Chess.com Computer Ratings: Nov. 2020
How strong are the best computer chess engines?

Chess.com Computer Ratings: Nov. 2020‎

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Chess.com is pleased to announce the Chess.com Computer Chess Ratings. These ratings are calculated based on performances in the Chess.com Computer Chess Championship, Chess.com's 24/7 computer tournament platform where the best engines are constantly battling. To ensure accurate ratings, we conducted a benchmarking tournament under the Computer Chess Rating List (CCRL) conditions which included engines from the CCRL blitz rating list running on 4 CPUs and the current Ethereal engine, running on our hardware with 90 CPUs. Ethereal scored a performance rating of 3578. All ratings are then derived from performances in this event.

Ratings will be released on the 1st of each month and will be based on games played in the last 60 days. Given rapid developments in computer chess, multiple development versions of engines may have competed in the rating period. Consequently, we caution readers not to interpret these ratings as being the most accurate estimate of each engine's strength. Usually, such estimates are achieved through careful benchmarking by the development team. The Chess.com Computer Ratings are most useful for providing insight into the relative performance of all competing engines in the Chess.com Computer Chess Championship.

Our inaugural rankings include both Stockfish and Stockfish Classic, acknowledging the significant development of NNUE technology which incorporates a neural network evaluation into traditional brute-force engines. The most recent releases of Stockfish with NNUE top both our blitz and bullet lists, while the latest version of Stockfish without NNUE still ranks highly and is retained separately on our list for comparison purposes.

Bullet Ratings (since August 31)

# Logos Engine Elo Points Games (%)
1 Stockfish 3704.7 147.5 179 82
2 Leelenstein 3669.8 271 339 80
3 Lc0 3664.5 108.5 138 79
4 Stockfish Classic 3663.1 156 200 78
5 Komodo 3596.1 119.5 168 71
6 Ethereal 3578 1173 1669 70
7 Stoofvlees 3560.1 95 140 68
8 Fire 3510 100 166 60
9 Houdini 3508.3 204.5 438 47
10 DarkQueen 3458.5 77.5 138 56
11 Komodo MC 3457.4 76 138 55
12 Xiphos 3454.9 173.5 438 40
13 Rofchade 3441.3 314 799 39
14 Rubi 3419.6 599 1143 52
15 Laser 3419.1 71 140 51
16 SlowChess 3410.4 260.5 669 39
17 Lc0 CPU 3402.8 5 33 15
18 Shredder 3364.3 60.5 140 43
19 Senpai 3346.6 136.5 342 40
20 Defenchess 3320.8 121.5 334 36
21 Texel 3301 49 140 35
22 Winter 3297 94.5 299 32
23 Wasp 3288.3 48 140 34
24 Vajolet 3284.1 46.5 140 33
25 Andsacs 3278.3 154 640 24
26 Nemorino 3227.9 37.5 138 27
27 BlackMambo 3015.6 14 139 10

Blitz Ratings (since August 31)

Rank Logo Engine Elo Points Games (%)
1 Stockfish 3791.4 573 810 71
2 Stockfish Classic 3758.9 482 754 64
3 Komodo 3691.4 452 688 66
4 Fire 3617.3 163.5 288 57
5 Lc0 CPU 3582.2 392 1100 36
6 Komodo MC 3581.8 149.5 288 52
7 Xiphos 3581.1 81.5 156 52
8 Ethereal 3578 148 288 51
9 Rofchade 3544 134.5 288 47
10 SlowChess 3533.9 130.5 288 45
11 Defenchess 3475.2 59 156 38
12 Rubi 3440.8 95 288 33
13 Wasp 3372.4 79.5 332 24
14 Winter 3367.2 70 288 24

Want to see some of the incredible games played in the Chess.com Computer Chess Championship? Don't miss our "Computer Chess" playlist on YouTube!

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