The long tail of a won game

[Event "39th Zurich Christmas"]

[Site "Zurich SUI"]

[Date "2015.12.27"]

[Round "-"]

[White "Kurmann,O"]

[Black "Goldie,Thomas"]

[Result "1-0"]

[BlackElo "2243"]

[ECO "B90"]

[EventDate "2015.12.26"]

[WhiteElo "2435"]

[BlackFideId "2054485"]

[Opening "Sicilian"]

[Variation "Najdorf, Byrne (English) attack"]

[WhiteFideId "1308173"]

[WhiteTitle "IM"]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 e5 7.Nb3 Be6 8.h3 Be7

9.Qf3 O-O 10.g4 b5 11.g5 Nfd7 12.h4 Nc6 13.O-O-O Rc8 14.Kb1 Na5 15.Nd5

Bxd5 16.exd5 Nc4 17.Bc1 f5 18.gxf6 Nxf6 19.Rg1 Re8 20.Bh3 Rc7 21.Be6+ Kh8

22.h5 Bf8 23.Rg5 a5 24.Rdg1 Rxe6 25.dxe6 Qe7 26.Qf5 a4 27.Nd2 Rc5 28.b3

e4 29.Qh3 Ne5 30.Ba3 Rd5 31.Qe3 h6 32.Rf5 Nc4 33.Nxc4 (33.bxc4 Rxd2 34.Qxd2

b4 35.Bb2) 33...Rxf5 34.Nxd6 Qxe6 (34...Rd5 35.Nf7+ Kg8 36.Bxe7 Bxe7 37.Qxh6

Ne8 38.Qh8#) 35.Nxf5 Bxa3 36.Nxg7 Qe5 37.c3 Nd5 38.Qxh6+ {Black

resigns.} Kg8 39.Nf5+ Kf7 40.Rg7+ Ke8 {The toughest.} (40...Qxg7 41.Qxg7+)

(40...Kf8 41.Qh8#) 41.Qc6+ Kf8 42.Qc8+ Qe8 43.Rg8+ Kxg8 44.Qxe8+ Bf8 45.Qe6+

(45.Qg6+ Kh8 46.h6 Ne7) 45...Kh8 46.Qxd5 {A quick checkmate is

still not possible despite the exposed nature of black's position.}   1-0

I see mate in 4