[Retros] Ortho-reconstructions

[Pascal Wassong]

Thank you Joost, for this clarification.  I couldn't believe that the
author missed such a 'cook'.



>>>>> "Joost" == Joost de Heer <joost at sanguis.xs4all.nl> writes:


    Joost> On 03/28/2010 08:29 PM, Pascal Wassong wrote:
    >> Hello,
    >> 
    >> I studied this paper, and the previous ones, with great
    >> interest.
    >> 
    >> The proof game of problem 18, by Guus Rol, is not unique.  For
    >> example:
    >> 
    >> 1.c4 e6 2.c5 Bxc5 3.Qb3 Be3 4.Qa4 c5 5.Qxa7 Qa5 6.f3 b6 7.Qb7
    >> Qa7 8.dxe3 Ke7 9.e4 Kd6 10.Bg5 Nc6 11.Bd8 g6 12.Qb8+

    Joost> The 'cook' is intentional. The diagram position would be
    Joost> illegal with this proofgame, since the 3-fold repetition
    Joost> happens already after the 17th move by black.

    Joost> The only solution is: 1. c4 g6 2. c5 Bh6 3. c6 Be3 4. cxb7
    Joost> c5 5. Qb3 Qa5 6. Qb6 axb6 7. f3 Qa7 8. dxe3 e6 9. e4 Ke7
    Joost> 10. Bg5+ Kd6 11. Bd8 Nc6 12. b8=Q+

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