% Francois Labelle & computer, February 25, 2012
% All 2 PG-4.0 SPG-2.5 with exactly 1 solution in 4.0 moves.
% Both have:
% - 2 solutions in 2.5 moves
% - 2 solutions in 3.0 moves
% - 1 solution in 3.5 moves
% - 1 solution in 4.0 moves.


(Forsyth-Edwards Notation, followed by the same list in ascii diagrams)

PG-4.0, SPG-2.5:

rn1qkbnr/ppp1pppp/8/3p4/8/5N1P/PPPPPP2/RNBQKB1R
rnbqk1nr/pppp1ppp/8/4p3/8/P1N5/2PPPPPP/R1BQKBNR

 _________________ _________________ 
|                 |                 |
| r n . q k b n r | r n b q k . n r |
| p p p . p p p p | p p p p . p p p |
| . . . . . . . . | . . . . . . . . |
| . . . p . . . . | . . . . p . . . |
| . . . . . . . . | . . . . . . . . |
| . . . . . N . P | P . N . . . . . |
| P P P P P P . . | . . P P P P P P |
| R N B Q K B . R | R . B Q K B N R |
|_________________|_________________|