Solution
13. ♝g4 ♞d4 14. ♝xd7+
The position
This beginner puzzle (rating 998) asks White to move to find the winning idea. It features these themes: Middlegame, Pin.
It is White to move. Look for the tactic hiding in the position — Middlegame, Pin. Drag a piece on the board to play your move; the puzzle will tell you if you found the best continuation.
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