CCRL Challenger

This site allows you to play against 640 different chess engine opponents in your browser.
All engines are open-source engines taken from the CCRL (Computer Chess Rating List)

Limitations:
  • Engines have been tested but reliability cannot be guaranteed.
  • A maximum of 5 seconds computer move time is allowed
  • Engines are set to run on a single thread and use a 32MB hash table

    1 game(s) in progress.- View Active Games

    Total engine opponents:640
    Total unique engines:151

    Showing strongest versions of engines, sorted by rating.

    Show strongest versions only (Sort by release date)

    Show complete list (Sort by release date)

    Show engines rated below 2000

    Select opponent

    Play Against Random Engine
    RankNameRatingRelease Date
    #1Stockfish 17 64-bit 8CPU38172024-02-24
    #2Obsidian 14.0 64-bit 8CPU37882024-10-22
    #3Berserk 13 64-bit 8CPU37852024-03-31
    #4Alexandria 7.1.0 64-bit 8CPU37792024-10-26
    #5Caissa 1.21 64-bit 8CPU37722024-10-27
    #6PlentyChess 2.1.0 64-bit 8CPU37702024-07-02
    #7Lizard 11.2 64-bit 8CPU37692025-01-08
    #9Starzix 6.0 64-bit 8CPU37642024-10-24
    #10RubiChess 20240817 64-bit 8CPU37632024-08-17
    #11Viridithas 15.0.0 64-bit 8CPU37562024-10-13
    #12Clover 8.0 64-bit 8CPU37542024-09-02
    #13Stormphrax 6.0.0 64-bit 8CPU37442024-10-29
    #14Velvet 8.1.0 64-bit 8CPU37412024-10-28
    #16Igel 3.6.0 64-bit 8CPU37372024-12-28
    #18Seer 2.8.0 64-bit 8CPU37312023-12-31
    #21Koivisto 9.0 64-bit 8CPU37162023-01-15
    #22Peacekeeper 3.01 64-bit 8CPU37062024-06-14
    #26Altair 7.0.0 64-bit 8CPU36702024-02-17
    #27Black Marlin 9.0 64-bit 8CPU36592024-02-28
    #28akimbo 1.0.0 64-bit 8CPU36492022-11-21
    #30Quanticade Chimera 1.2 64-bit36232025-01-06
    #32Smallbrain 7.0 64-bit 8CPU36052023-01-29
    #34-35Equisetum 1.0 64-bit35782024-03-15
    #37Ethereal 12.75 64-bit 8CPU35732020-10-09
    #40Renegade 1.1.0 64-bit35622024-06-26
    #40Quanticade Electra 0.9 64-bit35572024-10-26
    #41-42Halogen 12 64-bit35432022-10-25
    #41-42Willow 4.0 64-bit35432024-02-04
    #43Rice 8.0.0 64-bit35422024-03-18
    #44-45Carp 3.0.1 64-bit35382023-09-24
    #44-45pawn 3.0 64-bit35382024-01-12
    #46Superultra 2.0 64-bit35372024-02-02
    #48Reckless 0.7.0 64-bit35032024-08-23
    #50Winter 4.0 64-bit34942024-06-29
    #51Xiphos 0.6 64-bit 8CPU34912019-11-07
    #52Midnight 9 64-bit34892024-01-21
    #54Marvin 6.3.0 64-bit34702024-05-25
    #55-56Quanticade Aurora 0.8 64-bit34682024-08-23
    #55-56Zahak 10.0 64-bit 8CPU34682022-05-08
    #58Combusken 2.0.0 64-bit 8CPU34662022-01-15
    #58Devre 4.0 64-bit34632022-08-23
    #60BlackCore 6.0 64-bit34552023-03-02
    #61Weiss 2.0 64-bit 8CPU34542021-08-04
    #61Clarity 4.0.0 64-bit34532023-12-31
    #62Molybdenum 4.1 64-bit34482024-11-05
    #62Laser 1.7 64-bit 8CPU34452019-02-07
    #66Pedantic 2.1.0 64-bit34182024-09-30
    #69Avalanche 2.1.0 64-bit34052023-09-24
    #72Defenchess 2.2 64-bit 4CPU33862019-08-23
    #73Counter 5.5 64-bit33812024-01-12
    #75Frozenight 6.0.0 64-bit33772023-01-19
    #78Nalwald 19 64-bit33562024-07-11
    #78Zangdar 2.31 64-bit33352024-11-15
    #80Odonata 1.0 64-bit33252024-07-22
    #85-86Princhess 0.19.0 64-bit33002024-09-29
    #88Leorik 3.0 64-bit32822024-02-05
    #88RukChess 3.0.15 64-bit32742022-09-06
    #89Svart 6 64-bit32692023-08-25
    #89Minic 3.06 64-bit32642021-05-02
    #89Drofa 4.0.0 64-bit32462023-05-25
    #91Vajolet2 2.8 64-bit 4CPU32442019-11-01
    #93Cadie 2.0 64-bit32232024-10-28
    #96Lambergar 1.0 64-bit32132025-01-14
    #99Arcanum 2.4 64-bit32012024-11-30
    #101Priessnitz 2.0 64-bit31942024-11-03
    #102Jet 1.2 64-bit31672024-03-22
