White move and win

[FEN "4r3/6P1/p1p4k/4B2p/4Q3/1P2b1qP/P1P3P1/5R1K w - - 0 48"]

Solution

[Index of Chessprints]

Solution
 

Lange,M - Schultz,G [C72] Duesseldorf HT Duesseldorf, 1863 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.0-0 Bd7 6.d4 Nxd4 7.Bxd7+ Qxd7 8.Nxd4 exd4 9.Qxd4 Nf6 10.Nc3 Be7 11.b3 0-0 12.Bb2 c6 13.Rad1 Rad8 14.f4 Ne8 15.Rd3 Qe6 16.Qb6 Qd7 17.Kh1 f5 18.e5 Qc7 19.Qd4 dxe5 20.Qc4+ Kh8 21.Rxd8 Bxd8 22.Qc5 Be7 23.Qxe5 Bd6 24.Qd4 Nf6 25.Ne2 Ne4 26.Qe3 Re8 27.Ng1 Qd8 28.Qd4 Qe7 29.Nh3 Bc5 30.Qd1 Qh4 31.Qd7 Qe7 32.Qxf5 Nf2+ 33.Nxf2 Bxf2 34.Be5 Bb6 35.Rd1 Rd8 36.Re1 Bd4 37.h3 Qh4 38.Rf1 Bb6 39.Qf7 Qg3 40.Qxb7 Be3 41.Qe7 Rg8 42.f5 Qg5 43.f6 h5 44.fxg7+ Kh7 45.Bf6 Qg3 46.Qe4+ Kh6 47.Be5 Re8 [Diagram] Here Max Lange played the cute under-promotion, which still wins, and Schultz resigned. 48.g8=N+ 1-0

But in his haste, Lange overlooked a mate-in-six: 48.Rf6+ Kxg7 49.Rg6+ Kf8 (49...Kf7 50.Qf5+ Ke7 51.Qe6+ Kd8 52.Qd6+ Kc8 53.Qc7#) 50.Qf5+ Ke7 51.Qe6+ Kd8 52.Qd6+ Kc8 53.Qc7#

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