1.d4 Nf6 2.Bg5 c5 3.Bxf6 exf6 I don't like this recapture, because it weakens control of d5, cf. Karpov vs Browne, 1972

4.e3? [4.c3] 4...Qb6! 5.b3 Now White will miss his dark-squared B

5...Nc6 6.Nf3 d5 7.Be2 Be6 8.0-0 g6 Not sure of the point of this.

9.Nc3 It is worth noting that when a piece occupies a square, it no longer controls it. So this move makes the dark Q-side squares weak.

9...cxd4 10.Nxd4 Nxd4 11.exd4 Rc8 12.Na4 Qa5 13.Bf3 b5 14.Nb2 [14.Nc5 gives up a pawn, but Black's extra pawn would be doubled and he would need to give up the unopposed dark-squared B]

14...Qc3 15.Qd3 White is already reduced to desperate expedients 15...Qxd3 [15...Qxb2 16.Qxb5+ Kd8 17.Bxd5 Qxc2 should not be enough for White, but Black plays more safely] 16.Nxd3 Bd6 17.a4 [White's best chance was still 17.Nc5 because later on, he has to jettison material without any alleviation of Black's pressure]

17...b4 18.g3 a5 19.Ra2 Kd7 20.Ne1 passive defence is just waiting for the guillotine blade to fall, and Fenny was very much up to the task of pulling the final lever

20...Rc3 21.Bd1 Bb8 22.Kg2 Ba7 23.Nf3 Rhc8 24.Ng1 Bf5 25.Ne2 R3c6 26.Nf4 Kd6 27.Bf3 Be6 28.Rc1 g5 29.Nd3 Bxd4 now the pawn fell and Black kept his mighty B 30.Ne1 Bc3 31.Kf1 Bd2 32.Rd1 Bxe1 33.Kxe1 Rxc2 34.Rxc2 Rxc2 35.Rd3 Kc5 36.Bd1 Rb2 37.Rd2 Rb1 38.Ke2 Rc1 39.Rc2+ Rxc2+ 40.Bxc2 h6 41.Ke3 g4 Although there is a rule of thumb in same coloured B endings to put your pawns on the opposite colour to your B, there are times when putting them on the same colour restricts the enemy B.

In this position, it also pins down the remaining White pawns, setting up a zugzwang 42.Bd1 h5 43.Bc2 Bc8 44.Bd3 Bb7 45.Be2 d4+ 46.Kd2 Bd5 47.Bd1 Be4 48.Be2 Kd6 49.Bd1 d3 see, the White B is out of moves.

50.Ke3 Ke5 51.f3 gxf3 52.h3 f5