NEW UPDATED OPENING LINE
[December 05, 2018] Updated Opening Line by Bojan Vučković:
Nimzo-Indian Defense, Steiner, Spielmann, Saemisch & Leningrad Variations
[Line 173 : 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 without 4. e3, 4. Qc2, 4. Nf3, 4. f3]
The most frequent choices of White are dealt with in the separate opening lines: 4. e3 in Lines 186-194, 4. Qc2 in Lines 175-185, 4. f3 in Line 174, and 4. Nf3 in Lines 198-199.
Black has a couple of ways to get promising positions in the Leningrad Variation (4. Bg5) and 4… c5 is the most principal option.
Saemisch Variation (4. a3) forces Black to concede the pair of Bishops 4… Bxc3+ 5. bxc3, but White’s pawn structure gets weakened in return.
Spielmann Variation (4. Qb3) is rarely seen nowadays since Black equalizes comfortably, and 4… c5 seams like the easiest way to do it.
If White opts for Steiner System (4. g3), the game transposes to Line 170 after 4… O-O 5. Bg2 d5, where again Black should not have problems to get even chances.
[Diagram: White to Move] S. Mamedyarov – N. Grandelius, Rogaska Slatina 2011. Apart from the anticipated 8. c4xd5 White has a much stronger reply, leading to a big advantage. So, what is the best move for White in the diagrammed position?
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