Black to Play
Solution below ↓
Tactical Motif: Pin.
A pin is a tactical idea where you attack a piece or pawn, but moving it will expose an even more valuable piece behind it.
1…Rd4 attacks the white queen. However, the queen cannot move because it is pinned to the king.
The best White can do is 2. Qxd4, trading the queen for the rook.
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