QGD Semi-Tarrasch
1.d4 e6 2.c4 Nf6 3.Nf3 d5 4.Nc3 c5 5.cxd5 cxd4!?
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| Much more popular in ChessBase's 2026 Mega database are 5...exd5 and especially 5...Nxd5, but the text is, by a small margin, the top choice of Stockfish17.1 and Dragon1 |
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6.Qa4+!?
The main line in Mega26 runs 6.Qxd4 exd5 7.Bg5 Be7 8.e3 0-0 9.Be2 Nc6 10.Qd3 h6 11.Bh4 Qb6 12.0-0!?, with equal chances, according to the engines.
6...Bd7 7.Qxd4
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| The point of White's queen manoeuvre is that the bishop at d7 interferes with Black's fight for the d5 square |
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7...exd5 8.Nxd5
More common, but scoring 11 percentage points less in Mega26, is declining the pawn with 8.Bg5!?
8...Qa5+ 9.Nc3 Nc6 10.Qd1
This is most popular, but the engines also like a move not in Mega26, 10.Qd3!?, eg 10...0-0-0 11.Bd2 Bg4 12.Qb5!? Qxb5 13.Nxb5 Ne4!?, when they reckon Black has enough for a pawn, but no more. However, note that 10.Qd2?!, also apparently a novelty, is problematic for White after both 10...0-0-0 and 10...Bb4.
10...Ne4 11.Bd2
If 11.Qd5, Black has 11...Qxd5!? 12.Nxd5, and then the engines suggest an apparent-novelty in 12...Nb4!?, after which 13.Nxb4 Bxb4+ 14.Bd2 (not 14.Nd2? Rc8!) Nxd2 15.Nxd2 0-0 gives Black good compensation for a pawn, according to the engines.
11...Nxd2 12.Qxd2 Bb4!?
This may be a novelty. Harry Golombek - Stuart Milner-Barry, British Championship (Brighton) 1938, went 12...0-0-0 13.Nd5? Qxd5?? (13...Nb4! wins) 14.Qxd5 Bb4 15.Nd2 Be6 16.Qxd8+?! (16.Qg5!? is preferred by the engines) Rxd8 17.0-0-0 (1-0, 31 moves). Best after 12...0-0-0 may be the surprising retreat 13.Qc1!?, when Cliff Wichman (2319) - Konstantin Cebulla (2054), Staufer Open (Schwäbisch Gmünd) 2017, continued 13...Bf5 14.a3, with what the engines reckon may be a slight edge for White.
13.e4?!
The engines prefer 13.Rc1 or 13.e3, claiming a slight edge for White.
13...0-0-0 14.Bd3?!
It is hard to come up with an acceptable suggestion, the engines fluctuating between several moves, but possibly best is 14.Qc2, although 14...Bg4 15.Be2 Bxf3!? 16.Bxf3 Nd4 gives Black the upper hand, according to the engines.
14...Bg4 15.0-0?
The engines give 15.Rd1 or 15.0-0-0, but agree Black is well on top.
15...Bxf3 16.gxf3 Ne5
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| White is losing a piece |
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17.Qc2 Bxc3 18.Rfd1 Rxd3 19.Rxd3 Nxd3 20.Qxd3 Qg5+ 21.Kf1 Be5 22.Qd5 Rd8 23.Qc5+ Kb8 24.Rc1 Qf4 25.Kg2?
White is lost anyway, but this makes matters much worse.
25...Qxh2+ 26.Kf1 Bd4 27.Qc2 Bb6 28.b4 Qh1+ 29.Ke2 Qg2 30.Rf1 Qg5 31.a4 a5!? 32.b5 Qc5 33.Qb2 Qd4 34.Qc2 Rc8 35.Qa2 Qc4+ 36.Qxc4 Rxc4 37.Ra1 Rc2+ 38.Ke1 Rxf2 39.Ra3 h5 0-1
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