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currentKomodo 10.3
on saleKomodo 9
freeKomodo 8

Komodo 10.3


"I am deeply moved by the style of Komodo. In my opinion it's the perfect combination between computer accuracy and human positional understanding. I get the feeling it's taken positional understanding to the next level. After such an impressive performance I am going to test Komodo in my future work, especially in very positional play, and am really looking forward to working with it."

- GM Boris Avrukh

"I am extremely impressed by Komodo's play. I watched and analyzed every game and it was absolutely flawless positional chess, the likes of which has never been seen before by an engine... or human. Komodo clearly outplayed the other programs in the TCEC tournament."

- GM Roman Dzindzichashvili

The 2016 World Computer Chess Champion!!

Komodo is a three-time TCEC champion and current World Computer Chess Champion. Version 10.3 is an improved version of the one that recently won both the 2016 World Computer Chess Championship (despite a 50 to 1 hardware disadvantage vs. its main rival) and the 2016 World Software Chess Championship. Komodo 10.3 is an improvement over the version that won the 2016 World Rapid Computer Chess Championship with an incredible 97% score. It also defeated a strong grandmaster by 3 to 1 despite giving him a two pawn handicap.

Komodo mastermind GM Larry Kaufman introduces Komodo 10.3, 2016 World Champion edition

[Dec 21, 2016] We have just released Komodo 10.3. It is about 30 elo stronger than Komodo 10.2, 50 elo stronger than Komodo 10, and about 100 elo stronger than Komodo 9. Komodo 10.3 is free for those with active subscriptions. Non-subscribers may order it at full price, or, if they have purchased Komodo 9 or later, at a 20% discount.

What is the 'Komodo 10.3 + one year subscription'?

This option is for chess players who need the strongest possible engine. We release updates to Komodo three to five times per year. The subscription is basically Komodo 10.3 plus these 3-5 updates for a discount.

What you get you get:

1) Komodo 10.3 + all new versions of Komodo we publish within one year of your order.
2) As an added bonus all previous version of Komodo.

Note: Komodo 10.3 is available for immediate download after purchase. Log in to My Account to download.

Compatable GUIs

- Chessbase
- Fritz
- Aquarium
- Chess Assistant
- Hiarcs Chess Explorer
- Shredder (Classic)
- Arena

System requirements

Minimum: Pentium III 500 MHz, 102 MB ram

Operating system: Windows, Linux, Mac OSX 10.5.8 or higher, (Android version available only from Google).

(note: Komodo does not include a 'chessboard'. See Installation instructions.)


Komodo is three-time TCEC champion, the most prestigious online computer chess event, and has also won several CCT events and several World Championships. Komodo has won a four game match giving various substantial handicaps to World Champion Candidate and then-U.S. Champion Hikaru Nakamura in two hour long games.

Komodo supports Syzygy tablebases and is available for Windows, Linux, Mac and Android.



  •  Evaluation developed by a Grandmaster
  •  Multi-core support (up to 64 cores)
  •  Syzygy endgame tablebase support
  •  Fischer Random Chess support
  •  'Persistent Hash' lets you save Komodo's analysis of a position so you can come back later and resume analysis, saving you time
  •  'Dynamism' lets you control how willing Komodo will be to make long-term sacrifices of material or pawn structure for dynamic play.
  •  'Progress Threshold' (new) lets you control how quickly Komodo starts to worry about the fifty-move rule.

Change log

Komodo 10.3 (Dec. 21, 2016)
  • Better evaluation of king and pawn endgames
  • Revised LMR and IID
  • Speedups
  • Improved MP performance
  • History changes and move order improvements
  • Revised Pruning and Singular Extension
  • Many changes to Null Move
Komodo 10.2 (Oct. 29, 2016)
  • New Eval terms and revised Eval values
  • Better assessment of mobility/activity
  • More weight on king safety and attack
  • Revised LMR
  • Several speedups
  • Improved time management
  • Revised check extension
  • History changes
  • Bugfixes
  • Revised definition of candidate passed pawn
  • Move order improvements
  • Better pin handling
  • Revised pawn structure
  • Revised Pruning
  • Major changes to material evaluation
  • Revised stage weights
  • Many changes to Null Move
  • Faster Windows compile
Komodo 10.1 (July 21, 2016)
  • Added 'Progress Threshold', a UCI option which specifies how many plies must go by without capture or pawn move before Komodo starts pulling the score towards a draw.
  • Added 'Null Scale', a UCI option which controls how aggressively Komodo uses Null Move. Higher values make Komodo search deeper but miss more.
  • Improved use of Syzygy Tablebases.
  • Many changes to Null Move.
  • Many changes to LMR.
  • Revised values for several parameters.
  • Revised extensions.
  • Revised move-count pruning.
  • Revised quiescence search.
    Komodo 10 (May 18, 2016)
    • Added 'Magnify', a UCI option which multiplies the final eval by the given percentage
    • Revised Pawn Storm
    • Revised Extensions
    • Raised Dynamism default
    • Revised King Safety
    • Revised LMR
    • Revised Contempt
    • Adjusted Null Move constants
    • Revised IID
    • Revised History
    • Edited documentation

    Komodo 9.4 (March 18, 2016)
    • (new UCI parameter) 'Contempt for White' makes Contempt useful for analysis, by consistently assigning contempt to one color rather than to the player on move.
    • (new UCI parameter) 'Dynamism' gives the user control over how actively Komodo will play (at the expense of long-term factors).
    • Many search changes
    • MP changes
    • Speedups
    • New eval terms
    • Improved King Safety
    • Improved passed pawn scoring

    Komodo 9.3 (November 26, 2015)
    • As usual, the gains come from many areas. Many eval weights were re-tuned, some free speedups were found, lmr was refined, and a change was made to MP search. The readme file has more details.
    • Revised Contempt
    • Improved Selectivity
    • Tuning many eval terms plus some new ones
    • Several MP changes
    • Better time management
    • Stricter extension rules

    Komodo 9.2 (August 21, 2015)
    • New Contempt replaces Drawscore
    • Major re-tuning of most eval and many search parameters
    • Improved in time management
    • Improved move-ordering
    • Increased weight on all "dynamic" terms

    Komodo 9.1 (June 20, 2015)
    • Komodo searches faster due to optimizations in the program's code
    • Detailed improvements (for those of you ultra-technical chess engine geeks who want to see what's changed under the hood: New Endgame term, Revised LMR rules, Re-tuned eval terms, More efficient hash table, Revision to King Safety, Improved MP scaling, Improved trade-down incentives, Revised Selectivity Default, Improved Persistent Hash, Better fen position parser

    Komodo 9 (May 6, 2015)
    • Komodo was modified to ignore GUIs that repeatedly send the same commands. This was done to deal with the Aquarium GUI, which sends repeatedly sends Chess 960 commands with each new move. When receiving this command, Komodo 9 thinks the game type is changing, and clears its hash table, which reduces play quality.
    • The sudden death time control was improved.
    • The Windows 32 bit compile was modified to properly handle multiple threads.

    Note to people who purchased Komodo 9, 9.1, 9.2, 9.3, or 9.4 on komodochess.com: Thanks for your continued support. You get a 20% discount. The discount is applied during checkout.
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