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BDS

Sachová skladba, 2014

#2
PAOs b5, g8; h8:
MAOs g5; h3

1.PAb2!     (2.Qb3#)

1...Qf5+     2.gxf5#
1...PAxh5+   2.gxh5#
1...hxg3     2.Sxh7#
1...Qxe4     2.Sxe4#
1...Sxg3,Sf2 2.Q(x)f2#
1...Kxg3     2.Qe3#

The key puts another guard on f2, allowing the wQ to unguard it in the threat. The key also exposes the wK to two checks, which lead to mates from the wMA/wP battery. There are two further battery mates, this time from the wR/wS battery. Finally, captures on the flight at g3 lead to queen mates.