Johann Sloboda (1807) - Spanton (1937)
Colle-Zukertort
1.d4 d5 2.Nf3 e6 3.e3 c5 4.b3 Nc6 5.Bd3!?
Normal is 5.Bb2, but the text has also been played by grandmasters.
5...cxd4!?
Trying to take advantage of White's move-order by fixing a pawn on d4.
6.exd4 Nf6 7.Nbd2!? Nb4!? 8.Be2
The engines are happy with the text, but also suggest 8.Bb5+ Bd7 9.Be2!?, which is reminiscent of a popular manoeuvre by Black against the Catalan, ie 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.g3 Bb4+ 5.Bd2 Be7!?
8...Qc7 9.c4 dxc4!? 10.bxc4 b5?
A simple, but bad, oversight.
11.a3 bxc4?
After 11...Nc6 12.cxb5 White is winning, according to Stockfish17 and Dragon1, but a lot of moves will have to be played before the extra pawn proves decisive.
12.axb4
 |
| How big is White's advantage? |
*****
*****
*****
*****
White is not only up knight for pawn (Black cannot play 12...Bxb4?? as that loses the bishop to 13.Qa4+ and 14.Qxb4), but also leads in development. The engines reckon White's advantage is worth more than a minor piece.
12...c3 13.Nc4 Bd7 14.Nce5!? Bxb4 15.Qc2 0-0 16.Nxd7 Qxd7 17.Ba3 Rab8?
The c pawn is Black's only trump in the position. It is not much, but it is something - or, rather, was something - so 17...a5 should have been played.
18.Bxb4 Rxb4 19.Qxc3 Nd5 20.Qa3 Rfb8 21.0-0
Not 21.Qxa7?? Qxa7 22.Rxa7 Rb1+ 23.Bd1 Nc3 24.Kd2 Ne4+ 25.Ke3 Nc3 26.Kd2 Ne4+ etc.
21...Rb2 22.Rfe1 Nf4 23.Bf1 R8b7 24.Ra2 R2b3 25.Qa4 Qd8 26.Rc2 g5!?
Desperation, but there is nothing in 26...Rxf3!? 27.gxf3 Qg5+ 28.Kh1 h5, eg 29.Rc8+ Kh7 30.Qc2+ f5 31.d5!? Nxd5 32.Rxe6 h4 33.Rf8.
27.Rec1 Qd5?! 28.Qe8+ Kg7 29.Rc5
The engines flash red at this move as White has stronger continuations, but the text is plenty good enough.
29...Qe4 30.Rxg5+ Ng6
Not 30...Kf6? 31.Re7 Qh8#.
31.Qc6 Qf4 32.Rg3 R7b6 33.Qc5 Kh8!? 34.Kh8 Qd6 1-0
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