Release Monthly Release - 2026.09 · computer-chess-index/cci

Monthly Release Summary - 2026.09

Engine	Version	Published	Author	AI usage	Bin	VT	Init	cElo _{(∆ prev) STC _8.0+0.08s}	cElo _{(∆ prev) LTC _60.0+0.60s}	cElo _{(∆ prev) VLTC _2m24s+1.12s}
_Echekinator	_1.1	_2026-09-30	_{Timothee Fixy}	_❓	_✅	_✅	_❓
_Funcomp	_1.0	_2026-09-28	_{James Coit}	_❓	_✅	_✅	_❓
_Cepimetheus	_17.0.0	_2026-09-28	_{George Bland}	_❓	_✅	_❓	_✅	2361 _{(+699) 🟩}	2682 _{(+665) 🟩}	2772 _{(+706) 🟩}
_Basilisk	_1.10.1	_2026-09-27	_{Miloslav Macůrek}	_❓	_✅	_✅	_❓
_Coco	_1.5.1	_2026-09-27		_❓	_✅	_✅	_✅	2211 _{(-54) 🟩}	2746 _{(-11) 🟩}	2876 _{(-4) 🟩}
_Ceylondemon	_3.3	_2026-09-26	_{Madushan Bhashana Dissanayake}	_❓	_✅	_✅	_✅	2957 _{(+326) 🟩}	3275 _{(+255) 🟩}	3363 _{(+222) 🟩}
_Fatpanda	_0.1.0	_2026-09-26	_{Rahul Biradar}	_❓	_✅	_✅	_✅	1300 _{(new) 🟩}	1567 _{(new) 🟩}	1582 _{(new) 🟩}
_Buster	_7.0.2	_2026-09-26	_{Anders Carlsson}	_❓	_✅	_✅	_❓
_Gyatso	_1.6.0	_2026-09-25	_{Gyatso Neesham}	_❓	_✅	_✅	_✅	3205 _{(+539) 🟩}	3418 _{(+376) 🟩}	3529 _{(+392) 🟩}
_Zigqueen	_6.3.0	_2026-09-25	_{Matthias Stier}	_❓	_✅	_✅	_❓
_Yakka	_1.6	_2026-09-24	_{Christopher Crone}	_❓	_✅	_✅	_✅	2885 _{(+134) 🟩}	3195 _{(+160) 🟩}	3259 _{(+70) 🟩}
_Justbot	_0.5.0	_2026-09-24	_{Hassan Fakih}	_❓	_✅	_✅	_✅	3428 _{(+374) 🟩}	3641 _{(+290) 🟩}	3683 _{(+276) 🟩}
_Sloth	_2.3	_2026-09-22	_{William Sjolund}	_❓	_✅	_✅	_❓
_Pasteque	_0.0.0	_2026-09-21	_{Volodymyr Shcherbyna}	_❓	_✅	_✅	_✅	275 _{(new) 🟨}	300 _{(new) 🟨}	315 _{(new) 🟨}
_Aurora	_1.28.0	_2026-09-21	_{Winston Cai}	_❓	_✅	_✅	_✅	2499 _{(+122) 🟩}	2834 _{(+137) 🟩}	2931 _{(+213) 🟩}
_AteNika	_0.7.0	_2026-09-20	_{Yevhenii Sekhin}	_❓	_✅	_✅	_✅	2765 _{(+91) 🟨}	3113 _{(+97) 🟩}	3195 _{(+45) 🟩}
_Caissa	_2.0	_2026-09-19	_{Michał Witanowski}	_❓	_✅	_✅	_❓
_Ember	_1.3.1	_2026-09-18	_{Daniel Krețu}	_❓	_✅	_✅	_❓
_Coco	_1.5.0	_2026-09-14		_❓	_✅	_✅	_✅	2265 _{(new) 🟩}	2757 _{(new) 🟩}	2880 _{(new) 🟩}
_AteNika	_0.6.0	_2026-09-13	_{Yevhenii Sekhin}	_❓	_✅	_✅	_✅	2674 _{(new) 🟩}	3016 _{(new) 🟩}	3150 _{(new) 🟩}
_Peras	_3.0.0	_2026-09-13	_{Jesse Sissala}	_❓	_✅	_✅	_✅	3345 _{(new) 🟩}	3576 _{(new) 🟩}	3641 _{(new) 🟩}
