Correct answer: B:g71...Ra3 2.R:a3# 1...Ra4 2.R:a4# 1...Ra5 2.R:a5# 1...Ra6+ 2.R:a6# 1...Ra7 2.R:a7# 1...R:a8 2.Q:a8# 1...g6/g5 2.B:b2# 1...Q<