Line 343 is an introductory line of the Winawer Variation of the French Defense and, as can be expected, White has many, substantially different, possibilities at his disposal.
Exchange variation (4. exd5) typically leads to quiet positions. After 4… exd5 5. Bd3 a common continuation could be 5… Nc6 6. a3 Bxc3+ 7. bxc3 Nge7 with White having a pair of Bishops and his opponent relying on a better pawn structure.
Old move 4. Nge2 doesn’t seem to pose real problems to Black. After 4… dxe4 5. a3 Be7 6. Nxe4 Nf6 occurs a position similar to the Rubinshtein Variation (3… dxe4 4. Nxe4), but the Knight on e2 is here a bit passive.
By choosing 4. a3 White is heading for sharp lines 4… Bxc3+ 5. bxc3 dxe4 6. Qg4 Nf6 7. Qg7 Rg8 8. Qh6, where Black has a few ways to get sufficient counterplay.
By far the main move is 4. e5 and the main option 4… c5 is covered in our Lines 344-346. Other popular variations for Black are 4… b6 and 4… Qd7, while 4… Ne7 usually transposes to positions from 4… c5, for example 4… Ne7 5. a3 Bxc3+ 6. bxc3 c5 is the initial position of Line 345.
[Diagram: White to Move] Black has a Bishop+Queen battery aiming towards the White King, and the g2-pawn is under attack. How can White protect his King and activate the pieces to gain a clear advantage?
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