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Stockfish (Computer)
Number of games in database: 156
Years covered: 2009 to 2017

Overall record: +34 -28 =90 (52.0%)*
   * Overall winning percentage = (wins+draws/2) / total games in the database. 4 exhibition games, blitz/rapid, odds games, etc. are excluded from this statistic.

With the White pieces:
 Sicilian (12) 
    B40 B32 B33 B80 B90
 English (5) 
    A10 A18
 French Defense (5) 
    C02 C11 C12 C14
 Ruy Lopez (5) 
    C65 C84 C70 C86
With the Black pieces:
 Sicilian (11) 
    B40 B30 B43 B99 B22
 French Defense (9) 
    C11 C02 C14 C07 C05
 Queen's Indian (9) 
    E17 E15 E16 E12
 English (4) 
    A10 A18
 Nimzo Indian (4) 
    E32 E27 E21
Repertoire Explorer

NOTABLE GAMES: [what is this?]
   Stockfish vs Jonny, 2014 1-0
   Stockfish vs Rybka, 2013 1-0
   Stockfish vs Critter, 2014 1-0
   Komodo vs Stockfish, 2014 0-1
   Houdini vs Stockfish, 2013 0-1
   Stockfish vs Rybka, 2013 1-0
   Houdini vs Stockfish, 2013 0-1
   Komodo vs Stockfish, 2014 1/2-1/2
   Stockfish vs Komodo, 2014 1/2-1/2
   Stockfish vs Houdini, 2013 1-0

NOTABLE TOURNAMENTS: [what is this?]
   Stockfish Nakamura Match (2014)

GAME COLLECTIONS: [what is this?]
   Engine Brilliancies by Zhbugnoimt
   scholes' favorite games by scholes
   nTCEC Computer Chess Tournament by shoshonte

   Battle of the Brains II, 2008
   Battle of the Brains 3, 2009
   Team White vs Team Black, 2013
   Team White vs Team Black, 2017
   D Byrne vs Fischer, 1956

   🏆 AlphaZero - Stockfish
   AlphaZero vs Stockfish (Dec-04-17) 1-0
   AlphaZero vs Stockfish (Dec-04-17) 1-0
   AlphaZero vs Stockfish (Dec-04-17) 1-0
   AlphaZero vs Stockfish (Dec-04-17) 1-0
   AlphaZero vs Stockfish (Dec-04-17) 1-0

Search Sacrifice Explorer for Stockfish (Computer)
Search Google for Stockfish (Computer)

(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.

Last updated: 2017-07-16 00:42:57

 page 1 of 7; games 1-25 of 156  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. Stockfish vs Houdini  ½-½562013nTCEC - Superfinal - Season 1D99 Grunfeld Defense, Smyslov
16. Houdini vs Stockfish 1-0532013nTCEC - Superfinal - SeasonD98 Grunfeld, Russian
17. Stockfish vs Houdini ½-½872013nTCEC - Superfinal - SeasonE12 Queen's Indian
18. Houdini vs Stockfish ½-½692013nTCEC - Superfinal - SeasonE15 Queen's Indian
19. Houdini vs Stockfish  ½-½602013nTCEC - Superfinal - Season 1B04 Alekhine's Defense, Modern
20. Stockfish vs Houdini  ½-½602013nTCEC - Superfinal - SeasonE04 Catalan, Open, 5.Nf3
21. Houdini vs Stockfish  1-0672013nTCEC - Superfinal - SeasonE04 Catalan, Open, 5.Nf3
22. Stockfish vs Houdini ½-½1092013nTCEC - Superfinal - Season 1B04 Alekhine's Defense, Modern
23. Stockfish vs Houdini ½-½592013nTCEC - Superfinal - SeasonC14 French, Classical
24. Houdini vs Stockfish  ½-½802013nTCEC - Superfinal - SeasonC14 French, Classical
25. Stockfish vs Houdini  ½-½472013nTCEC - Superfinal - SeasonA10 English
 page 1 of 7; games 1-25 of 156  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  frogbert: <The latter is an obvious blunder which S8 not even considers.

It plays 21. Bg5 f5 22. Qf4 hxg5>

And what does S8 do for black after 23. Nxg5, <WorstPlayerEver>?

23... Qxh5 loses to 24. g4!
23... Qg8 loses to 24. h6!

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.

Got any improvements for black here?

Dec-07-17  frogbert: (For some reason Stockfish has an issue with finding 24. g4! too - I don't know why.)

In short, it certainly doesn't look like 22... Nc5 was a blunder - rather black's best option in the position. But Stockfish realized too late that it was in trouble after Bg5! - possibly due to the enforced time restriction of exactly 1 minute per move.

Premium Chessgames Member
  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...

Dec-07-17  WorstPlayerEver: 21. Bg5 f5 22. Qf4 hxg5 23. Nxg5 Qxh5 24. g4 and Black is completely lost. Again. And I see no improvement.

But it proves my point; S8 does not play 21... Nc5 afaik

And a lot of other moves. I assume that AlphaZero actually played these moves and it all looks very interesting and brilliant indeed. I am the last to deny. There's really something interesting going on.

However, I question the presentation of the facts. Because it's possible to filter out these variations and apply a different approach to them while programming. A testcase. So to speak.

Besides, if I were so brilliant, I'd be the first to come up with all info=100 games and not 10. Why hesitate?

So I guess we are repeating moves ;)

Dec-07-17  frogbert: In game 9, AlphaZero plays a rather brilliant positional piece sacrifice, with 30. Bxg6!! It takes Stockfish several moves after the sac to realize that it has become (much) worse - even a piece up.

There's a similar theme in game 7 where black's bishop ends up being utterly useless on b7 and a8, making black practically play a piece down in the deciding moments of the game.

Dec-07-17  frogbert: <But it proves my point>

It proves nothing of the sort: There are various builds of S8 around, your cache-state may have an impact, there are lots of tweakable engine parameters, and its performance (and choices) also depends on the hardware configuration.

By playing around, I've seen that Stockfish seems to struggle with finding some of the refutations of its own moves - while AlphaZero did. Only after I help Stockfish with the right idea, does it change its opinion.

My only "beef" with the comparison in the article, is that they imposed restrictions on Stockfish that are particularly harmful for depth-first approaches; in order to do selective depth-first well, the program needs to be able to manage its own time (within normal time controls, of course).

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.

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