Komodo 12.1.1

"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

Introducting the all new Komodo, Komodo MCTS

Komodo 12 MCTS thinks like no other chess engine in the world. Inspired by the ideas of AlphaZero and Leela, Larry and Mark set out to reinvent Komodo. What they came up with was Komodo 12 MCTS - a engine which searches for candidate moves in an incredible new way, and finds moves no other engine can!?

Komodo is a three-time TCEC champion and current World Computer Chess Champion. Komodo 12 is an improved version of the one which won both the 2017 World Computer Chess Championship (despite a 40 to 1 hardware disadvantage vs. its main rival) and the 2017 World Blitz Software Chess Championships. Komodo 12 is an improvement over the version that won the 2017 World Rapid Computer Chess Championship with an incredible 96% 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 12

[May 14, 2018] We have just released Komodo 12. It is about 40 elo stronger than Komodo 11.01 and 85 elo stronger than Komodo 10 in quick games. Komodo 12 is free for those with active subscriptions. Non-subscribers may order it at full price, or, if they have purchased Komodo 11 or later, at a 20% discount. Komodo 12 comes with an option for Komodo MCTS, a very different engine that we believe is the world's strongest Monte-Carlo chess engine for the pc.

What is the 'Komodo 12 + one year subscription'?

This option is for chess players who need the strongest possible engine. We release updates to Komodo three to four times per year. The subscription is basically the current version of Komodo 12 (currently 12.1) plus these updates for a discount.

What you get:

1) Komodo 12 + 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 12 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 366 MHz, 1GB 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 games.

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



  •   'Use MCTS' (new) This "Monte Carlo Tree Search" option plays very different chess than any standard engine, still at a higher level than any human can play. It is especially useful when used together with "MultiPV".
  •  Evaluation developed by a Grandmaster
  •  Multi-core support (up to 64 cores)
  •  Syzygy endgame tablebase support
  •  Fischer Random Chess support
  •  'Variety' lets you control how likely Komodo is to make a different move at the same depth in the same position.
  •  '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.
  •  'Skill' (new) this setting allows you to weaken Komodo in 150 elo increments from ELO 200 up to 2900 (from beginner to World Champion).

Change log

Komodo 12 (May 11, 2018)
  • Added MCTS option
  • Revised time management
  • Revised King to Pawn endgame distance term
  • Revised extensions
  • Revised Ponder
  • Revised move-count pruning
Komodo 11.3 (March 5, 2018)
  • Added Skill levels for weaker play
  • Added new BMI2-optimized version
  • Revised Contempt
  • Removed useless code
  • Revised search params
  • Revised Material Value params
  • Modified Aspiration
  • Modified low pawn count scaling
  • Modified Singular Extension
  • Speedups
  • Removed generation and counting of illegal king moves
  • Removed some scalings
  • Thread changes by Jeremy Bernstein
  • Fixed a 50-move rule bug
  • Modified passed pawn values
  • Modified Null Move
  • Modified Time Management to fix too rapid play on many threads
    one new eval term
Komodo 11.2 (July 17, 2017)
  • Removed one extension
  • Retuned search terms
  • Revised LMR
  • Revised Pruning
  • Revised Null Move
  • Revised Time Management
  • Revised Contempt
  • Changed Candidate Passed Pawns
  • Changed King Safety
  • Several speedups
  • Several Bugfixes
  • Made MP more NUMA-friendly
  • Revised Windowing
  • Revised Lazy Evaluation
  • Revised check and singular extensions
  • Revised Eval Scaling
  • Raised Knight value (to narrow bishop - knight gap)
Komodo 11.01 (May 22, 2017)
  • Several new eval terms
  • Revised King Safety
  • Several speedups
  • Minor bugfixes
  • revised quiescence search
  • revised Singular Extension
  • revised MP search
  • revised LMR
Komodo 10.4 (March 14, 2017)
  • Revised LMR
  • Revised Pruning
  • Revised Extensions
  • Revised IID
  • Revised Null Move
  • Speedups
  • New Eval terms
  • Changed Mobility
  • Tuned search and eval terms
  • Improved Move ordering
  • Faster Compile for Linux
  • New UCI option "variety" lets user control likelihood of same move at same depth in same position.
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

    Note to people who purchased Komodo 10 or later version on komodochess.com: Thanks for your continued support. You get a 20% discount. The discount is applied during checkout.
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