[Retros] Ortho-reconstructions

[Pascal Wassong]

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+


This is very strange, as it is easy to render it unique.  Here is a
version:

+---+---+---+---+---+---+---+---+

|*R | Q |*B | B |   | . |   |*R |

+---+---+---+---+---+---+---+---+

|*Q |   | . |*P | . |*P | . |*P |

+---+---+---+---+---+---+---+---+

|   |*P |*S |*K |*P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   |*P |   | . |   |*P |   |

+---+---+---+---+---+---+---+---+

| P | . |   | . | P | . |   | . |

+---+---+---+---+---+---+---+---+

| . |   | . |   | . |   | . |   |

+---+---+---+---+---+---+---+---+

| R | P |   | K | P | P | P | P |

+---+---+---+---+---+---+---+---+

| . | S | . |   | . | B | S | R |

+---+---+---+---+---+---+---+---+
rQbB3r/q2p1p1p/1pskp3/2p3p1/P3P3/8/RP1KPPPP/1S3BSR
25 single moves.	15 + 13

The resolution begins at Sun Mar 28 20:20:01 2010

Solution 1 (position 7)
 1.Pc2-c4   Pe7-e6    2.Pc4-c5   Bf8xc5    3.Qd1-a4   Bc5-e3   
 4.Qa4xa7   Pc7-c5    5.Pa2-a4   Qd8-a5    6.Ra1-a2   Pb7-b6   
 7.Qa7-b7   Qa5-a7    8.Pd2xe3   Ke8-e7    9.Pe3-e4   Ke7-d6   
10.Bc1-g5   Sg8-e7   11.Ke1-d2   Se7-c6   12.Bg5-d8   Pg7-g5   
13.Qb7xb8   

The resolution ends at Sun Mar 28 20:20:03 2010
Resolution time : 2.06 s.

To be complete, the stipulation of the problem is:
Drawn.  Proof game in 18.5 moves.


Best,
Pascal



>>>>> "Николай" == Николай Белухов <nbeluhov at abv.bg> writes:


    Николай> Corrected version of the Ortho-reconstructions paper
    Николай> available on the chessproblem.net forum as well as here
    Николай> (several typos and a cook pointed out by Mario Richter):
    Николай> https://docs.google.com/fileview?id=
    Николай> 0B84M-EsbAvopODliNDg0OWMtNWIxYy00MjA2LTk4YzItNmQ4YmU5MTI3ODAw&hl=en
    Николай> Best, Nikolai