Correct answer: b71...Rb8 2.a:b8N# 1...Rd8 2.e:d8N# 1...R:e8 2.f:e8Q#/f:e8B# 1.b7! (2.b:a8Q#/b:a8B#) 1...R:a7 2.b8N# 1...Rb8 2.a:b8N#
