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    looks like I fixed tests in Ruby, so now some solutions become invalid. Hope nobody cares a lot.

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    got the same problem on input ["a4", "dxc6", "gxh4", "axb2", "bxc4", "a2", "axb4", "b2", "c3"]
    Expected: "gxh4 is invalid", instead got: "dxc6 is invalid"

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    The reference implementation apparently does not check if there is a piece to be captured.

    On 'cxd3' as the first move it happily moves the white c pawn to d3.

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    Same stuff happened to me, also forced my way through random tests, but I don't care enough to verify why this happens.

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    Moves: ["exd3", "c5", "e5", "a2", "f3", "g5", "c2", "e4", "c4"]
    Expected: "e5 is invalid", instead got: "exd3 is invalid"

    I printed the moves array and it shows clearly that a capturing move on the first turn should be invalid. I can also pass the kata after submitting a few times, presumbly the bugged test is not generated.

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    Could you give original board inputs? 7 other people have passed this though, are you sure you haven't mutated the input in some way?

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    The random test in Ruby is bugged. When an invalid capturing move is given, the move after it is expected??

    ["cxb3", "b6", "b6"]
    Expected: "b6 is invalid", instead got: "cxb3 is invalid"

    ["cxd3", "b7", "a2", "b7", "a4", "gxh6", "a4", "d4", "d4"]
    Expected: "b7 is invalid", instead got: "cxd3 is invalid"

    ["dxc3"]
    Expected: [[".", ".", ".", ".", ".", ".", ".", "."], ["p", "p", "p", "p", "p", "p", "p", "p"], [".", ".", ".", ".", ".", ".", ".", "."], [".", ".", ".", ".", ".", ".", ".", "."], [".", ".", ".", ".", ".", ".", ".", "."], [".", ".", "P", ".", ".", ".", ".", "."], ["P", "P", "P", ".", "P", "P", "P", "P"], [".", ".", ".", ".", ".", ".", ".", "."]], instead got: "dxc3 is invalid"

    ["e3", "a6", "fxe3", "c3", "b3", "a4"]
    Expected: "c3 is invalid", instead got: "fxe3 is invalid"