[Retros] Massacre PGs

[Francois Labelle]

paul raican wrote:


> Is this a valid "massacre at home" PG?(after Wilts & Geissler)

>

> ke1 ra1 pa2 - ke8 ra8

> (3+2)      PG in 18


At ply 31, x=4, there are 229895 positions. That's a lot of positions with
5 pieces on the board to choose from. 10 of them are just 2 plies away
from your position:

1r2k3/8/8/8/8/8/P7/3RK3   (5 ways)
1r2k3/8/8/8/8/8/P7/R2K4   (5 ways)
1r2k3/8/8/8/8/8/P4K2/R7   (116 ways)
1r2k3/8/8/8/8/8/P2K4/R7   (36 ways)
r7/4k3/8/8/8/8/P2K4/R7    (2236 ways)
3rk3/8/8/8/8/8/P3K3/R7    (36 ways)
1r2k3/8/8/8/8/8/P3K3/R7   (1510 ways)
1r2k3/8/8/8/8/8/P7/1R2K3  (21 ways)
r7/4k3/8/8/8/8/P7/2R1K3   (48 ways)
r2k4/8/8/8/8/8/P7/2R1K3   (15 ways)

Which means that there are at least 4028 ways to reach your position in
just 16.5 moves.

	Francois