The latest CCRL update (21st June 2025)

[Graham Banks]

The latest CCRL Rating Lists and Statistics (21st June) are available for viewing from the following links:

www.computerchess.org.uk/ccrl/4040 (40/15 and 15m+10s)
www.computerchess.org.uk/ccrl/404 (BLITZ 2m+1s)
www.computerchess.org.uk/ccrl/402.archive/ (BLITZ 40/2 Archive)
www.computerchess.org.uk/ccrl/404FRC (FRC 40/2)
www.computerchess.org.uk/ccrl/Chess324/ (Chess324)

Our 40 moves in 15 minutes repeating (including 15 minutes with 10 second increments) and 2 minutes with 1 second increments are both adjusted to the Intel i7 4770k (3.5GHz) using the Stockfish 10 64-bit benchmark.
All of our current testing uses AVX2 compiles where available.

Be aware that in the early stages of testing, an engine's rating can often fluctuate a lot.

It is strongly advised to look at the many other rating lists available in order to get a more accurate overall picture of an engine's rating relative to others.

The inclusion or exclusion of engines in our lists should not be taken as our group making a statement about their legality or status. Where there is controversy, it is usually mentioned in the engine notes.

Thanks to:
- Kirill Kryukov who wrote the scripts that produce all CCRL data, with recent processing speed-ups from Martin Sedlak (Cheng author).
- all of our currently active testers (Graham, Gabor, Basti, Shaun and Andres). We welcome Mattia Giambirtone as a new CCRL tester.
- Ray who ran the time-consuming weekly updates for a very long time, a task now shared among three testers.
- Jay Honnold for both the tournament viewer and for hosting Graham's live broadcasts.
- all engine authors. Without you, CCRL wouldn't exist.
- Anton Mihailov (Chessdom.com) for hosting our rating lists for many years.
- Sam Roelants (Simbelmyne author) who has taken over the hosting of our rating lists.

40/15 and 15m+10s testing this week will include (thanks to Graham, Andres and Shaun. Live broadcast given where applicable):

Live broadcasts of some Gauntlets can be made available upon request.
(Web based viewer courtesy of Jay Honnold, with additions by Lana (Princhess), Jost Triller (Nalwald) and Finn Eggers (Koivisto).

119th Amateur Series Division 1 (starting today) Broadcast link to be advised
119th Amateur Series Division 2 (starting Tuesday) Broadcast link to be advised
119th Amateur Series Division 3 (starting Wednesday) Broadcast link to be advised
The Snail And The Stallion Tournament (finishing Tuesday) Web based viewer http://ccrl.live/16070
Isa, EveAnn And The Panda Tournament (finishing Wednesday) Web based viewer http://ccrl.live/16065
Attack Of The Lynx Tournament (finishing Wednesday) Web based viewer http://ccrl.live/16071
New tournament (starting Wednesday) Broadcast link to be advised

Winter 4.0 64-bit 4CPU Gauntlet (continuing) Web based viewer http://ccrl.live/16061
PlentyChess 6.0.0 64-bit 4CPU Gauntlet (finishing Wednesday) Web based viewer http://ccrl.live/16062
Renegade 1.2.0 64-bit 4CPU Gauntlet (finishing Thursday) Web based viewer http://ccrl.live/16063
pawnocchio 1.7.2 64-bit 4CPU Gauntlet (starting Wednesday) Web based viewer http://ccrl.live/16062
Stormphrax 7.0.0 64-bit 4CPU Gauntlet (starting Thursday) Web based viewer http://ccrl.live/16063

PlentyChess 6.0.0 64-bit Gauntlet (continuing)
Motor 0.9.0 64-bit Gauntlet (continuing)
Zangdar 4.04 64-bit Gauntlet (continuing)
Astra 5.2 64-bit Gauntlet (continuing)
Calvin 6.1.1 64-bit Gauntlet (finishing Wednesday)
Stormphrax 7.0.0 64-bit Gauntlet (starting Wednesday)

Various 1CPU and 4CPU Gauntlets being run by Andres, who is submitting 4-5 gauntlets each week.

2m+1s testing since the last update report has included (thanks to Gabor and Shaun):

StAndersen 1.31 64-bit
Horsie 1.1.0 64-bit
Lunar 0.2.0 64-bit
Juggernaut 1.00 64-bit
Cinder 0.2.0 64-bit
Motor 0.9.0 64-bit
Lozza 5.1 64-bit
RukChess 4.1.0 64-bit
PlentyChess 6.0.0 64-bit
PZChessBot 2.0 64-bit
Freda 1.1 64.bit
Maelstrom 2.0.0 64-bit
EveAnn 3.4 64-bit

FRC 40/2 testing since the last update report has included (thanks to Basti and Matt):

On hold until Matt starts testing.

Chess324 (thanks to Basti and Matt)

On hold until Matt starts testing.

[Steve Maughan]

Thanks for testing Juggernaut. It got a higher rating than I expected — even higher than Monarch. Is that any reason Juggernaut was not tested on 4 cores (it probably is the weakest multi-threaded engine).

— Steve

[Graham Banks]

Thanks for testing Juggernaut. It got a higher rating than I expected — even higher than Monarch. Is that any reason Juggernaut was not tested on 4 cores (it probably is the weakest multi-threaded engine).

— Steve

It would be impossible to test all of the engines with more than 1 core.
I do most of the 4CPU testing for the 40/15 list (Shaun and Andres help occasionally), while Shaun does the 8CPU testing for the blitz list.
The focus is from the top down.