AW: [Retros] SPG task (1+1)

[Gerd Wilts]

> Open question: Make an exact PG in Anti-Andernach, which ends with two

Kings.

>	Paul Raican


There is no such PG in 16,0 moves although 39 different positions with two
Kings only can be reached in 16,0 moves in Anti-Andernach. But with Einstein
Chess it seems possible to construct a Kings-only PG:

Gerd Wilts
8/4k3/8/8/8/8/4K3/8
+---+---+---+---+---+---+---+---+

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

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

| . |   | . |   |*K |   | . |   |

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

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

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

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

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

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

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

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

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

|   | . |   | . | K | . |   | . |

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

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

+---+---+---+---+---+---+---+---+
(1+1)   PG in 16,5
Einstein

1. d4 c5 2. Lg5[=wS] cxd4[=sS] 3. Sxh7[=wL] Sxe2[=sL] 4. Lxg8[=wT] Txh2[=sD]
5. Txg7[=wD] Lxg7[=sT] 6. Txh2[=wD] Txg2[=sD] 7. Dxb8 Dxg1 8. Dxa7 Dxf2+
9. Dxf2 Txa2[=sD] 10. Dxf7+ Kxf7 11. Dxd7 Dxb2 12. Dxc8 Dxb1+
13. Txb1[=wD] Dxc8 14. Dxb7 Dxc2 15. Dxe7+ Kxe7 16. Lxe2[=wT]+ Dxe2+ 17.
Kxe2

I used a computer to construct this PG. As I used hash tables the program
might give PGs where moves can be transposed, so the resulting PGs must be
checked
manually for move transpositions. In this case no transposition seem
possible.

Cheers,

Gerd Wilts