Use the fact that the rook is pinned, and that the king has few squares left; I'm thinking that 1.Rd8 Kd3 (only possible move) 2.Nc5# should be the solution.

Use the fact that the rook is pinned, and that the king has few squares left; I'm thinking that 1.Rd8 Kd3 (only possible move) 2.Nc5# should be the solution.

[White "NN"]
[Black "NN"]
[FEN "7R/1B1N4/8/3r4/1K2k3/8/5Q2/8 w - - 0 1"]

1.Rd8 Kd3 2.Nc5#