, 2020
Stockfish 12 has arrived! by daniel71,CCC, September 02, 2020
SF NNUE/Classical byFauzi,FishCooking, October 05, 2020 »Stockfish NNUE
Re: Stockfish bench in i486 & Pentium 75mhz ! byVincent Lejeune,CCC, October 11, 2020 »Stockfish bench ...
Re: Raspberry Pi 4 compiled chess engines byRasmus Althoff,CCC, November 16, 2020 »Raspberry Pi

2021

Shouldn't positional attributes drive SF's NNUE input features (rather than king position)? byNick Pelling,FishCooking, January 10, 2021 »Stockfish NNUE
Stockfish 13 byJoost VandeVondele,FishCooking, February 19, 2021
Stockfish 13 merged on github byJoshua Shriver,CCC, February 19, 2021
Setting up Stockfish on a server by Jon12345,CCC, March 29, 2021 »Chess Server
Joking FTW, Seriously by borg,LCZero blog, April 25, 2021
Stockfish with new NNUE architecture and bigger net released byStefan Pohl,CCC, May 19, 2021^[43]^[44]
The importance of open data by borg ,LCZero blog, June 15, 2021
will Tcec allow Stockfish with a Leela net to play? by Wilson,CCC, June 17, 2021 »TCEC Season 21

Re: will Tcec allow Stockfish with a Leela net to play? byConnor McMonigle,CCC, June 17, 2021

Stockfish 14 release round the corner by Prasanna Bandihole,CCC, July 02, 2021
Before things become more messy than they already are byEd Schröder,CCC, July 02, 2021
Stockfish 14 has been released by Madeleine Birchfield,CCC, July 02, 2021
Stockfish: Our lawsuit against ChessBase by Kurt Lanc,CCC, July 20, 2021
The Great Stockfish NPS Debate by Dietrich Kappe,CCC, August 27, 2021

2022

Stockfish search by Werewolf,CCC, March 26, 2022 »Lazy SMP
Stockfish 15 is ready by Mehmet Karaman,CCC, April 19, 2022
Stockfish 15's Immortal Game? byGraham Banks,CCC, May 01, 2022
Are tablebases useless for Stockfish15? byJouni,CCC, September 02, 2022
Stockfish 15.1 is ready byMehmet Karaman,CCC, December 05, 2022
SF branching factor byJouni,CCC, December 05, 2022

2023

Stockfish randomicity by amchess,CCC, September 21, 2023 »Search
Why is Stockfish removing killer moves in move ordering? by Paul Jérôme--Filio,CCC, June 24, 2024 »Search

Blog Posts

Stockfish Blog

2014

One chess champion per laptop byRoberto Perez-Franco,MIT's The Tech, January 15, 2014 »TCEC Season 5

2015 ...

And then there were two byJohn Hartmann,ChessBase News, June 09, 2015 »Komodo,Stockfish
Depth of Satisficing byKen Regan,Gödel's Lost Letter and P=NP, October 06, 2015 »Depth,Match Statistics,Pawn Advantage, Win Percentage, and Elo,Stockfish,Komodo^[45]
A Chess Firewall at Zero? byKen Regan,Gödel's Lost Letter and P=NP, January 21, 2016
Stockfish 8, November 01, 2016
Stockfish 9, February 09, 2018
Stockfish 10, December 01, 2018

2020 ...

Stockfish 11, The Stockfish Team, January 15, 2020
Introducing NNUE Evaluation, August 07, 2020
Stockfish 12, The Stockfish Team, September 02, 2020
Stockfish 13, The Stockfish Team, February 19, 2021
Stockfish 14, The Stockfish Team, July 02, 2021
Our lawsuit against ChessBase, The Stockfish Team, July 20, 2021 »ChessBase,Fat Fritz 2,Houdini 6
Stockfish 14.1, The Stockfish Team, October 28, 2021