Pert-Chandler
Terence Chapman Match London 2000
Queen's Indian E12
Notes by John Emms

1 d4 Nf6 2 Nf3 e6 3 c4 b6 4 a3 Ba6 5 Qc2 Bb7
On first sight it seems a little silly to move the bishop twice in succession, but Black's plan is quite common and well motivated. By inducing the queen to c2, Black lessens White's control over the d5-square and now aims to hit back in the centre with ...c7-c5, without allowing the advance d4-d5.
6 Nc3 c5 7 e4 cxd4 8 Nxd4 Nc6 9 Nxc6 Bxc6 10 Be2
In game 5 Pert chose 10 e5. I believe it was the Dutch GM Jeroen Piket who first tried this natural move.Pert quickly obtained a decisive advantage after 10 ..Ng4?! 11 Qe2 f5 12 h3 Qh4 13 g3 Qh5 14 Rg1 Bc5? 15 Be3 and Black was forced to give up a piece. Probably 10 Ng8 is a safer choice.
10...Qc7 11 f4 Bc5 12 b4
This is the first new move of the game. Lputian-Timman, Belgrade 1999 continued 12 Bd2 e5 13 Rf1 Bd4 14 0-0-0 0-0 15 g4 which Black eventually won, although at this stage the position remains very unclear.
12...Bd4 13 e5 Bxc3+
13...Nd5!? looks enticing, as 14 cxd5 runs into 14...Ba4!. However, after 14 Ne4! Nxb4 15 axb4 Bxa1 16 Nd6+ Kf8 17 Be3 it's Black who's in trouble.
14 Qxc3 Ne4 15 Qe3 0-0 16 0-0 f6!
Black must fight back in the centre.
17 exf6 Nxf6 18 Bb2 Qb7 19 Qg3 Be4 20 Rad1 Rac8 21 Rd6 Rf7?
After this move Black is condemned to a passive defence. 21...Kh8! would have prevented White's next move.
22 f5! Rcf8
After 22...Bxf5 23 Rxf5! exf5 24 Rxf6 White's bishop pair outweigh the rook.
23 fxe6 dxe6 24 Bxf6!
24 Rxe6? Nh5! gives Black a dangerous attack.
24...Rxf6 25 Rxf6 Rxf6 26 Qe5 Qe7 27 Bg4 Kf7 28 c5 bxc5 29 bxc5
The pressure on the e6-pawn, coupled with the dangerous passed c-pawn, gives White a undisputed advantage. 29...Bb7 30 c6 Bc8 31 h3 g6 32 Rd3 h5 33 Bf3 Rf5 34 Qh8! Qc5+ 35 Kh1 Re5 36 Rd1 Qa5 37 Qxc8 Re1+ 38 Rxe1 Qxe1+ 39 Kh2 Qe5+ 40 g3 h4 41 Qd7+ 1-0
42 Qd8+ will follow.