1.Nf3 Nc6 2.d4 e6 3.e4 b6? [ 3...d5 4.Nc3 Bb4 5.Bd3 Nf6 6.exd5 exd5 7.0-0+/= George Thomas vs Aaron Nimzowitsch 1927 is an old game which Black famously went on to win after Sir George blundered a piece.]

4.c4 Bb7 5.Nc3 Nf6 6.a3? [ 6.e5 Ng8 7.d5 Nce7 8.Be2+- looks comfortable for White]

6...d6 7.Bd3 e5? this blocks the middle and both of Black's bishops.

8.d5 Ne7 9.0-0 Ng6 10.Ne1!? in order to free f4.

10...c5? 11.Bc2 Be7 12.Ba4+ Nd7 13.Qg4 Bc8! 14.Nd3? [ 14.Bc6! Rb8 15.Nb5 a6 16.Na7 Bb7+- leaves Black tied down.]

14...0-0 15.f4? Nf6? [ 15...exf4 16.Nxf4 Nde5 17.Qe2 Bf6=/+ lets Black out.]

16.Qe2 Bg4 17.Qf2 Bd7 18.f5 Nh8? [ 18...Nf4+/- loses a Pawn but keeps the position.]

19.Bd1! a6 20.g4! g5?? opening up the Kingside is fatal.

21.h4 h6 22.hxg5 hxg5 23.Bxg5 Nxe4? [ 23...Nxg4 24.Bxe7 Nxf2 25.Bxd8 Nxd3 26.Bxb6+/= forces the Queens off for a Pawn.]

24.Nxe4 Bxg5 25.f6!! Bf4 26.Nxf4 exf4 27.Qxf4 Kh7 28.Rf2 is mate in four. 1-0