    #102Toga III 0.2 64-bit31652021-01-10
    #105-106Lynx 1.8.0 64-bit31562024-12-20
    #105-106Mr Bob 1.1.0 64-bit31452021-11-30
    #105-106Mantissa 3.3.0 64-bit31442022-01-10
    #108Monolith 2 64-bit 4CPU31422018-11-06
    #108Patricia 2.0 64-bit31392024-04-03
    #109Amoeba 3.1 64-bit 4CPU31262020-01-16
    #110Illumina 2.0 64-bit31222024-11-24
    #111FabChess 1.15 64-bit 4CPU31192020-05-22
    #112MIDA 2.3 64-bit31172023-12-14
    #113bitbit 1.2 64-bit31042024-04-29
    #114Bit-Genie 9 64-bit30982021-08-21
    #115Wahoo 4.0.0 64-bit30962023-08-31
    #116Simbelmyne 1.9.0 64-bit30912024-07-08
    #121monty 1.0.0 64-bit30702024-05-28
    #124-125Polaris 1.8.1 64-bit30532023-06-25
    #129Inanis 1.5.0 64-bit30012024-11-01
    #132Pingu 4.0.0 64-bit29912024-08-11
    #133Puffin 5.0 64-bit29882024-11-25
    #135Seawall 20240926 64-bit29542024-09-26
    #137Jackal 1.0.0 64-bit29482024-12-04
    #148Weiawaga 5.0 64-bit28772022-04-23
    #150Dumb 2.1 64-bit28262024-04-13
    #153Belette 3.0.0 64-bit28112024-03-28
    #156-157Yakka 1.1 64-bit27932024-09-16
    #158Mess 0.3.0 64-bit27792023-05-31
    #159Javelin 3.0.0 64-bit27742024-07-16
    #163-164Aramis 1.4.0 64-bit27592024-09-02
    #165K2 0.9927542021-01-01
    #178-179Lux 4.2 64-bit26882024-04-04
    #180Bread 1.2.0 64-bit26852025-01-04
    #181Supernova 2.4 64-bit26792021-09-14
    #182Blunder 8.0.0 64-bit26512022-06-30
    #189Euwe 2.0.0 64-bit26382024-12-07
    #190-191WyldChess 1.51 64-bit26052017-07-03
    #199Raven 1.30 64-bit25612023-01-09
    #200Luna 2.0.0 64-bit25572023-09-24
    #208Fatalii 0.8.0 64-bit25072024-10-17
    #215FoxSEE 8.2 64-bit24752022-07-15
    #219Cosette 5.1 64-bit24402021-06-07
    #221MinimalChess 0.6 64-bit24362021-08-29
    #222-223Anka 0.6.3 64-bit24242021-12-07
    #222-223Loki 3.0.0 64-bit24242021-04-13
    #224-225Kimbo 1.0.0 64-bit24232022-11-21
    #230SoFCheck 0.9 beta 64-bit23812022-02-06
    #234Teki 1 64-bit23632018-03-08
    #235Oxidation 0.7.1 64-bit23572024-05-07
    #252Kingfisher 1.0 64-bit22362018-10-24
    #253GOOB 1.0.0 64-bit22292022-05-04
    #254Stellar 1.3.0 64-bit22152024-03-11
    #255Napoleon 1.8 64-bit22042017-06-28
    #256Camel 1.6.0 64-bit21982024-06-08
    #257MORA 1.1.0 64-bit21892019-11-17
    #263Zagreus 5.0 64-bit21682024-03-18
    #266-267Shuffle 5.2.0 64-bit21642024-02-03
    #266-267chessplusplus 1.2.0 64-bit21642023-11-02
    #270-271KhepriChess 4.0.0 64-bit21442023-06-01
    #274Horowitz 2.2.0 64-bit21132022-06-03
    #275Trinket 3.0.0 64-bit21072022-10-05
    #279-280Halcyon 1 64-bit20992023-07-25
    #285Infrared 2.0.1 64-bit20772022-09-19
    #286Eggnog 5 64-bit20742022-10-18
    #294BBC 1.1 64-bit20192020-09-29
    #306Captain 4.0 64-bit19602023-03-12
    #307Cadabra 2.0.0 64-bit19592023-06-07
    #326Thrawn 1.1 64-bit18942023-12-28
    #330Snowy 0.2 64-bit18792018-01-12
    #331-333Lunarr 2.0.1 64-bit18782024-01-17
    #335Freda 0.99 64-bit18632023-09-15
    #337Amelia 0.15 64-bit18592024-10-06
    #344Neuromancer 1.5 64-bit18272024-09-20
    #349Rustic Alpha 3.0.0 64-bit17942023-03-28
    #351Tofiks 1.3.0 64-bit17882023-10-22
    #358Leandor 1.2 64-bit17352022-02-17
    #369Apollo 1.2.1 64-bit16692018-06-09
    #370Chers 0.8.0 64-bit16632023-11-08
    #375Lumac0 14.0 64-bit15932022-09-06
    #378Shallow Blue 2.0.0 64-bit15752019-01-16
    #386FracTal 1.0 64-bit15112020-06-19
    #388Magog 1.0 64-bit14952024-06-26
    #405DoctorB 1.2.1 64-bit13282021-06-10
    #411Radiance 3.4 64-bit13062024-12-25
    #434Mufasa 0.2.1 64-bit10982024-07-31
    #438Catto 0.12.6 64-bit10162024-07-28
    #448Delimiter 0.1.1 64-bit6882021-06-13
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