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#1775126093

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[ chess ]

I was looking for interesting chess engines to test and I came across Patricia, the most aggressive chess engine ever seen. It is currently rated 3466 on Stefan Pohl’s website (compared to Stockfish 18’s rating of 3910). It is a very strong engine but probably wont ever be the best. But when it wins, it often does so in a brutal way. Bellow is a game played as part of a tournament against RofChade 3.1 with a respectable elo of 3536 (higher then Patricia but still close). The book stats with equal material with a slight position advantage for white. Patricia starts sacrificing early and doesn’t stop until a final rook sacrifice to start the push for mate. White is behind on material the entire game but still wins.

gif of chess game

Engine play starts at move 7

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#1772925659

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[ mimir | chess ]

Mimir is up to version 1.2 in the mean time and available on Lichess. It is still not super strong but a fun challenge as a human if you give yourself enough time.

https://lichess.org/@/MimirBot

The setup was relatively simple using the lichess-bot adapter. Just plugin in my UCI engine and the API key.

#1772138346

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[ mimir | odin | chess ]

Mimir V1 is done! The last commit for V1 was adding UCI, which took a bit of testing because it needs some small async things. But it is working now, and I immediate put it up against Stockfish 18. of course not the full version, I limited it using the UCI_Elo option to 1600 elo. Still feels like a fair starting point for Mimir’s first game ever. And it won convincingly with no major mistakes. This is of course not a full evaluation, but now that it works with UCI, I can start building my full test suite to get a real Elo value for this first version. This is of course still the start!

gif of chess game

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#1771316193

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[ mimir | odin | chess ]

I have been working again on my chess engine writing in Odin, Mimir. It is still far from finished but it is now able to complete a full perft test. This basically means that is able to generate all valid moves (and only valid moves) in every position given. Those move results are validated against known move counts so it is 99,99999 % correct. Next up is doing minimax algorithm and some board eval function. Then it should be able to play its first game. Will also write some more about Odin as I am getting used to it.