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Stockfish (Computer)
Number of games in database: 366
Years covered: 2009 to 2018
Overall record: +47 -80 =239 (45.5%)*
   * Overall winning percentage = (wins+draws/2) / total games.

Repertoire Explorer
Most played openings
E15 Queen's Indian (25 games)
E17 Queen's Indian (12 games)
C67 Ruy Lopez (12 games)
A17 English (11 games)
C11 French (10 games)
C65 Ruy Lopez, Berlin Defense (8 games)
A10 English (7 games)
C02 French, Advance (6 games)
E21 Nimzo-Indian, Three Knights (6 games)
E16 Queen's Indian (6 games)

   🏆 AlphaZero - Stockfish Match
   Stockfish vs AlphaZero (Jan-18-18) 0-1
   Stockfish vs AlphaZero (Jan-18-18) 1/2-1/2
   AlphaZero vs Stockfish (Jan-18-18) 1/2-1/2
   AlphaZero vs Stockfish (Jan-18-18) 1/2-1/2
   Stockfish vs AlphaZero (Jan-18-18) 1-0

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(born 2008) Norway

[what is this?]

Stockfish originated as a fork of Tord Romstad's Glaurung (Computer), improved by Marco Costalba, Romstad and Joona Kiiski. It is now developed by the Stockfish community, using Gary Linscott's Fishtest testing framework to test new code.

As of 2016, Stockfish is one of the two strongest chess engines in the world, with Komodo (Computer), and the strongest open-source engine. It won TCEC season 6 in 2014, defeating Komodo in the superfinal.

Stockfish runs on Linux, Windows or Mac OS X platforms, as well as mobile platforms such as the iPhone, iPad and iPod touch. Various installations have supported set-ups such as 8 Gbytes for a hashtable with an 8-core processor under its UCI protocol.

Official website:

SmallFish app for iPad/iPhone with iOS 8.0 or later:

SmallFish for iOS 6:

Stockfish 2.0.1, operated by User: kutztown46, played in the Masters - Machines Invitational (2011) as Kutztown46 / Stockfish.

Wikipedia article: Stockfish (chess)

Last updated: 2018-12-03 07:10:17

 page 1 of 15; games 1-25 of 366  PGN Download
Game  ResultMoves YearEvent/LocaleOpening
1. Stockfish vs Rybka 0-17820093rd WCRCCD14 Queen's Gambit Declined Slav, Exchange Variation
2. Stockfish vs Crafty  1-0742013nTCEC - Stage 1A10 English
3. Stockfish vs Rybka  1-0662013nTCEC - Stage 1B53 Sicilian
4. Stockfish vs Critter  ½-½672013nTCEC - Stage 2aA10 English
5. Critter vs Stockfish ½-½562013nTCEC - Stage 2aA10 English
6. Stockfish vs Rybka  0-1532013nTCEC - Stage 3B33 Sicilian
7. Stockfish vs Chiron  1-0522013nTCEC - Stage 3C12 French, McCutcheon
8. HIARCS vs Stockfish 0-1542013nTCEC - Stage 3A52 Budapest Gambit
9. Stockfish vs Rybka 1-0422013nTCEC - Stage 4B03 Alekhine's Defense
10. Houdini vs Stockfish  0-1872013nTCEC - Stage 4C18 French, Winawer
11. Rybka vs Stockfish  ½-½422013nTCEC - Stage 4B03 Alekhine's Defense
12. Stockfish vs Houdini  0-1762013nTCEC - Stage 4 - Season 1C70 Ruy Lopez
13. Stockfish vs Houdini  ½-½612013nTCEC - Superfinal - SeasonD45 Queen's Gambit Declined Semi-Slav
14. Houdini vs Stockfish  ½-½412013nTCEC - Superfinal - SeasonD45 Queen's Gambit Declined Semi-Slav
15. Houdini vs Stockfish 1-0532013nTCEC - Superfinal - SeasonD98 Grunfeld, Russian
16. Stockfish vs Houdini ½-½872013nTCEC - Superfinal - SeasonE12 Queen's Indian
17. Houdini vs Stockfish ½-½692013nTCEC - Superfinal - SeasonE15 Queen's Indian
18. Stockfish vs Houdini  ½-½562013nTCEC - Superfinal - Season 1D99 Grunfeld Defense, Smyslov
19. Stockfish vs Houdini  ½-½602013nTCEC - Superfinal - SeasonE04 Catalan, Open, 5.Nf3
20. Houdini vs Stockfish  1-0672013nTCEC - Superfinal - SeasonE04 Catalan, Open, 5.Nf3
21. Stockfish vs Houdini ½-½1092013nTCEC - Superfinal - Season 1B04 Alekhine's Defense, Modern
22. Houdini vs Stockfish  ½-½602013nTCEC - Superfinal - Season 1B04 Alekhine's Defense, Modern
23. Houdini vs Stockfish  ½-½802013nTCEC - Superfinal - SeasonC14 French, Classical
24. Stockfish vs Houdini  ½-½472013nTCEC - Superfinal - SeasonA10 English
25. Houdini vs Stockfish 1-0792013nTCEC - Superfinal - SeasonA10 English
 page 1 of 15; games 1-25 of 366  PGN Download
  REFINE SEARCH:   White wins (1-0) | Black wins (0-1) | Draws (1/2-1/2) | Stockfish wins | Stockfish loses  

