(30.11.2014) Excellent using of the fairy condition Back to Back - Albino and four different fairy mates.

1.Bg2 fxg3 2.Ke4 e5#

1.Qe2 fxe3+ 2.Kc4 c5#

1.Qd3 f3 2.Bf2 fxd5#

1.Kd3 f4 2.Rf3 d4#

Albino, echo model mates on four different squares, made possible by four different black officers (Author)

Back-to-Back: When pieces of opposite colors stand back-to-back with each other on the same file, they exchange their roles. P on the first rank cannot move. Any piece can make an en passant capture when it is given a power to move as P by BTB.