Correct answer: Na61...Ra5[a] 2.R:a5#[A] 1...Ra4/[б]/ 2.R:a4#[Б] 1...Ra3[c] 2.R:a3#[C] 1...Ra6 2.R:a6# 1.Nd3? zz 1...Ra5[a] 2.R:a5#[A] 1...Ra4/[б