An official account for updates on the open source AI learning how to play chess
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Joined March 2018
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Round 2 of the Leela odds blitz challenge: Who will claim the $300 prize for winning a double knight odds match against Leela? Details in our blog at lczero.org/blog/2026/03/leel…
We're ecstatic to see our open data powering so many strong engines. In the latest CCRL Blitz list alone, at least 20 of the top 80 are 'guilty' of using it, according to this site [leeler.net/]. We sincerely hope this number grows!
New blog post: EngineBattle, a comprehensive tool for streaming, testing, and analyzing Lc0 and other chess engines: lczero.org/blog/2025/07/engi…
@GMHikaru vs LeelaKnightOdds... How did it go?😉
— "Like every game it's the same thing. It's like I think I'm okay and then I'm not okay at all."
Watch the video here: youtube.com/watch?v=pYO9w3tQ…
Follow the FIDE Women’s World Chess Championship 2025 with our live analysis: live.lczero.org.
You saw similar analysis at the WWC 2024! The analysis directly shows win/draw/loss probabilities instead of just centipawns.
Our Lichess odds bots just got a specialized contempt search update making them even tougher to beat. Challenge them now: lichess.org/@/LeelaKnightOdd… lichess.org/@/LeelaQueenOdds lichess.org/@/LeelaPieceOdds lichess.org/@/LeelaRookOdds
LeelaKnightOdds vs. GM Joel Benjamin, former multiple US champion, in a classical time control (60'+30") knight odds match. January 25-27. Lichess: lichess.org/broadcast/leela-…. Commentary by GM Sadler: youtube.com/@SiliconRoadChes…. More details in our blog post: lczero.org/blog/2025/01/leel…
We're excited to announce a knight odds match: GM Awonder Liang vs. LeelaKnightOdds! Join us on December 12th, 3-6 pm EST (8-11 pm UTC) on @Lichess. Time control: 10'+5". First to 6 wins. Live stream by @gmmds on youtube.com/@SiliconRoadChes…. More info: lczero.org/blog/2024/12/leel….
We won't adjust win/draw/loss probabilities by player ratings and the clock at live.lczero.org for tomorrow's game, as some people suggested. This also keeps Lc0 from losing the last move's thinking with a new move. Let us know which you prefer!
As we mentioned, we'll have live annotations of the World Chess Championship 2024 games at live.lczero.org/. Check out our blog post for more details: lczero.org/blog/2024/11/wcc2….
Join us today, Nov 17 from 4-6pm UTC for an Queen Odds match between Leela & chess streamer CM David Maycock on Lichess (LeelaQueenOdds vs Respectful_Dave)! 20 games + possible bonus round. More info: lczero.org/blog/2024/11/leel…
The Leela Chess Zero team decided to withdraw from participating in the WCCC, as we believe the competition did an unsatisfactory job in evaluating compliance with participant rules. More details here: lczero.org/blog/2024/10/why-…
The match is starting, and @gmmds is going to comment it on his youtube channel.
Join me tomorrow from about 13:00 UTC / 13:00 UK time / 14:00 CET on youtube.com/@SiliconRoadChes… for the Leela - GM David Navara knight odds match hosted by @lichess The match starts at 14:00 UTC and I’ll spend some time before looking at some examples of Leela’s knight odds play!
Everything you wanted to know about the Leela vs GM David Navara knight odds exhibition match, but were afraid to ask, in our blog post: lczero.org/blog/2024/03/leel…
Announcing a knight odds exhibition match between @LeelaChessZero and GM David Navara. Live on @Lichess, Saturday March 30, 2-5pm UTC timeanddate.com/worldclock/f…, 10 games at various time controls, starting with 5'+3".
In the recent paper arxiv.org/abs/2402.04494 @GoogleDeepMind introduced a transformer chess network, but didn't include Lc0 in their comparison. We've used transformers for a while, and our network is stronger with fewer parameters. More details soon.
..and the blog post with more details is live at lczero.org/blog/2024/02/how-…
Maybe chess is not a draw after all. Leela just won a game vs stockfish in the 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 opening where stockfish had eval of just 0.26
tcec-chess.com/#div=kibitzer…
We used to write blog posts so infrequently, you could set your calendar by them, but now we're cranking them out so fast, you'll need a stopwatch. Check out our latest update: lczero.org/blog/2023/01/2022…
Hey everyone! It's been a while, but we're back with a new release of Lc0 - v0.29, and a blog post too. Sorry for the hiatus, we were busy teaching our neural networks how to play hide and seek. Check out the blog post for all the details: lczero.org/blog/2022/12/lc0-…
Last day of the #WCCC today. We play vs the Baron, then possibly up to four tie breaks and Armageddon. Later speed chess with a tight 5 second increment. Stream is already up at lc0.org/twitch, the first game starts in 8 minutes!