Daily Chess Improvement: Find the knockout punch! Chess tactic, Puzzle Solving White to move. Can you find the knockout blow? Source: ChessToday.net
Rxd7 either Qd7 or Kd7
Bb5 wins
of course R:d7 is a winner!!!
After reading a little of her book, on, “Tactics for Champions” and seeing about tactical motifs, I agree with your walirlan because after 1.Rxd7, when black takes back, white automatically wins the Q by pinning it with 2.Bb5