Chess/Puzzles/Middlegame/Match 3

Starting from the following position, white starts and wins.

a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h

Position from move 12 of W. Stienitz vs. J. Rock (1863).

Solution