His score of +4=4-0, plus a default win in round eight, saw him triumph on tiebreak, despite losing 6.7 Fide elo.
Two of his wins came on the white side of a French Defence, but in round one he won in the same opening with black.
Klaus-Michael Hansch (1900) - Dieter Pirrot (2313)
French
1.e4 e6 2.b3!?
It is interesting that many books have been written on how to meet Anti-Sicilians, but there does not seem to be the same market for books on Anti-Frenchs. This particular anti-French has been tried by Magnus Carlsen, albeit in blitz tournaments.
2...d5 3.Bb2 Nc6!?
The mainline in ChessBase's 2024 Mega database runs 3...dxe4 4.Nc3 Nf6 5.Qe2 Be7 6.0-0-0 0-0, with an imbalanced position that Stockfish16 and Komodo14.1 reckon gives equal chances.
4.exd5!? exd5 5.Bb5!? Ne7!?
There is just one example of this move in Mega24, but it is the top choice of the engines.
6.Qe2 Be6 7.Nf3 a6 8.Bxc6+ Nxc6 9.0-0
 |
| How should Black proceed? |
*****
*****
*****
*****
9...d4
The engines give 9...Bd6!?, the idea being that after 10.Bxg7 Rg8 11.Bb2 Black can quickly castle queenside with an imbalanced position that probably favours the bishop-pair.
10.d3 Be7 11.Nbd2 Qd5 12.a3 0-0-0
 |
| Now both sides have castled, how would you assess the position? |
*****
*****
*****
*****
Black has more space and the bishops. The engines give Black the upper hand.
13.Rfe1 Rhe8
Both players seem to feel the centre is not closed enough for purely flank action.
14.Qe4
 |
| What should Black play? |
*****
*****
*****
*****
14...Qh5!?
An exchange of queens would probably make White's defence easier, so Pirrot offers a pawn, relying on his bishop-pair and lead in development to give attacking chances. The engines prefer 14...Qc5!?, reckoning 15.b4!? Qxc2!? strongly favours Black.
15.Qe2!?
Going into defensive mode may be wrong, but 15.Nxd4!? is hairy, eg 15...Nxd4 16.Bxd4 Bd6 17.g3 Bxb3!? 18.Qxe8 (more-or-less forced) Rxe8 19.Rxe8+ Kd7 20.Re3 Bxc2 21.Bxg7!? Qg6 22.Bb2 Bxd3 is unclear (completely equal, according to Komodo14.1; the upper hand for White, according to Stockfish16).
15...Bd6 16.Qf1?!
But this is probably a passive step too far. The engines give 16.Ne4 Bg4 17.h3, when 17... Bxf3 18.Qxf3 Qxf3 18.gxf3 may be just about holdable. However, stronger for Black may be 17...Bxh3!? 18.gxh3 Qxh3. After the further 19.Nxd6+ cxd6 20.Ng5!? Qh4 21.Qd2, White has bishop for two pawns, but the white king is in great peril.
16...Bf4!?
The engines agree this is best. Among the points in its favour is that d4 is now firmly protected, the white king's knight is tied to its queenside colleague and the bishop interferes with white along play White's fourth rank.
17.Re4 g5 18.Rae1 Rg8 19.g3 Bd5 20.Rxf4!?
The engines suggest 20.gxf4 or 20.Qe2, but give Black a large advantage, eg 20.gxf4 gxf4+ 21.Kh1 f5! 22.Rxf4 Rdf8 with ...Qh6 to come.
20...gxf4 21.Nxd4 Ne5 22.Ne4 Ng4 23.Nf3?!
This does not help, but 23.h3 Ne5 is also horrible, eg 24.Qg2 Rg6 25.Bc1 fxg3 26.Nxg3 Bxg2 27.Nxh5 Bxh3+ 28.Kh2 Ng4+ 29.Kxh3 Nxf2+ 30.Kh2 Rdg8 wins for Black.
23...f5 24.Ned2 Nxh2! 25.Nxh2 fxg3 0-1
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