BDS
Probleemblad, 2002
#2
PAOs e4; b4
VAOs b3, b5
1.PAe1! (2.Rd5#) 1...Sc4 2.Be3# 1...PAc4 2.Be4# 1...VA5c4 2.Be2#
The strong key sets up a potential anti-battery. After each black defence, White must place his hurdle on the only one of e2, e3 and e4 that Black can still move to.
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