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    I got checkmated by a glorious pawn-to-queen promotion where the original queen controlled the seventh and the promoted controlled the last rank.

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      PicoLisp chess engine, ~1K LOC, can win computer on Level4 on lichess.org and always loose on Level5.

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        The hardest part is actually telling the pieces apart. I’m not really strong (ELO 1000 on lichess) and I beat it on my first try.