% Francois Labelle & computer, January 30, 2004
% All 8 mirror-symmetric PG-3.5 with exactly 2 solutions.
%   1 SPG-3.5
%   7 PG-3.5, SPG-3.0


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

SPG-3.5:

rnb1kbnr/Qp1ppppp/2p5/8/8/2P5/qP1PPPPP/RNB1KBNR

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


PG-3.5, SPG-3.0:

rnq1kbnr/pbpppppp/1p6/8/8/1P6/PBPPPPPP/RNQ1KBNR
rnq1kbnr/p1pppppp/bp6/8/8/BP6/P1PPPPPP/RNQ1KBNR
r1b1kbnr/pppnpppp/3q4/3p4/3P4/3Q4/PPPNPPPP/R1B1KBNR
rnb1kbnr/p2ppppp/1pp5/q7/Q7/1PP5/P2PPPPP/RNB1KBNR
rnb1kbnr/ppp1pppp/2qp4/8/8/2QP4/PPP1PPPP/RNB1KBNR
rnbq1knr/pppppp1p/6pb/8/8/6PB/PPPPPP1P/RNBQ1KNR
rnbq1knr/ppppppbp/6p1/8/8/6P1/PPPPPPBP/RNBQ1KNR

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