Doubly or triply-pushed Pawns can be e.p. captured on both squares they skip. J counts as Pawn, and J and P can e.p.-capture each other. K and Q can both castle, moving 3 squares towards the Rook. P and J promote on the last 3 ranks, to N, B, R or Q. (???)
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Alpha-Omega: local game

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Play against remote opponent (turn-based)

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