Answers.Body: <p>No, you can't play against <a href="https://en.wikipedia.org/wiki/AlphaZero" rel="noreferrer">AlphaZero</a>, unless you get a special access from <a href="https://en.wikipedia.org/wiki/DeepMind" rel="noreferrer">DeepMind</a>.</p>
  
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Answers.CreationDate: 2021-12-17T16:35:08.700Z
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Answers.UserDisplayName: Minot
Answers.Body: <p>As already explained by other answers, AlphaZero itself is not publicly available.</p>
  <p>The community has created <a href="https://lczero.org/" rel="noreferrer">Leela Chess Zero</a>, a chess engine that started by using the same basic concepts as AlphaZero, but has since seen many additional improvements. It's probably stronger than AlphaZero ever was. Their site has <a href="https://lczero.org/play/online/" rel="noreferrer">a page</a> on how to play against it, either download it or play against one of the lichess bots.</p>
  <p>As a side note, stockfish has also been improving steadily (mainly with the introduction of <a href="https://en.wikipedia.org/wiki/Efficiently_updatable_neural_network" rel="noreferrer">NNUE</a>), so it should now also be able to beat the original AlphaZero version again.</p>
  
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Answers.Text: On what grounds do you base your remark that it probably is stronger than AlphaZero? Has there been a series of 100 games of Leela against the old stockfish version that shows leela also didn't lose a single time and won > 25%? Or is there some kind of rating that can be computed?
Answers.UserDisplayName: Carlo Wood
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Answers.Text: @CarloWood The big A0 vs SF8 match was [1000 games with 155 wins and 6 losses](https://www.chess.com/news/view/updated-alphazero-crushes-stockfish-in-new-1-000-game-match), which comes to +52 elo. A bit later [SF11](https://stockfishchess.org/blog/2020/stockfish-11/) was released with +150 elo compared to SF8. Currently in the [CCC](https://www.chess.com/computer-chess-championship) LC0 is only slightly worse then SF14, which should by now be much stronger than SF11 was. I think it's pretty safe to conclude from this that both SF and LC0 are stronger than A0 was.
Answers.UserDisplayName: KarelPeeters
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Answers.Text: @CarloWood see this question: https://chess.stackexchange.com/questions/29791/which-is-better-stockfish-10-or-alphazero It's been over another year since I wrote that answer, and SF 15 dev has gained significant strength over SF 11, which was the version at the time.
Answers.UserDisplayName: Allure
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Answers.Text: @ToddSewell How did you conclude that A0 was 52 elo above SF8? Is there some formula for calculating that based on the number of wins, draws and losses?
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Answers.Text: @HelloGoodbye You can calculate this using the definition of Elo [on Wikipedia](https://en.wikipedia.org/wiki/Elo_rating_system#Theory), or more conveniently using an online calculator, I like [this one](https://3dkingdoms.com/chess/elo.htm).
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Body: <p>I have read a few articles about the game between Stockfish and AlphaZero. But is there a place where anyone can play against AlphaZero?</p>
  
Tags: <engines><websites><alphazero>
Title: Where can you play against AlphaZero?
ThreadText: # Where can you play against AlphaZero?
  
  (Asked by: username_0 on 2021-12-17)
  
  I have read a few articles about the game between Stockfish and AlphaZero. But is there a place where anyone can play against AlphaZero?
  
  **Tags:** engines, websites, alphazero
  
  
  ---
  
  ## 2 answers
  
  ### Answer by username_2 on 2021-12-18. Score: 32 | Accepted answer
  
  As already explained by other answers, AlphaZero itself is not publicly available.
  
  The community has created [Leela Chess Zero](https://lczero.org/), a chess engine that started by using the same basic concepts as AlphaZero, but has since seen many additional improvements. It's probably stronger than AlphaZero ever was. Their site has [a page](https://lczero.org/play/online/) on how to play against it, either download it or play against one of the lichess bots.
  
  As a side note, stockfish has also been improving steadily (mainly with the introduction of [NNUE](https://en.wikipedia.org/wiki/Efficiently_updatable_neural_network)), so it should now also be able to beat the original AlphaZero version again.
  
  > **Comments:**
  > **username_3**: On what grounds do you base your remark that it probably is stronger than AlphaZero? Has there been a series of 100 games of Leela against the old stockfish version that shows leela also didn't lose a single time and won > 25%? Or is there some kind of rating that can be computed?  
  > **username_2**: @username_3 The big A0 vs SF8 match was [1000 games with 155 wins and 6 losses](https://www.chess.com/news/view/updated-alphazero-crushes-stockfish-in-new-1-000-game-match), which comes to +52 elo. A bit later [SF11](https://stockfishchess.org/blog/2020/stockfish-11/) was released with +150 elo compared to SF8. Currently in the [CCC](https://www.chess.com/computer-chess-championship) LC0 is only slightly worse then SF14, which should by now be much stronger than SF11 was. I think it's pretty safe to conclude from this that both SF and LC0 are stronger than A0 was.  
  > **username_4**: @username_3 see this question: https://chess.stackexchange.com/questions/29791/which-is-better-stockfish-10-or-alphazero It's been over another year since I wrote that answer, and SF 15 dev has gained significant strength over SF 11, which was the version at the time.  
  > **username_5**: @ToddSewell How did you conclude that A0 was 52 elo above SF8? Is there some formula for calculating that based on the number of wins, draws and losses?  
  > **username_2**: @username_5 You can calculate this using the definition of Elo [on Wikipedia](https://en.wikipedia.org/wiki/Elo_rating_system#Theory), or more conveniently using an online calculator, I like [this one](https://3dkingdoms.com/chess/elo.htm).  
  
  ---
  
  ### Answer by username_1 on 2021-12-17. Score: 12
  
  No, you can't play against [AlphaZero](https://en.wikipedia.org/wiki/AlphaZero), unless you get a special access from [DeepMind](https://en.wikipedia.org/wiki/DeepMind).
  
  
  ---
  
  