[Retros] The problemist, march 2007

[Joost de Heer]

R383 - Eugene Dugas
8/8/8/3P4/4k3/1p2P3/6K1/8
+---+---+---+---+---+---+---+---+

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

+---+---+---+---+---+---+---+---+
  3 + 2
White and black retract, then black can h#1. Why?

R384 - Alexander Yarosh
2qrrkB1/K1pppr1b/p3SPRQ/5pRp/P5p1/3P4/1PP1PP1P/8
+---+---+---+---+---+---+---+---+

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

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

| K |   |*P |*P |*P |*R | . |*B |

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

|*P | . |   | . | S | P | R | Q |

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

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

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

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

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

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

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

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

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

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

+---+---+---+---+---+---+---+---+
  14 + 13
Legal position?

F2544 - Stephen Emmerson
dedicated to Peter Fayers
rsbqk1sr/p1pppp1p/8/1p6/6p1/8/PPPPPPPP/RSBQKBSR
+---+---+---+---+---+---+---+---+

|*R |*S |*B |*Q |*K | . |*S |*R |

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

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

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

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

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

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

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

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

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

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

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

| P | P | P | P | P | P | P | P |

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

| R | S | B | Q | K | B | S | R |

+---+---+---+---+---+---+---+---+
  16 + 15
Proofgame in 4.5 moves (b) -bPg4
Vertical Möbius Strip

VMS: The vertical edges of the board are imagined to be fixed to each 
other as in a Vertical Cylinder, but after having been twisted so that 
the 1-8 ranks on one side are adjacent to the 8-1 ranks on the other. 
Possible movements are bRa8xh1, bBc8-b7-a6-h4-g5-f6-e7-d8, bSg8xa2.