1. Rb4! Qf5 2. g4 traps the black queen.
This tactical idea is based on two important observations:
- White can play Rb4 because the knight on d5 is pinned.
- The black queen is in a vulnerable situation and already limited in mobility. High-valued pieces are often targets in tactical combinations.
1. Rb4 Qxb4 2. Bxb4 and white will be ahead in material.