sunfish

It appears that the “111 lines” is a reference to the version as of 2014-02-11: https://github.com/thomasahle/sunfish/blob/e2b7fc29ce2a112be... (386 lines), about which the author says (https://www.reddit.com/r/programming/comments/1xmj1a/comment...): > I got 111 by deleting the tables in the top, and the UI code in the bottom, and then running 'cloc' on the result. That gave 20 blanks, 56 comments and 111 lines of code. ;-)

For people interested in making their own, I highly recommend reading through https://github.com/thomasahle/sunfish/blob/master/sunfish.py , a surprisingly readable and surprisingly strong chess engine in 111 lines of Python https://www.chessprogramming.org/ is also really interesting, see e.g. https://www.chessprogramming.org/Sunfish and https://www.chessprogramming.org/Quiescence_Search

I think that's the most plausible theory that would explain the sudden hike from gpt-3.5-turbo to gpt-3.5-turbo-instruct, and again the sudden regression in gpt-4*. OpenAI also seem to augment the LLM with some type of VM or a Python interpreter. Maybe they run a simple chess engine such as Sunfish [1] which is around 1900-2000 ELO [2]? [1] https://github.com/thomasahle/sunfish [2] https://lichess.org/@/sunfish-engine

Incomprehensible scheiße code. I looked around and I like this one because it has "meta-level" definition of movements and liitle bit of strategy. You could implement context-free chess games with varying rules for us congenitally lazy and dull-witted. https://github.com/thomasahle/sunfish/blob/master/sunfish.py

For people who'd like the joy of seeing their hobby engine face real people, Lichess has a nice system for verified bot accounts: https://lichess.org/team/lichess-bots I'm personally running bits for sunfish https://github.com/thomasahle/sunfish and fastchess https://github.com/thomasahle/fastchess There are way too many stockfish clones on there. I hope more hobby chess engine builders will join in.

Interesting, I didn't know about the second chance queue. This appears to be the best source of information: https://news.ycombinator.com/item?id=11662380 Personally I was sad when my tiny python chess engine Sunfish [1] didn't make it past the two-three upvotes stage. However about half a year later somebody else submitted it and it got a lot of traction. I wonder how accepted it is to resubmit the same, or a version of, your project or blog post, to try your luck again. [1] https://github.com/thomasahle/sunfish

I think sunfish (https://github.com/thomasahle/sunfish/blob/master/sunfish.py) would be a much better example of a simple chess AI (~100 lines of python code), even if it's not very well documented. The article doesn't talk about very important concepts like quiescence search (https://chessprogramming.wikispaces.com/Quiescence+Search ) Sunfish doesn't use any of the "further improvements" proposed in the article and still performs much better