[Site "C18"] [White "French", "Winawer, Classical Variation "]

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Winawer Variation 3...Bb4

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3
If u play the example line, u may face mainly 4 main line at high level chess. I provide diagram for u the chosen line by me against winawer variation.
This variation, named after Szymon Winawer and pioneered by Nimzowitsch and Botvinnik, is one of the main systems in the French, due chiefly to the latter's efforts in the 1940s, becoming the most often seen rejoinder to 3.Nc3, though in the 1980s, the Classical Variation with 3....Nf6 began a revival, and has since become more popular

[Site "C17"] [White "French"] [Black "Winawer, Advance, 5.a3"] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3
[Site "C19"] [White "French"] [Black "Winawer, Advance, poisoned pawn Variation "] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Ne7 7. Qg4
[Site "C18"] [White "French"] [Black "Winawer, Classical Variation "] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7
[Site "C18"] [White "French"] [Black "Winawer, Classical Variation "] 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6.bxc3 Qa5 7.Bd2 Qa4 8.Qg4

Most of all explanation u can see at Wikipedia. I just copy the sub line which has connected with my 1.e4 preparation only. There a lot lines, some of them just have 2 or 3 games. This line also can transpose to the other line. Some of them, the evaluation really favor to white. I just compile some popular line u may face in the tournament.

3...Bb4 pins the knight on c3, forcing White to resolve the central tension. White normally clarifies the central situation for the moment with 4.e5, gaining space and hoping to show that Black's b4-bishop is misplaced. Black can play 4....Ne7, though he usually responds 4...c5, after which the usual reply is 5.a3 Bxc3+ 6.bxc3, resulting in the position below:While White has doubled pawns on the queenside, which form the basis for Black's counterplay, they can also help White since they strengthen his centre and give him a semi-open b-file. White has a spatial advantage on the kingside, where Black is even weaker than usual because he has traded off his dark-squared bishop. Combined with the bishop pair, this gives White attacking chances, which he must attempt to utilise as the long-term features of this pawn structure favour Black.

Black most frequently plays 6...Ne7. (The main alternative is 6...Qc7, which can simply transpose to main lines after 7.Qg4 Ne7, but Black also has the option of 7.Qg4 f5 or....f6.) Now White can exploit the absence of Black's dark-square bishop by playing 7.Qg4, giving Black two choices: he may sacrifice his kingside pawns with 7...Qc7 8.Qxg7 Rg8 9.Qxh7 cxd4 but destroy White's centre in return, the so-called "Poisoned Pawn Variation"; or he can play 7...0-0 8.Bd3 Nbc6, which avoids giving up material, but leaves the king on the flank where White is trying to attack. Experts on the 7.Qg4 line include Judit Polgár.