QGD Semi-Tarrasch
1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Nc3 c5 5.cxd5 cxd4!? 6.Qa4+!?
The mainline in ChessBase's 2022 Mega database runs 6.Qxd4 exd5 7.e4!? Nc6 8.Bb5 dxe4 9.Qxd8+ Kxd8 10.Ng5, reaching a position Stockfish15 and Komodo13.02 reckon favours White.
6...Bd7 7.Qxd4 exd5
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| How should White proceed? |
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8.Bg5
This is the commonest move in Mega22, but grabbing a pawn with 8.Nxd5!? is also possible, although 8...Qa5+ 9.Nc3 Nc6 gives Black decent compensation.
8...Nc6
Black can play 8...Be7!?, when 9.Bxf6!? Bxf6 10.Qxd5 0-0 again gives Black reasonable compensation for a pawn.
9.Qd2 Be6 10.e3 Be7 11.Be2 Ne4!?
This may be a novelty. Normal is 11...0-0.
12.Nxe4 dxe4 13.Bxe7 Qxe7 14.Nd4 0-0-0?
Better is 14...Nxd4 or 14...Bd7, eg 14...Nxd4 15.Qxd4 0-0!? (15...f5 16.Bh5+ Kf8 probably slightly favours White) 16.Qxe4 Qf6 17.Qxb7!? Rab8!? 18.Qxa7 Rxb2 19.Qd4 (only move, according to the engines) Qxd4 20.exd4 Bxa2, when Black has recovered two of the three sacrificed pawns and seems to have enough compensation for the third.
15.Nxc6 bxc6 16.Ba6+ Kb8 17.Qc3 Qc7
The engines' 17...Bc8!? may be better.
18.0-0
Not 18.Qxg7?? Qa5+ etc.
18...f6!? 19.Rfc1
Probably even stronger is 19.Qb4+!?, eg 19...Qb6 20.Qxe4 Bd5 21.Qa4, when White is a pawn up and with much the safer king.
19...Bd5 20.b4 Qb6 21.Be2 Ka8 22.a4 Rb8 23.Rab1
Even better may be 23.b5!? cxb5 24.axb5, when the engines reckon Black has to oppose on the c file, but 24...Rhc8 25.Qxc8!? Rxc8 26.Rxc8+ Kb7 27.Rcc1 is comfortably winning for White, according to the engines.
23...Rhc8 24.a5 Qb7 25.Qd4 a6 26.Rc5 Qa7 27.Qc3
I was worried about 27.Bc4, eg 27...Bxc4 28.Qxc4 leaves Black unable to defend both the c and e pawns. Stockfish15 suggests 27...Bf7!?, when 28.Qe4?? fails to 28...Bg6, but instead White can play 28.h3 to solve back-rank mate problems and remain with a winning position.
27...Qb7 28.Qd4 ½–½
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