[Retros] Two little SPG-challenges

[Mario Richter]

Hello,

first of all thanks to Michel for providing the information
about the current records for the (N, N+k) proof game task.

Michel> And the "human" chase to the longest LS-SPG can be opened!
Michel> Some subcategories can be thought of :

Michel> 1) absolute ; my bet : some promoted force on the board...
Michel> 2) without apparent promoted piece
Michel> 3) At-Home-SPG

Michel> any suggestion for possible 4)?

Not a suggestion for 4), but for a subcategory of 1+2:

LS-SPG ending in mate.

Example:

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

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

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

|*P |*P | S |*P |*P |*P |*P |*P |

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

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

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

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

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

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

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

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

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

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

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

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

+---+---+---+---+---+---+---+---+  (15 + 14)

r1bskbsr/ppSppppp/8/8/8/8/PPP2PPP/RSBQKBSR

SPG in 6.5 moves


On my second attempt popeye is working now for more then
12 hours. Maybe you can be faster in cooking it?

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

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

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

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

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

|   | . |   | . |   | . | Q | . |

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

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

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

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

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

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

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

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

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

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

+---+---+---+---+---+---+---+---+ (12 + 11)

1sbqkbsr/p1ppp3/6Q1/8/8/8/1PPP1P1P/RSB1KBS1

SPG in 10.5 moves


greetings
   mario