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  1. Joined
    15 Dec '20
    Moves
    53
    16 Mar '24 13:25
    @bigdogg said
    Crash the internet?! How can I resist that kind of chance at infamy.
    If a person crashes the internet and no one finds out (because there's no internet to spread the news), does the act still qualify for "infamy"? 🙂
  2. Joined
    15 Dec '20
    Moves
    53
    09 Mar '24 17:04
    I came up with the same answer as did Geoff ( Ba6# ), and my construction is similar to his.

  3. Joined
    15 Dec '20
    Moves
    53
    09 Mar '24 15:00
    @bigdogg said
    Correct!

    You should try the one in Thread 199131. That one is the toughest of them all. No one has gotten it yet.
    I've been avoiding it. 🙂 But maybe I'll tackle it.
  4. Joined
    15 Dec '20
    Moves
    53
    09 Mar '24 04:10
    @bigdogg said
    Here's another one.

    Find the invalid move in:
    Nb1+, Bc1+, Qd1+, Ke1+, Bf1+, Ng1+
    Here's my guess.

    Reveal Hidden Content
    Ng1+ is the invalid move, one construction being (in Forsyth notation)
    8/8/8/8/R1Bk1B1R/2N5/5K2/B5Q1.
  5. Joined
    15 Dec '20
    Moves
    53
    08 Mar '24 01:03
    @bigdogg said
    Black to move

    It's a mystery position. One of the following moves is not possible - which one?

    Bh1, g1=Q, Rhc1, Ng1
    Here's my guess.

    Reveal Hidden Content
    Bh1 and g1=Q are mutually exclusive because before either move, the g-pawn would have been at g2 and the bishop would have been on the h1/a8 diagonal. But the pawn would block the bishop from reaching h1.

    Bh1 and Rhc1 are mutually exclusive because before either move, the rook would have been at h1, thereby preventing the bishop from moving there.

    To resolve both of these conflicts by eliminating only one move, Bh1 must be eliminated.

    Therefore, of the four moves given, Bh1 is the one that is not possible.
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