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Makes sense, congrats on shipping!

I suppose it's unlikely to happen in a game serious/slow enough that people are bothering to record it on paper and upload it, but I've tricked someone into stalemating me by promoting to a queen before. Long term I don't think assuming people made the best move is the right decision.

Thanks! Definitely, the check and mate things should also be fixed long term. The nice thing is, I was able to put in tons of constraints to improve processing (for example the last two boxes must be a square like e4) if I ignore checks.

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