_Abc	_1.0	_2026-09-12	_{Maksym Korzh}	_❓	_✅	_✅	_❓
_USunfish	_1.4	_2026-09-12	_{Angel Monreal}	_❓	_✅	_✅	_✅	1089 _{(new) 🟩}	1462 _{(new) 🟩}	1553 _{(new) 🟩}
_Onslaught	_2.0	_2026-09-12	_{Kai Chung}	_❓	_✅	_✅	_✅	2978 _{(new) 🟩}	3279 _{(new) 🟩}	3356 _{(new) 🟩}
_Rarog	_2.4.0	_2026-09-11	_{Miloslav Macůrek}	_❓	_✅	_✅	_✅	2550 _{(new) 🟩}	2925 _{(new) 🟩}	3069 _{(new) 🟩}
_Integral	_8.0	_2026-09-11	_{Aron Petkovski}	_❓	_✅	_✅	_✅	3518 _{(new) 🟩}	3714 _{(new) 🟩}	3749 _{(new) 🟩}
_Basilisk	_1.10.0	_2026-09-10	_{Miloslav Macůrek}	_❓	_✅	_✅	_✅	2637 _{(new) 🟩}	2915 _{(new) 🟩}	3044 _{(new) 🟩}
_Chal	_2.0.0	_2026-09-08	_{Naman Thanki}	_❓	_✅	_✅	_✅	2631 _{(new) 🟩}	2943 _{(new) 🟩}	2996 _{(new) 🟩}
_Petrel	_4.1	_2026-09-08	_{Aleks Peshkov}	_❓	_✅	_✅	_✅	3104 _{(new) 🟩}	3368 _{(new) 🟩}	3452 _{(new) 🟩}
_{OutOfStockFish}	_1.0	_2026-09-08	_{Angad Basandrai}	_❓	_✅	_✅	_✅	1459 _{(new) 🟨}	1709 _{(new) 🟨}	1719 _{(new) 🟨}
_Tunguska	_2.2	_2026-09-07	_{Fernando Tenorio}	_❓	_✅	_✅	_✅	2896 _{(new) 🟩}	3224 _{(new) 🟩}	3325 _{(new) 🟩}
_Casanchess	_1.1.2	_2026-09-06	_{Carlos Sanchez Mayordomo}	_❓	_✅	_✅	_✅	2426 _{(new) 🟩}	2800 _{(new) 🟩}	2866 _{(new) 🟩}
_MangoAC	_1.2.0	_2026-09-06	_{José Andrés Morales Linares}	_❓	_✅	_✅	_✅	1805 _{(new) 🟩}	2107 _{(new) 🟩}	2186 _{(new) 🟩}
_Gaia	_4.3.0	_2026-09-05	_{Jean-Francois Romang, David Rabel}	_❓	_✅	_✅	_✅	3424 _{(new) 🟩}	3698 _{(new) 🟩}	3713 _{(new) 🟩}
_Missingpawn	₂	_2026-09-05	_{Kacper Wieczorek}	_❓	_✅	_✅	_✅	844 _{(new) 🟨}	1143 _{(new) 🟨}	1266 _{(new) 🟩}
_Stockfish	_19.0	_2026-09-05	_{Stockfish Authors}	_❓	_✅	_✅	_✅	3653 _{(new) 🟩}	3762 _{(new) 🟩}	3783 _{(new) 🟩}
_Dual	_0.4.3	_2026-09-04	_{Tomasz Stawowy}	_❓	_✅	_✅	_✅	2874 _{(new) 🟩}	3186 _{(new) 🟩}	3268 _{(new) 🟩}
_Thrawn	_3.2	_2026-09-04	_{Feiyu Lin}	_❓	_✅	_✅	_✅	3011 _{(new) 🟩}	3421 _{(new) 🟩}	3484 _{(new) 🟩}
_Cheng4	_4.49	_2026-09-03	_{Martin Sedlak}	_❓	_✅	_✅	_✅	2994 _{(new) 🟩}	3310 _{(new) 🟩}	3398 _{(new) 🟩}
_Zigqueen	_6.1.1	_2026-09-03	_{Matthias Stier}	_❓	_✅	_✅	_✅	3089 _{(new) 🟨}	3471 _{(new) 🟨}	3514 _{(new) 🟨}
_AteNika	_0.5.0	_2026-09-02	_{Yevhenii Sekhin}	_❓	_✅	_✅	_❓

