Sv.Johnsen - G.Nesheim
Gausdal Open Ch NOR, 1985
1.e4 c5 2.c3 Nf6
Recently Tarrasch' old 2...Qa5 has had a small boost in popularity. After 3.Nf3 Nc6 some notable continuations are:
a) 4.Na3 e6 5.Nc4 Qc7 6.d4 cxd4 7.Nxd4 a6 8.Bd3 b5 9.Ne3 Nf6 = Alapin-Tarrasch, Vienna 1898.
b) 4.Bc4 d6 5.Qe2 Nf6 6.h3 e5 7.0–0 Be7 = Rainfray-Movsesian, France 2003.
c) 4.g3 Nf6 5.Qe2 d5 6.exd5 Nxd5 7.Bg2 Bg4 8.h3 Bh5 9.0–0 e6 = Rozentalis-Movsesian, Hastings 1996.
3.e5 Nd5 4.d4 cxd4 5.Nf3 Qa5?! (Dia)
6.Qxd4 appears less logical. After 6...Nc6 7.Qe4 e6 8.Bd3 f5 9.Qe2 Qa4 10.h3 Nf4 11.Bxf4 Qxf4 chances were equal in Tzoumbas-Skembris, Liosia 1991.
I think I had a faint hope of 6...Nc6 7.Nb3, which actually happened in Arslanov-Nozdrachev, Russian Ch U12 2004.
This appears more logical than 7.Bc4 Nb6 8.Bb5 a6 (8...Nc6 9.a4 Nd5 10.0–0 a6 11.Bxc6 bxc6 12.Na3 += Donets-Khatenever, St Petersburg 2005) 9.b4 Bxb4 10.cxb4 Qxb4+ 11.Qd2 Qxd2+ 12.Bxd2 axb5 13.Nxb5 Na6 14.Nd6 += Stojic-Edwards, Canberra 2003.
Burgess notes that White is better after 7...a6 8.Nc4 Qc5 9.Qg4 as well as 7...d6 8.Nc4 Qd8 9.Nxd6+ Bxd6 10.Bb5+.
8.Nc4 Qd8 9.Nb5 Bc5
9...Be7 10.Nbd6+ Kf8 11.Qh5 g6 12.Bh6+ Kg8 13.Qf3 Bxd6 14.Nxd6 transposes to 9...Bc5 10.Nbd6+ Kf8 11.Qh5 g6 12.Bh6+ Kg8 13.Qf3 Bxd6 14.Nxd6 (note to Black's 11th move).
10.Nbd6+ Kf8 11.Qh5 (Dia)
This loses a piece. Black had to try 11...g6 12.Bh6+ (12.Qh6+ Kg8 13.Bg5 Qf8 14.Qxf8+ Kxf8 15.Ne4 Be7 16.Bh6+ Kg8 17.f4 is good too) 12...Kg8 13.Qf3 Bxd6 when Burgess considered 14.Nxd6 dubious because of 14...Nxe5 but actually 15.Qe4 Nc6 16.0–0–0 is very good for White. An important line is 16...Qe7? which surprisingly loses to 17.Rxd5! exd5 18.Qxe7 Nxe7 19.Bd3 when Black is helpless. Instead Black must try 16...f5 but 17.Qc4 Nf6 18.Be2 clearly is better for White. Thanks to Rybka for assisting me with these lines!
12.Bg5 f6 13.exf6 1–0
(after 13...Nxf6 14.Bxf6 gxf6, White picks up the loose piece with 15.Qxc5)