Bastian,J (2225) - Tay,J (2416) [C25]
ICCF EM/M/A092, 2000

What do I know about the Dunst Opening? I've seen OTB FM Ong Chong Ghee play this in blitz games...even had one game against him via transposition (1.e4 d5 2.Nc3 e6 3.d4 dxe4 - French Rubinstein!- Cairnhill 96). Morozevich tried it against Kasparov at the Frankfurt Giants Rapids and got snuffed out without a modicum of counterplay.

[Kasparov invited a transposition into the Sicilian Defence. Morozevich declined and was soundly trounced. 1...c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4 Nf6 5.Nf3 d5 6.Bg5 Qa5 7.0-0-0 Be6 8.Bd2 g6 9.e4 d4 10.e5 Ng4 11.Nxd4 Nxd4 12.h3 Bg7 13.hxg4 Bxe5 14.a3 Rc8 15.Bd3 Nb3+ 16.cxb3 Bxc3 17.Bxc3 Rxc3+ 18.Kb1 Rxb3 19.Qh2 Qc3 20.Qb8+ Bc8 21.Rd2 0-0 22.Qh2 h5 23.Rhd1 Bxg4 24.f3 Be6 25.g4 hxg4 26.fxg4 Bxg4 27.Rg1 Rxb2+ 28.Rxb2 Qxd3+ 29.Qc2 Qd7 30.Qd2 Qxd2 31.Rxd2 Bf3 32.Kb2 Bc6 33.Kc3 Kg7 34.Kb4 e5 35.a4 a6 36.a5 e4 37.Kc5 Re8 38.Re1 Re6 39.Kd4 f5 40.Rh2 Kf6 41.Rh8 Rd6+ 42.Kc5 Rd5+ 43.Kb6 Rb5+ 44.Kc7 Rxa5 0-1 Morozevich,A-Kasparov,G/Frankfurt 2000 (44)]

[2.Nf3 Nc6 3.d4!?]

2...Nc6 Maybe a Vienna?

3.a3?! Try as I did, I couldn't find a good reason for White to lose a tempi except perhaps a fetish for the Black side of the Scotch Four Knights Defence. 1.a3 to confuse your opponent is more to the point... as super GM Peter Leko demonstrated.

[1.a3 e5 2.c4 Nf6 3.Nc3 d5 4.cxd5 Nxd5 5.Nf3 Nc6 6.Qc2 Well, a Reversed Sicilian Taimanov with a3 thrown in gives White a good game. Be6 7.e3 a6 8.b4 Nxc3 9.dxc3 Qf6 10.e4 This is a good Reversed Philidor's Defence position for White. The manner which Leko transforms his slight edge into massive proportions is admirable. 10...h6 11.Be2 Be7 12.0-0 0-0 13.a4 Rfd8 14.Be3 Qg6 15.Rfd1 Bh3 16.g3 Qe6 17.Nd2 Qf6 18.Nb3 b6 19.a5 Rxd1+ 20.Qxd1 Rd8 21.Qc2 b5 22.Rd1 Be6 23.Nc5 Rxd1+ 24.Qxd1 Bxc5 25.Bxc5 Nd8 26.f3 Nb7 27.Bf2 Nd6 28.Kg2 h5 29.h4 Kh7 30.Qc1 Bc4 31.Bd1 Nb7 32.Bc2 c5 33.Qd1 Qe7 34.Qd2 cxb4 35.cxb4 Kg8 36.Bb6 Kh7 37.Bd1 Qf8 38.f4 exf4 39.gxf4 Qe7 40.Bf3 Qxh4 41.e5 Qe7 42.Bxh5 Kg8 43.Bf3 Be6 44.Qd3 Bc8 1-0 Leko,P-Santos,M/ICCF Email 1997 (44)]

Now that Bb4 is not possible. 5.exd5 Nxd5 6.Bb5 Nxc3 7.bxc3 Bd6 8.0-0 0-0 9.d4 exd4 10.cxd4 Bg4

[11.Be3!? In the Scotch Four Knights, 11.Nb5 is considered strong but 11...Nb4 is not possible here, thanks to a2-a3. Perhaps White should have gone for this variation instead. 11...Qf6 (11...Ne7 12.h3 Bh5 13.Bd3 Nd5 14.Bd2=) 12.Be2 h6 =+]

A prelude to the exchange of White's most active minor piece. [14.Be3; 14.Re1]

3.a3?! is proving to be a weakness which needs attention either from the Ra1 or Bc1. Black already has the edge.

In the Scotch Four Knights, White often plays a2-a3 and b2-b4 without provocation. Now Black gets in the pawn advances with tempi.

I'm not really sure where is the best square for the Queen Rook and decide to see what White does. It helps that 22.a4 is met by b5-b4, aided by the Rb8.

22.Nd2 allowing Black to trade pieces via a small tactic. 22...Re2 23.Qd3 Rxd2 24.Qxd2 Nb3 25.Qb2 Nxa1 26.Qxa1 Qc6

[A better try is 27.c4! a pawn sacrifice which frees up White's pieces 27...bxc4 28.Bxg7 Bxa3 29.Be5 Re8 30.Bh8 (30.Qxa3 Rxe5 31.Rd8+ Kh7 32.Qf8 Re1+ 33.Kh2 Qf6-+) 30...Bf8 31.Bc3]

Stopping c4 for good.

[28.c4 bxc4 29.Bxg7 Bxa3 30.Bh8 f6 31.Qxa3 Kxh8 32.Qe7 c3 33.Qf7 f5-+]

Black wants to maneuver his heavy pieces to a4 and c4 so he needs to make sure that his back rank is secure. White is in a positional zugzwang anyway as his Rook is needed to guard the sick a-pawn. [29...Qa4 30.Ra1 Rc4 31.Qe2 with counterplay]

A winning endgame thanks to the extra b pawn. Had it been an a pawn instead, White's drawing chances would have been tremendous.

Allowing Black to reroute his Rook to its ideal square.

Now it's all over as White's King is tied down to guarding the b-pawn.