🟥 This time control has been tested with less than 50 games, expect considerable changes still.
🟨 This time control has been tested with less than 150 games, expect smaller changes still.
🟩 This time control has been tested with 150 or more games, only minor changes expected.

The numbers displayed here are from the E-Core environment, that is most accurate. They differ from previous months that used older hardware for the calculations. The different environments can be seen on the detail page. Also see version detail page for concrete numbers of games and more.

Complete Lists:
Ratings: Complete list, grouped per release
Ratings: Complete list, each Timecontrol

Test Conditions:
GUI/CLI: Cute-Chess
Elo Calculation: Bayesian-Elo
CPU: Intel(R) Core(TM) Ultra 7 265T (1.50 GHz) - E-Core
Opening book: 8_moves_v3
ponder is off
hash size is engine default
STC: 8.0+0.08s, LTC: 60.0+0.60s, VLTC: 2m24s+1.12s

A detailed explanation can be found in methodology.

These engines are not included in the main table above.

Engine	Version	Published	Author	AI usage	Bin	VT	Init	cElo _{(∆ prev) STC _8.0+0.08s}	cElo _{(∆ prev) LTC _60.0+0.60s}	cElo _{(∆ prev) VLTC _2m24s+1.12s}
_{Newer version this month:}
_Triumviratus	_8.0	_2026-09-30	_{Francesco Torsello}	_❓	_✅	_✅	_✅	3575 _{(new) 🟨}	3688 _{(new) 🟨}	3771 _{(new) 🟨}
_RustyRival	_1.0.72	_2026-09-30	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.71	_2026-09-28	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.70	_2026-09-27	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Arche	_0.4.7	_2026-09-27	_{Andrew Wright}	_❓	_✅	_✅	_❓
_Arche	_0.4.6	_2026-09-23	_{Andrew Wright}	_❓	_✅	_✅	_❓
_Peras	_3.6.0	_2026-09-20	_{Jesse Sissala}	_❓	_✅	_✅	_❓
_Peras	_3.5.0	_2026-09-20	_{Jesse Sissala}	_❓	_✅	_✅	_❓
_Gaia	_4.3.2	_2026-09-19	_{Jean-Francois Romang, David Rabel}	_❓	_✅	_✅	_❓
_Arche	_0.4.5	_2026-09-19	_{Andrew Wright}	_❓	_✅	_✅	_❓
_Peras	_3.4.0	_2026-09-19	_{Jesse Sissala}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.69	_2026-09-19	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.68	_2026-09-17	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Peras	_3.3.0	_2026-09-15	_{Jesse Sissala}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.67	_2026-09-15	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Peras	_3.2.0	_2026-09-15	_{Jesse Sissala}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.66	_2026-09-15	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Arche	_0.4.4	_2026-09-14	_{Andrew Wright}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.65	_2026-09-13	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Arche	_0.4.3	_2026-09-12	_{Andrew Wright}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.64	_2026-09-11	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.63	_2026-09-10	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.62	_2026-09-09	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Zigqueen	_6.2.0	_2026-09-09	_{Matthias Stier}	_❓	_✅	_✅	_❓
_Gaia	_4.3.1	_2026-09-08	_{Jean-Francois Romang, David Rabel}	_❓	_✅	_✅	_❓
