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Thread: KRR vs K

  1. #1
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    KRR vs K

    wKa1,Ra2,Rb1 or 8/8/8/8/8/8/R7/KR6 w

    White wins by checkmating Black, Black wins by playing 50 moves or if White makes an illegal move. With best play, who wins? How many moves?

  2. #2
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    Quote Originally Posted by Czentovic
    wKa1,Ra2,Rb1 or 8/8/8/8/8/8/R7/KR6 w

    White wins by checkmating Black, Black wins by playing 50 moves or if White makes an illegal move. With best play, who wins? How many moves?
    A possible solution:

    1.Rbb2
    2.Ra3
    3.Kb1
    4.Kc2
    5.Rc3
    6.Rb1
    7.Rd1
    8.Rd2
    9.Kd1
    10.Ke2
    11.Re3
    12.Rd1
    13.Rf1
    14.Rf2
    15.Kf1
    16.Kg2
    17.Rg3
    18.Rf1
    19.Rh1#

    It's not pretty or efficient, but I think it works

  3. #3
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    Not quite what I had in mind, but it is completely correct and fun to watch - well done!

  4. #4
    Monster of the deep Kevin Bonham's Avatar
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    Am I missing something here? Where is the black king? Or is it invisible?

  5. #5
    CC Grandmaster road runner's Avatar
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    Quote Originally Posted by Kevin Bonham
    Am I missing something here? Where is the black king? Or is it invisible?
    I think it's taken that the black king may be on any square and the technique should still work.
    meep meep

  6. #6
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    Yes, the Black King is on any square which is not prohibited by the previous play. Also, I forgot to mention that Black wins if White stalemates. (But Mr. Pawn obviously realised that)

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