No. 1146 (PR)

Paul Rãican


Original Problems
JF Retro and PG problems 2015-2016

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Definition: (click to show/hide)

No.1145 Paul Rãican

original – 24.10.2016

Solution: (click to show/hide)

white Bf1c1 Ke1 Qd1 Ph2g2f2e2d2c2b2a2 Sg1b1 Rh1a1 black Bf8c8 Ke8 Qd8 Ph7g7f7e7d7c7b7a7 Sg8b8 Rh8a8

PG 16.5                                     (8+11)

10 Responses to No. 1146 (PR)

  1. Luce Sebastien says:

    Julia, the n° of this diag is 1146 !

  2. Nikola Predrag says:

    Dmitri’s Py2Web is priceless for such problems.
    It makes me aware that I don’t actually see why not 11.Rxg1/17.Kd3.

  3. Nikola Predrag says:

    Thanks Joost!
    Nice line-closing and of course unexpected for those (it’s me) who unduly but stubbornly look for the answer only on e,f,g files.
    Quite a misconception 🙁

  4. Quite an achievement, do I see it right as Schnoebelen AUW by both sides? Great choice of fairy condition right for the idea…

    • Joost de HeerJoost de Heer says:

      No white queen promotion.

      Personally, I think the chance of this being correct is less than 1%, but it takes too much time to find the cook.

      • François Labelle says:

        Cooked in 15.5 moves:

        1. d4 e5 2. Bg5 Qxg5 3. dxe5 Qxe5 4. a4 Qc3 [c7,g7=w][b2,c2=b]+ 5. Sxc3 Ke7 6. Ra3 cxd1=Q [d7=w][e2,a4=b]+ 7. Sxd1 Sc6 8. Kd2 exf1=R 9. Rh3 Sd8 10. gxh8=B Rxf2 [f7=w][g2=b]+ 11. Kd3 Bh6 12. Bf6 [b2=w]+ Rxf6 13. dxc8=B Rf1 14. f8=R Rf3 [h3,f8=b]+ 15. Sxf3 g1=B 16. Rxg1

        This solution was found by an experimental fairy PG solver I’m working on. The program uses heuristics to search the most likely moves first, and this problem seemed like a good test given Joost’s comment. In 25 min it found cooks in both 16.5 and 16.0 moves. Letting it run for 13h, it found the cook shown above in 15.5 moves.

        My program looks really promising so I’ll keep working on it and I plan to make it available. Timescale: a few months.

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