Mate in 10

The following game was brought to our attention by a frequent correspondent. It was played in a match in February 1950, and is notable for the '10 move combination' that was made. Annotations by the winner, Gruengard. 

Dr. Y. Gruengard - L. Braun

QGD (D40)

Match, February 1950
Source: Davar, Feb. 17th, 1950, p. 29.
Annotations: Y. Gruengard

1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5 Nbd7 5.e3 Be7 6.Nbd2 Capablanca's idea: to capture on f3 with a knight and not a bishop to gain a tempo. 6...a6 To develop the QN pawns while threatening White's pieces, but White prevents this. 7.c5 c6 8.b4 b6 9.Qa4 Bb7 10.cxb6 Qxb6 11.Rb1 0–0 12.Bd3 Rfd8 13.0–0 h6 Black tries to free himself from the heavy pressue on his position. 14.Bh4 g5 ...but at a price of weakening the KS. 15.Bg3 Nh5 To take the B and prepare a center break with e5. 16.Ne5! Denying Black's hope. 16...Nf8 17.Qd1! The Q finished her role on the QS, so she moves quickly to exploit the KS's weaknesses. 17...Nxg3 Better is 17...Ng7. 18.fxg3 f6 Better is 18...f5 immediately. 19.Qh5! f5 19...fxe5? 20.Rxf8+ Bxf8 21.Qg6+ Bg7 22.Rf1 e4 23.Rf7 and mates. 20.g4 Bd6 21.Nf7 Qc7 Now white has a mate in 10 combination.

22.Nxh6+ Kg7 23.Qxg5+ Kh7 24.Qg8+! Kxh6 25.g5+ Kh5 26.Be2+ Kh4 27.Nf3+ Kh5 28.Ne5+ Kh4 29.g3+ As he saw mate already, White didn't notice the quicker 29.Rf4#... 29...Kh3 30.Rf4 Ng6 31.Bf1# 1–0