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 12 OF 12 ·  Later Kibitzing>
Dec-07-17  WorstPlayerEver: <frogbert>

Sure enough S8 has trouble to find this moves: it goes beyond their evaluation. Which is traditionally still too based on materialistic grounds. It doesn't recognize the pattern of the position. Which comes down to King safety.

My objection stands corrected though, I think. The Black S8 positions are often more than just passive. Withdrawn is an appropriate term, I suppose.

The e5 vs c6/e6 ingredient/locked Black LSB/king side attack, White Queen has hands free/open d-file for White.

All managed through nice pawn sacs.

It's almost like sac sac mate ;)

Dec-07-17  john barleycorn: I have a strong feeling that the whole thing was manufactured in one way or the other. Has Kasparov been involved?
Dec-07-17  frogbert: <Hence, we're left with the line 23... Qh6 24. Re8 Qf6 25. Rae1 Kg8 26. Rxf8+ Qxf8 27. Qd4! and white is again winning.>

And here, my Stockfish doesn't find the important move 27. Qd4 within one minute - and Qd4 actually works due to a second piece sacrifice (Bd5+). :)

I hope everyone realizes that AlphaZero also does a tree search during play - MCTS or Monte Carlo Tree Search simulations - which is more costly for each node in the tree; hence, the huge difference in number of positions examined per second between AZ and S.

Premium Chessgames Member
  Marmot PFL: Komodo seemed listless and out of form in some games against Houdini too. Even computers have bad days I suppose, and the programmers go through the opponents games, looking for weaknesses to exploit.
Dec-07-17  WorstPlayerEver: <frogbert>

You are right. I proved very little today.

But hey, except from rather cramped opening ideas, I always stated there's -far- more to chess than everyone thought. My infectuous optimism may well have contributed to this h.. I mean revolutionary developments. Who knows.

Or maybe I am a little on the narcissistic side?

Premium Chessgames Member
  Domdaniel: <Worst> That's good. It's only when you reach the *very* narcissistic point, where optimism is quashed, that things get problematic.
Premium Chessgames Member
  keypusher: < WannaBe: I have only (quickly) played game 1 from the PDF file, so a quick glance at FEN of game 5 - move 20, I see similarity to game 1: 1. White have no center pawn(s)
2. (Somehow) black got its pieces in the A8 corner(?!!?)

Don't think any human player would get him/herself into that kind of position...>

Kasparov vs Marjanovic, 1980

Jan-10-18  scholes: Current sf dev version now 50 elo stronger than sf8. Halfway to alphazero ☺️

Jan-26-18  chesslab0: Dear chessfriends, the 19th (already) FICGS correspondence chess WCH waiting list is now open, all tournaments should start on March 1st, 2018... Stockfish and Houdini are kind of required here :) ... and yes, after all these years GM Eros Riccio is still FICGS correspondence chess champion!

If you're IM or GM (basically rated over 2350) and used to chess engines, you may get the opportunity to enter the knockout tournament to reach the candidates final. We really need the participation of the strongest corr. chess players to shake the crown, join the fun :)

You can replay the games of the 14th WCH final match here:

By the way, for more convenience FICGS now has applications for Android that you can find here:

Feb-01-18  scholes: Stockfish 9 released. 60 elo stronger than sf8 in self test. Would be more in rating list due to new contempt in sf9. Stockfish has 20 as default contempt. Use 0 contempt for analysis unless you what it does.
Premium Chessgames Member
  zanzibar: SF download page:

Apparently an early release got out, somewhat mistakenly:

(Thanks <scholes> for that tip - but aren't the parameter settings the responsibility of whatever UCI interface one is using?)

Premium Chessgames Member
  zanzibar: Oh, wait, the engines can be run stand-alone too, though I rarely do that.