_Arche	_0.4.2	_2026-09-07	_{Andrew Wright}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.61	_2026-09-07	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Russell	_1.1	_2026-09-07	_{Dominic Fuentes}	_❓	_✅	_✅	_❌
_RustyRival	_1.0.60	_2026-09-06	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.59	_2026-09-05	_{Chris Moreton}	_❓	_✅	_✅	_❓
_Arche	_0.4.1	_2026-09-04	_{Andrew Wright}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.58	_2026-09-04	_{Chris Moreton}	_❓	_✅	_✅	_❓
_RustyRival	_1.0.57	_2026-09-01	_{Chris Moreton}	_❓	_✅	_✅	_❓
_{could not be initialized:}
_Luminex	_6.1.0	_2026-09-24	_{Cheng Chang}	_❓	_✅	_✅	_✅	1833 _{(new) 🟩}	2196 _{(new) 🟩}	2391 _{(new) 🟩}
_Luminex	_6.0.0	_2026-09-23	_{Cheng Chang}	_❓	_✅	_✅	_❌
_StockDory	_0.2.1	_2026-09-20	_{Shaheryar Sohail}	_❓	_✅	_✅	_❌
_Owen	_2.1.0	_2026-09-19	_{Hemesh Kasukurthy}	_❓	_✅	_✅	_✅	344 _{(-1805) 🟨}	402 _{(-2394) 🟩}	456 _{(-2440) 🟩}
_StockDory	_0.2	_2026-09-15	_{Shaheryar Sohail}	_❓	_✅	_✅	_❌
_Triumviratus	_7.0	_2026-09-10	_{Francesco Torsello}	_❓	_✅	_✅	_❌
_Russell	_1.2	_2026-09-09	_{Dominic Fuentes}	_❓	_✅	_✅	_❌
_Russell	_1.1	_2026-09-07	_{Dominic Fuentes}	_❓	_✅	_✅	_❌
_{missing Virustotal clearance:}
_Casanchess	_2.0	_2026-09-24	_{Carlos Sanchez Mayordomo}	_❓	_✅	_❌	_❓
_Sykora	_4.1	_2026-09-23	_{Sullivan Bognar}	_❓	_✅	_❌	_❓
_{LunaChessEngine}	_3.1.4	_2026-09-15	_{Daniele Marpino}	_❓	_✅	_❌	_❓
_Mors	_0.2.0	_2026-09-15		_❓	_✅	_❌	_❓
_{missing Binaries:}
_{LunaChessEngine}	_4.0.0	_2026-09-30	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_{Ahoy_Matey_1.10}	_1.10	_2026-09-30	_{Tom Coffin}	_❓	_❌	_❓	_❓
_Simplechess	_3.4.0	_2026-09-27	_{Sam Moore}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.7	_2026-09-27	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_Simplechess	_3.3.2	_2026-09-24	_{Sam Moore}	_❓	_❌	_❓	_❓
_Capizero	_beta2.8.1	_2026-09-23	_{Hugo Souza}	_❓	_❌	_❓	_❓
_Simplechess	_3.3.1	_2026-09-23	_{Sam Moore}	_❓	_❌	_❓	_❓
_Simplechess	_3.3.0	_2026-09-22	_{Sam Moore}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.6	_2026-09-20	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.5	_2026-09-19	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_PyChess	_1.2.0	_2026-09-19	_{Bajusz Tamas, Ahle Dybdahl Thomas, Blanchard Justin}	_❓	_❌	_❓	_❓
_Simplechess	_3.2.0	_2026-09-16	_{Sam Moore}	_❓	_❌	_❓	_❓
_Ember	_2.2	_2026-09-16	_{Daniel Krețu}	_❓	_❌	_❓	_❓
_Ember	_1.1	_2026-09-16	_{Daniel Krețu}	_❓	_❌	_❓	_❓
_Stellar	_1.6	_2026-09-12	_{Dimitrije Dobrota}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.3	_2026-09-11	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_Owen	_2.0.0	_2026-09-08	_{Hemesh Kasukurthy}	_❓	_❌	_❓	_❓
_Simplechess	_3.1.0	_2026-09-07	_{Sam Moore}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.2	_2026-09-07	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_{LunaChessEngine}	_3.1.1	_2026-09-05	_{Daniele Marpino}	_❓	_❌	_❓	_❓
_Chester	_0.4.3	_2026-09-04	_{Mariano Wahlmann}	_❓	_❌	_❓	_❓
_Latrunculi	_1.0.0	_2026-09-04		_❓	_❌	_❓	_❓

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