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Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Bb4/4. e5/4...c5/5. a3

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Winawer variation
a
b
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d
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f
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8
7
6
5
4
3
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1
8
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6
5
4
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Position in Forsyth-Edwards Notation (FEN)
rnbqk1nr/pp3ppp/4p3/2ppP3/1b1P4/P1N5/1PP2PPP/R1BQKBNR
Moves: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3
ECO code: C17-C19
Parent: Winawer variation

5. a3

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This is the main line of the Winawer variation. Black's bishop is pinning White's c3 knight, and their c5 advance has just put additional pressure on White's center. At this point, White has chosen to regain the initiative by kicking out the bishop with 5. a3.

Black usually takes the knight with 5...Bxc3+, because moving 5...Ba5 leaves the c5 pawn undefended and open to White's 6. dxc5.

Theory table

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For explanation of theory tables, see theory table and for notation, see algebraic notation.

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3

5 6 7
Main line ...
Bxc3+		 bxc3
Ne7		 ⩲
Retreat variation ...
Ba5		 b4
cxd4		 Nb5
Bc7		 ⩲
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References

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v · t · e
Chess Opening Theory
1. e4 e5
Open games
2. Nf3
2...Nc6
3. Bb5
Spanish
3. Bc4
Italian
3. Nc3
Three knights
Other
2...Nf6
Russian
2...d6
Philidor
Other
2. f4
King's gambit
2...exf4
Accepted
Other
Declined
2. Nc3
Vienna
Other
1. e4 c5
Sicilian
2. Nf3
2...Nc6 3. d4 cxd4 4. Nxd4
2...Nc6 other
2...d6 3. d4 cxd4 4. Nxd4
2...d6 other
2...e6 3. d4 cxd4 4. Nxd4
2...e6 other
Others
Anti-Sicilians
1. e4 e6
French
1. e4 c6
Caro-Kann
1. e4 other
1. d4 d5
Closed games
2. c4
Queen's gambit
2. Nc3
2. other
1. d4 Nf6
Indian
2. c4 e6
2. c4 g6
2. c4 other
2. Nf3
2. other:
1. d4 f5
Dutch
1. d4 ...other:
1. Nf3
Zukertort
Flank
Unorthodox
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