Solution
51. ♜xa6 g3+ 52. ♚h1 ♜xa6 53. b8=♛+
The position
This advanced puzzle (rating 1876) asks White to move to find the winning idea. It features these themes: Promotion.
It is White to move. Look for the tactic hiding in the position — Promotion. Drag a piece on the board to play your move; the puzzle will tell you if you found the best continuation.
Take 50,000 puzzles anywhere
Get Chess Puzzles Trainer for iPhone and iPad — the same puzzles, offline, with progress tracking and spaced repetition.