No.1232 (ND)

No.1232
Nicolas Dupont (France)

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Original Retro & PG problems
JF – R2017-18


Definition: (click to show/hide)


No.1232 Nicolas Dupont
France

original – 24.06.2017

Solution: (click to show/hide)

neutral Ia8c8d8e8f8h8a7b7c7d7e7f7g7h7a1b1c1d1e1f1g1h1a2b2c2f2g2h2

PG 6.5                       (0+0+28)  (C-)
Checkmate position
Undefined pieces
Disparate


8 Responses to No.1232 (ND)

  1. TheoGiakatis says:

    Does the solver have to find the final image only? Or does he have to find the series of movements that lead to it? Is this series of moves unique?

  2. Nikola Predrag says:

    Stipulation asks for any legal play of 6.5 moves ending with mate, where any 28 white or black pieces occupy the 28 squares marked on the diagram.

    The final image must be legally achievable, so a solver must provide any proper PG in 6.5 moves.
    If there’s more than one PG, the problem is cooked (unless multi-solution was intended and indicated by the author).

  3. TheoGiakatis says:

    A solution can be: 1.d4 Nc6 2.e4 Nd4 3.Qd4 Nf6 4.e5 Ne4 5.e6 Nc3 6.Qg7 Nd1 7.ef7#.
    However, it is easy to see that the same position can arise after a different order of these movements.

  4. Nikola Predrag says:

    I’m far from being an expert in that field but this looks as a cook-solution to me. Well found!

  5. Nicolas Dupontdupont says:

    Yes this is a valid cook! François Labelle found almost the same one.

    • Ladislav Packa says:

      Why cook? The final position in the “cooked” solution is not mat. Any black pawn move is a sufficient defense.
      By the way, PG in the author’s solution is correct (I do not mean a diagram with undefined pieces, only PG).

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