QGD Chigorin
1.d4 d5 2.c4 Nc6 3.Nf3 Bg4 4.e3 e5!?
The engines prefer the more-conservative 4...e6.
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| How should White proceed? |
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5.exd5
5.exd5
The engines prefer 5.Qb3!?, continuing 5...Bxf3 6.gxf3 dxc4 7.Bxc4 Qd7 8.dxe5 Na5, when both 9.Bxf7+ and 9.e6 seem to give White an edge.
A major alternative is 5.cxd5 Qxd5 6.Nc3 Bb4, when the engines like 7.Be2!? exd4 8.0-0!? Bxc3 9.bxc3 d3!? with maybe a slight edge for White. If 7.Bd2, the engines give 7...Bxc3 8.bxc3 e4 9.c4 Qd6 10.h3 Qh6 11.hxg4 Qxh1 12.Ng5, when the bishop-pair gives White a lot of compensation for being the exchange down.
5...dxc4 6.Qxd8+ Rxd8 7.Bd2?!
7.Bxc4 Nxe5! 8.Be2 (8.Nxe5?? Rd1#) may give Black a tiny edge after both 7...Nxf3+ and 7...Nd3+, but is surely preferable to surrendering a pawn, which is what the text does.
7...Bxf3 8.gxf3 Nxe5 9.Be2
The engines give 9.Ke2!?, albeit preferring Black. Also interesting is 9.f4!? Nd3+ 10.Ke2, the point being that after 10...Nxb2 (the engines reckon 10...h5 is best) White gets a strong initiative with 11.Bg2 c6 12.Ba5 Rd7 13.Nd2, when White has full compensation for being two pawns down, according to the engines.
9...Nd3+ 10.Bxd3 cxd3 11.Nc3 c6 12.0-0-0 Nf6 13.a3?!
This seems rather slow. The engines give 13.e4, but much prefer Black.
13...Be7 14.Rhg1 0-0!?
This is not really castling into it, despite possible appearances.
15.e4 Rfe8 16.Be3 b6 17.Rd2 Rd7 18.Rgd1 Red8
The d pawn's position may look precarious, but there seems no way for White to capture it.
19.Rg1 c5 20.Bf4 c4 21.Re1 h6 22.Rh1 Kg7 23.Nb5 a6 24.Nc3 b5 25.Re1
White's play over the last few moves has seem fairly aimless, but it was not easy to come up with a constructive plan other than to wait and hope an opportunity arises when Black tries to make the extra pawn count.
25...Rb7 26.Be5 Nh5 27.Nd5
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| How should Black proceed? |
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27...Rxd5!?
Black retains a large advantage after this exchange sacrifice, but the engines reckon Black's advantage is even bigger after a more-patient move such as 27...f6.
28.exd5 Bg5!?
The engines prefer 28...Rd7 29.d6 Bxd6 30.Bxd6 Rxd6.
29.d6
Not 29.f4? Nxf4.
29...Bxd2+
Even better seems to be the engines' 29...f6 30.Bd4 Rd7 31.Bc5 Kg6.
30.Kxd2 Rd7 31.h3
This gives the bishop a square from which it can guard the d6 pawn.
31...g6?
Slow. Better is 31...Nf6, when 32.Bxf6 gxf6 33.Re7 Rxd6 34.Rxf7+ Kg6 is an easily winning rook-and-pawn ending for Black, according to the engines.
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| White to play and get an advantage |
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32.Bh2
The engines point out 32.b3! cxb3 33.Kxd3, eg 33...f6 34.Bh2 a5 35.Kd4 (not 35.Re7+? Rxe7 36.dxe7 Ng7) Ng7 36.Kc5 with a large advantage for White. Black could try 32...Kg8, but then 33.bxc4 bxc4 34.Rc1 seems good for White.
Note that 31...Nf6, the reply 32.b3 is nowhere near as strong as in the game as 32...cxb3 33.Kxd3 Ne8 is very good for Black.
32...f5?!
Probably better is 32...Ng7, with ...Nf5 to come.
33.Re7+?
Black has at best a slight advantage after 33.b3! Kg7 34.bxc4 bxc4 35.Be5+, according to the engines. The text accedes to a very bad minor-piece ending.
33...Rxe7 34.dxe7 Nf6 35.Be5 Ne8 36.K33 Kg8 37.Bc3 Kf7 38.Bb4 Nc7 39.Kd4 Ne6+ 40.Ke5 a5 41.e8=Q+
Equally hopeless is 41.Bxa5 Kxe7.
41...Kxe8 42.Bxa5 Nc5 43.Kf4 Nb3 44.Ke3 0-1
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