BDS & Michael McDowell

2nd Comm., Phénix, 1994

Mate in 2

LEOs b2,c3; a6

PAOc1

VAOc7

1.LEh8!  (2.Sc3#)
 
1...Kc6  2.LEh1#
1...Kc4  2.LEg8#
1...Ke5  2.LEh5#
1...LEc4 2.Sf6#			

The into-the-corner key gives the black king three flights on two lines. All the mates after the flights are given by the key-piece, producing a duel between the black king and the white leo. Apart from having to use two white leos (which are nevertheless both fully utilised), the construction worked out rather well.