BDS
diagrammes, 1990
#4
1.Bxe4! 1...c6 2.Bd4 Kxe4 3.Rf1 Kxd4 4.Rf4# 1...Kxe4 2.Rf1 c6 3.Bd4 Kxd4 4.Rf4#
After I'd done the double knight sacrifice and the double rook sacrifice, I just had to do the double bishop sacrifice.
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