SCP-096 Chess

Fairy-Stockfish, patched to know the rules of the Shy Guy.

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    Rules
    • SCP-096 stands on one square. Nothing can move onto it or slide through it.
    • Once per round, after Black moves, it looks for pieces attacking its square (either colour). If there are any, it kills the nearest one and takes its square. Ties go to the higher rank, then the a-file side.
    • If that piece is a king, its side loses.
    • A king may never stand a knight's move away from the SCP (marked squares). If it has to move and can't, that's mate.
    • With several Shy Guys, they act one after another in reading order (a8 → h1). They block each other's lines of sight.
    • Otherwise normal chess. Mirrors iwantcheckmate.com's version, with two edge cases cleaned up (see README).

    Pick a piece or Shy Guy from the trays, then click or drag onto the board. Clicking a Shy Guy again removes it. Drag pieces off the board, or use 🗑, to remove them.

    Castling
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