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Puzzle D3: White to move and win

To see the hint or solution, drag your mouse accross a box below while holding down the left mouse button.

HINT:

White can promote the Pawn, and avoid stalemating too.

SOLUTION:

1.c7 Rd6+   2.Kb5 Rd5+   3.Kb4 Rd4+   4.Kb3 Rd3+   5.Kc2 Rd4   6.c8=R! Ra4   7.Kb3 winning the Rook, with mate to follow in 5 moves.