BDS
Darnall & Handsworth Bulletin, 1986
#4
1.Bg4! (2.Qe1#) 1...fxg4 2.Qa1 (3.Qh8#) Rxa1 3.Rc7 & 4.Rh7# Rb2 3.Qxb2 & 4.Qh8# 1...fxe3 2.Qe1+ Kxg4 3.Qg3+ Kh5 4.Qh3# 1...Ra1 2.Qxa1 (3.Qh8,Qe1#) fxe3 3.Rg2 & 4.Qh8,Qe1# 2.Qb2 (3.Qh8#) fxe3 3.Rg2 & 4.Qh8#
I seem to remember this is a version of an old 19th Century problem that was unsound. The dual is very unfortunate, but I couldn’t see any way of eliminating it.
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