As Bill Forster suggested in "NZ Chess", before this game I was still having nightmares about not finishing off (and even losing) a completely won position against Anthony in the New Zealand Championships - a game that cost me the title. This time I was determined to a) play actively and b) follow through if I did reach a winning position. Credit to Bill again for his description on the tournament website of the return match as "sweet utu".
1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.h3 0-0 6.Be3 a6 7.a4 b6 8.e5 Nfd7 9.e6 fxe6 10.h4 Nf6 11.h5 Nxh5 12.Bd3 My book ended here, with the view that "white has good attacking chances". Maybe the infernal machine wouldn't agree, but thankfully this was a game between two humans!
12...Nc6?! Black goes wrong immediately. The idea was to eliminate the white bishop with ...Nb4, but this is too slow. Better [12...Nf6 or; 12...Nf4 ]
13.Ng5! Attack! Nxh7 and Rxh5 are two threats.
13...Nf4 14.Bxf4 Rxf4 15.g3! Deflection.
15...Rxd4? It was necessary to stay on the f-file and give up an exchange by e.g. [15...Rf5 ]
16.Qf3! With virtually unstoppable threats of Qxc6 or Qf7+, followed by Rxh7#.
16...Qe8 17.Rxh7 Black has no real answer to Qh1, followed by Rh8+, Qh7+ and Qxh8#.
17...Rd5 18.Nxd5 exd5 19.Qh1 e6 Unlike our NZ Championship game, I had plenty of time here, and spent 10 or 15 minutes calculating and checking the winning line. ([Bill Forster] Whilst converting this from .pdf to .pgn I am going to take the opportunity to confirm this with an anecdote - I happened to arrive at the club to spectate whilst Bob was contemplating this position - suddenly I started worrying that I'd not closed the garage door - so I drove home, found that it was closed (naturally) and drove back - Bob was still looking at the same position)
20.Rh8+! Bxh8 21.Qh7+ Kf8 22.Qxh8+ Ke7 23.Qg7+ Kd8 24.Nf7+! Kd7 25.Ne5+ Kd8 26.Bxg6 Black's 'best' is [26.Bxg6 Nxe5 27.Bxe8 Kxe8 28.0-0-0! with mate not far away.] 1-0