% Francois Labelle & computer, January 30, 2004 % All 25 checkmate PG-3.0 with exactly 2 solutions. % They are all SPGs. (Forsyth-Edwards Notation, followed by the same list in ascii diagrams) SPG-3.0: rnb1k1nr/pppp1ppp/8/4p3/5PPq/N7/PPPPP2P/R1BQKBNR rnb1k1nr/pppp1ppp/4p3/8/5PPq/N7/PPPPP2P/R1BQKBNR rnb1k1nr/pppp1ppp/8/4p3/6Pq/N4P2/PPPPP2P/R1BQKBNR rnb1k1nr/pppp1ppp/4p3/8/6Pq/N4P2/PPPPP2P/R1BQKBNR rnb1k1nr/pppp1ppp/8/4p3/5PPq/P7/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/4p3/8/5PPq/P7/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/4p3/8/1P3PPq/b7/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/8/4p3/1P3PPq/b7/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/8/4p3/6Pq/P4P2/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/4p3/8/6Pq/P4P2/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/4p3/8/1P4Pq/b4P2/P1PPP2P/RNBQKBNR rnb1k1nr/pppp1ppp/8/4p3/1P4Pq/b4P2/P1PPP2P/RNBQKBNR rnb1kbnr/pppp1ppp/8/8/5P1q/8/PPPPP2P/RNBQKBNR rnb1kbnr/pppp1ppp/8/8/4P1Pq/8/PPPPP2P/RNBQKBNR rnb1kbnr/pppp1ppp/8/4p3/1q6/2KP4/PPP1PPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/4p3/8/1q6/2KP4/PPP1PPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/8/4p3/5q2/3PK3/PPP1PPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/8/4p3/4q3/8/PPPPKPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/4p3/4P3/4q3/8/PPPPKPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/4p3/8/4q3/8/PPPPKPPP/RNBQ1BNR rnb1kbnr/pppp1ppp/4p3/8/4q3/8/PPPPKPP1/RNBQ1BNR rnb1kbnr/pppp1ppp/8/4p3/4q3/8/PPPPKPP1/RNBQ1BNR rnb1kbnr/pppp1ppp/4p3/8/3q4/8/PPPKPPPP/RNB1QBNR rnb1kbnr/pppp1ppp/4p3/8/3P4/2Q5/PPP1PPPP/RNq1KBNR rnb1kbnr/pppp1ppp/8/4p3/3P4/2Q5/PPP1PPPP/RNq1KBNR _________________ _________________ _________________ _________________ | | | | | | r n b . k . n r | r n b . k . n r | r n b . k . n r | r n b . k . n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . . . . . | . . . . p . . . | . . . . . . . . | . . . . p . . . | | . . . . p . . . | . . . . . . . . | . . . . p . . . | . . . . . . . . | | . . . . . P P q | . . . . . P P q | . . . . . . P q | . . . . . . P q | | N . . . . . . . | N . . . . . . . | N . . . . P . . | N . . . . P . . | | P P P P P . . P | P P P P P . . P | P P P P P . . P | P P P P P . . P | | R . B Q K B N R | R . B Q K B N R | R . B Q K B N R | R . B Q K B N R | |_________________|_________________|_________________|_________________| | | | | | | r n b . k . n r | r n b . k . n r | r n b . k . n r | r n b . k . n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . . . . . | . . . . p . . . | . . . . p . . . | . . . . . . . . | | . . . . p . . . | . . . . . . . . | . . . . . . . . | . . . . p . . . | | . . . . . P P q | . . . . . P P q | . P . . . P P q | . P . . . P P q | | P . . . . . . . | P . . . . . . . | b . . . . . . . | b . . . . . . . | | P . P P P . . P | P . P P P . . P | P . P P P . . P | P . P P P . . P | | R N B Q K B N R | R N B Q K B N R | R N B Q K B N R | R N B Q K B N R | |_________________|_________________|_________________|_________________| | | | | | | r n b . k . n r | r n b . k . n r | r n b . k . n r | r n b . k . n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . . . . . | . . . . p . . . | . . . . p . . . | . . . . . . . . | | . . . . p . . . | . . . . . . . . | . . . . . . . . | . . . . p . . . | | . . . . . . P q | . . . . . . P q | . P . . . . P q | . P . . . . P q | | P . . . . P . . | P . . . . P . . | b . . . . P . . | b . . . . P . . | | P . P P P . . P | P . P P P . . P | P . P P P . . P | P . P P P . . P | | R N B Q K B N R | R N B Q K B N R | R N B Q K B N R | R N B Q K B N R | |_________________|_________________|_________________|_________________| | | | | | | r n b . k b n r | r n b . k b n r | r n b . k b n r | r n b . k b n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . . . p . . . | | . . . . . . . . | . . . . . . . . | . . . . p . . . | . . . . . . . . | | . . . . . P . q | . . . . P . P q | . q . . . . . . | . q . . . . . . | | . . . . . . . . | . . . . . . . . | . . K P . . . . | . . K P . . . . | | P P P P P . . P | P P P P P . . P | P P P . P P P P | P P P . P P P P | | R N B Q K B N R | R N B Q K B N R | R N B Q . B N R | R N B Q . B N R | |_________________|_________________|_________________|_________________| | | | | | | r n b . k b n r | r n b . k b n r | r n b . k b n r | r n b . k b n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . . . . . | . . . . . . . . | . . . . p . . . | . . . . p . . . | | . . . . p . . . | . . . . p . . . | . . . . P . . . | . . . . . . . . | | . . . . . q . . | . . . . q . . . | . . . . q . . . | . . . . q . . . | | . . . P K . . . | . . . . . . . . | . . . . . . . . | . . . . . . . . | | P P P . P P P P | P P P P K P P P | P P P P K P P P | P P P P K P P P | | R N B Q . B N R | R N B Q . B N R | R N B Q . B N R | R N B Q . B N R | |_________________|_________________|_________________|_________________| | | | | | | r n b . k b n r | r n b . k b n r | r n b . k b n r | r n b . k b n r | | p p p p . p p p | p p p p . p p p | p p p p . p p p | p p p p . p p p | | . . . . p . . . | . . . . . . . . | . . . . p . . . | . . . . p . . . | | . . . . . . . . | . . . . p . . . | . . . . . . . . | . . . . . . . . | | . . . . q . . . | . . . . q . . . | . . . q . . . . | . . . P . . . . | | . . . . . . . . | . . . . . . . . | . . . . . . . . | . . Q . . . . . | | P P P P K P P . | P P P P K P P . | P P P K P P P P | P P P . P P P P | | R N B Q . B N R | R N B Q . B N R | R N B . Q B N R | R N q . K B N R | |_________________|_________________|_________________|_________________| | | | r n b . k b n r | | p p p p . p p p | | . . . . . . . . | | . . . . p . . . | | . . . P . . . . | | . . Q . . . . . | | P P P . P P P P | | R N q . K B N R | |_________________|