Was the contempt setting then changed between v8 and v9?

Feb-03-18  scholes: Yes in jan 2018 it was changed from 0 to 20. Largest contempt value which doesn't causes regression.

No you a chess hui does not change uci parameters by default. Only a user can change it.

Premium Chessgames Member
  zanzibar: <scholes> I run SCID, and it's gui has a UCI configure engine dialogue box.

When I run it with SF9 it comes up with Contempt = 0.

Is there any method for testing what Contempt setting an engine really is running with other than looking at the UCI configure window?

PS- I disagree with the statement that only a user can change it - as the gui's can store settings and send them to the engine at startup. I haven't looked at the details of the code - so I don't exactly who does what, when.

Premium Chessgames Member
  zanzibar: <scholes> Apologies - but my previous post is in error, probably because I didn't properly do the SF8 to SF9 upgrade.

Redoing it you were right, the SF9 engine does have the new Contempt setting by default when first starting. SCID's UIC config dialog can be used to reset it, and thereafter use the new setting (I put it back to 0).

Again, apologies.

Premium Chessgames Member
  HeMateMe: stock up!

<Stockfish is the winner of the Top Chess Engine Championship (TCEC) Season 11. The open source engine by Marco Costalba, Joona Kiiski, Gary Linscott and a huge community of contributors, defeated last year’s champion Houdini and crowned itself the new Grand Champion of the competition.

This is the third title for Stockfish, after the victories in Season 6 and Season 9. However, this time Stockfish created history by winning the title in a one of a kind landslide victory. After 85 games Stockfish had the necessary 50,5 points (18 victories, 65 draws, and only two losses), with 15 games to spare the title was in the hands of the open source engine.>

Premium Chessgames Member
  Penguincw: Love the profile pic.

Stockfish 9 recently played a match on vs. Neural Network AI Leela Chess Zero ID:185, which is similar to AlphaZero.

Here are the games and more:

May-18-18  oolalimk1: in the last 21 games here Stockfish did not win a single game.
Premium Chessgames Member
  Penguincw: Norwegian Stockfish 160518 finishes tied for 1st at the TCEC Season 12 - Premier Division tournament, with 24.5/39.

Nov-30-18  WorstPlayerEver: Congrats on your 10th anniversary!
Nov-30-18  scholes: sf 10 released

Dec-10-18  Telemus: Stockfish is quite strong, but it seems to be difficult to analyse with it. See what I mean.

SF 10 evaluates the starting position at depths 25-30 as favouring White: at least +0.57. But if I execute its favourite move (e4), then - at the same depths - the evaluation is close to 0.00, several times even negative. The same observation holds for many opening positions and I oberved it already with SF 9.

Did anybody else notice that SF enjoys to have the move so much? And how shall I analyse with it?

I also like evaluation profiles of whole games (e.g. But if I use SF for evaluation it varies from ply to ply so often by 50+ centipawns, although the best move was played. In these cases the impression one gets from the profile is absolutely misleading.

Premium Chessgames Member
  zanzibar: <<Telemus> Did anybody else notice that SF enjoys to have the move so much? And how shall I analyse with it?>

I've made similar observations/comments several times in the past.

It's misleading because of aggressive adaptive pruning, or so I believe, where SF seems to be getting stuck in a local min/max.

Playing a given move forces it to explore that move to a similar depth, seeding the cache properly, if returning to original position.

Some people have suggested not trusting SF at least than a depth of 40-ply or more, which puts it outside the powerband of my laptop for definitive analysis.

I still use it, put try to walk through the actual game moves to seed a position before letting it really simmer the pot/position.

Dec-10-18  Molotok: <Telemus> This is a feature called contempt which adds some amount of centipawns to evaluation so that the engine tries to avoid draws by picking slightly "worse" positions that let the game continue. It was to counter the old weakness of SF8 that had the tendency to quickly accept draws against much weaker opponents and was introduced in SF9. I think you can at least turn it off for analysis by switching "analysis contempt" option to "off".
Dec-11-18  Telemus: <zanzibar> <Molotok> Thank you very much for your replies!

<Molotok: contempt> That worked!

Stockfish describes the parameter as follows:
<option name Contempt type spin default X min -100 max 100> where X = 24 for SF10, X = 20 for SF9, and X = 0 for SF8. (Looks like the default behaviour for analysis vs play was changed from SF8 to SF9.)

In my old Chessbase GUI one can set this parameter during engine installation (it failed to change it for an existing engine).

In general, a GUI has to send the UCI command
<setoption name Contempt value 0> to Stockfish.

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