No.822 (PAP)

Petko A. Petkov


Original Problems, Julia’s Fairies – 2015 (I): January – June

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No.822 by Petko A. Petkov – A splendid Zilahi-cycle! A combination of two conditions here refutes the saying “there is safety in numbers” 🙂 (JV)


Disparate PY: If one side makes a move with a piece of type “x” (black, white, neutral, half-neutral, etc., King included), the other side cannot answer immediately by moving a piece of the same type “x”. (For example: white Qc1, black Ka8,Qa7 – mate in 1 move. After 1.Qc8#, Black is mated because 1…Qb8? is illegal. The mate is possible also with the neutral nQc1 – after 1.nQc8#. Black cannot move the same neutral Queen.) Every Pawn’s promotion is a Pawn’s move, therefore after such promotion (into any possible piece) the other side cannot answer immediately with its Pawn. We can say that after the move of the figure of type “x” any enemy figure of type “x” falls under Half-moving paralysis. This paralysis disappears immediately on the next half-move, if the opponent plays with another piece of type “y”. (“Disparate PY” is implemented as “Disparate” till the latest version of Popeye, PY 4.69. In WinChloe this version of Disparate will be available starting the next version, 3.32.)

Anti-Andernach: A piece (excluding King) changes its color after any non-capturing move. After capture, the piece retains its color. Rooks on a1, h1, a8 and h8 can be used for castling, provided the usual other rules for that move are satisfied. After castling, Rooks do not change color. If White makes a non-capturing move with neutral or halfneutral piece, that piece becomes black and vice versa.

No.822 Petko A. Petkov

original – 06.06.2015

Solutions: (click to show/hide)

white kf4 black ka4 re3 sf2 bh5 pc3d3d4d7f6g6h4

ser-h#3       3 solutions          (1+11)
Disparate PY

3 Responses to No.822 (PAP)

  1. C. Poisson says:

    Julia, you should correct your definition of “Disparate PY”, concerning the implementations.

    Another implementation of Disparate you can find in WinChloe, but it is based on the different rules“.
    In WinChloe, “Disparate PY” is implemented exactly as indicated in your definition, and will be available in the next version. But the original “Disparate” is also implemented. As you know now since our last e-mails exchange, Petko gave a wrong definition of Disparate to the Popeye team (by the way, I always expect his apologies for his wrong accusations against WinChloe and myself on this site). A problem of the original article in Phénix by Roméo Bédoni : wKh8, wPa7, bKa2, bQf7, bPb2, h#3 Disparate, is cooked in 2 moves with Petko’s definition.

    This way it is implemented in Popeye” must actually be understood as: “Disparate PY” is implemented as “Disparate” in the latest version of Popeye.

    • JuliaJulia says:

      Thank you, Christian! I’m sorry, I didn’t know if Disparate PY will be implemented in WinChloe and when it might happen. I also don’t know if the name will be changed in Popeye…
      Happy to hear about WinChloe’s next version! I hope it’s correct to mention v3.32 of WinChloe as I’ve done in the corrected definition: “In WinChloe this version of Disparate will be available starting the next version, 3.32.”

      I haven’t participated in the events happened about 10 years ago.. Chess composition was absolutely unknown for me that time. I can’t comment anything here. And also I don’t know what are the main differences in implementations of Disparate in two programs. I can only guess from the examples.
      I have to tell, that here, on JF, I can’t know everything.. Fairy world is too big and growing too fast. I always hope for experts comments to improve any unclear, doubtful, or wrong things published.
      And programmers’ comments are very welcome as well, as I believe that you’re those who know exactly what is implemented and how.

      Oh, I already have seen Disparate in the night’s dreams! 🙂
      Let’s don’t fight, dear friends, but let’s try to solve all complications together!

      • C. Poisson says:

        yes Julia, it’s correct, next version will be 3.32. Concerning the definitions, here are those I use in WinChloe:
        Disparate: A side must necessarily move a piece of a different nature than the other side.
        Disparate PY: When a side moves immediately after the other, he must necessarily move a piece of a different nature than the other side.
        So the difference is that in Disparate, the interdiction remains until the other side moves, while in Disparate PY, it remains only one half-move.

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