The latest CCRL update (4th October 2025)

[Graham Banks]

The latest CCRL Rating Lists and Statistics (4th October) 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, Andres and Matt).
- Jay Honnold for both the tournament viewer and for hosting Graham's live broadcasts.
- Jonathan Gilchrist for the utility CCRL notifier, which alerts engine authors when their engine is playing in a live broadcast.
- 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.
- all engine authors. Without you, CCRL wouldn't exist.

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).

121st Amateur Series Division 2 Tournament (finishing Wednesday) Web based viewer http://ccrl.live/16064
121st Amateur Series Division 3 Tournament (finishing Friday) Web based viewer http://ccrl.live/16071
121st Amateur Series Division 4 Tournament (continuing) Web based viewer http://ccrl.live/16073
121st Amateur Series Division 5 Tournament (starting Wednesday) Live broadcast details to be advised
121st Amateur Series Division 6 Tournament (starting Friday) Live broadcast details to be advised
The Lamb Jumped Over The Moon Tournament (finishing Tuesday) Web based viewer http://ccrl.live/16067
New Tournament (starting Tuesday) Live broadcast details to be advised

Halogen 15 64-bit 4CPU Gauntlet (starting today) Web based viewer http://ccrl.live/16061
PlentyChess 7.0.0 64-bit 4CPU Gauntlet (continuing) Web based viewer http://ccrl.live/16062
Clover 9.1 64-bit 4CPU Gauntlet (finishing Monday) Web based viewer http://ccrl.live/16063
Uralochka 3.42a 64-bit 4CPU Gauntlet (starting Monday) Web based viewer http://ccrl.live/16063

Viridithas 18.0.0 64-bit Gauntlet (finishing Tuesday)
Uralochka 3.42a 64-bit Gauntlet (continuing)
PlentyChess 7.0.0 64-bit Gauntlet (continuing)
Clover 9.1 64-bit (continuing)
Minke 2.0.0 64-bit Gauntlet (continuing)

Various 1CPU Gauntlets being run by Andres (Lynx 1.11.0 64-bit, Cwtch v3 64-bit and bitbit 1.5 64-bit)

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

Cwtch 2 64-bit
bitbit 1.5 64-bit
Zangdar 5 64-bit
Minke 2.0.0 64-bit
Lozza 8 64-bit
PlentyChess 7.0.0 64-bit
Pounce 2.1.3 64-bit
Amira 1.61 64-bit
Lambergar 1.3 64-bit
Prophet 5.1 64-bit
Lunar 0.4.0 64-bit
chess4j 6.2 64-bit
Clover 9.1 64-bit

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

Clover 9.0 (completed)
Caissa 1.23 64-bit (completed)
PlentyChess 7.0.0 64-bit (in progress)

Chess324 (thanks to Basti)

On hold for now.

DFRC 40/2 testing (thanks to Basti and Matt):

On hold for now.

[Jouni]

Plenty has passed stagnated Stockfish :

1 PlentyChess 7.0.0 64-bit 4CPU 3646
2 Stockfish 17.1 64-bit 4CPU 3645

[Graham Banks]

Plenty has passed stagnated Stockfish :

1 PlentyChess 7.0.0 64-bit 4CPU 3646
2 Stockfish 17.1 64-bit 4CPU 3645

Only 244 games so far.
Another 400 or so in the current gauntlet, so I expect its rating to come down.