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Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Bb4/4. e5/4...c5/5. a3/5...Bxc3/6. bxc3/6...Ne7/7. Qg4/7...O-O/8. Nf3/8...Nbc6/9. Bd3/9...f5

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French Defence, Winawer Variation
a b c d e f g h
8a8 black rookb8 black kingc8 black bishopd8 black queene8 black kingf8 black rookg8 black kingh8 black king8
7a7 black pawnb7 black pawnc7 black kingd7 black kinge7 black knightf7 black kingg7 black pawnh7 black pawn7
6a6 black kingb6 black kingc6 black knightd6 black kinge6 black pawnf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black kingc5 black pawnd5 black pawne5 white pawnf5 black pawng5 black kingh5 black king5
4a4 black kingb4 black kingc4 black kingd4 white pawne4 black kingf4 black kingg4 white queenh4 black king4
3a3 white pawnb3 black kingc3 white pawnd3 white bishope3 black kingf3 white knightg3 black kingh3 black king3
2a2 black kingb2 black kingc2 white pawnd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 black kingc1 white bishopd1 black kinge1 white kingf1 black kingg1 black kingh1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)

r1bq1rk1/pp2n1pp/2n1p3/2ppPp2/3P2Q1/P1PB1N2/2P2PPP/R1B1K2R w

Moves: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3 6. bxc3 Ne7 7. Qg4 O-O 8. Nf3 Nbc6 9. Bd3 f5

French Defence, Winawer Variation

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Black's last move 9... f5 stopped White's threat of sacrificing the bishop on h7.
If White doesn't capture Black's f5 pawn en passant now, then their king bishop's diagonal (b1-h7) will be blocked permanently.
Because having their king bishop on a blocked diagonal certainly won't help White's kingside attack at all, White usually decides to capture the f5 pawn en passant 10. exf6.
However, in a few games White also played 10. Qh3 - in hope for opening a file on the kingside for their rooks at a later time.

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 Bxc3+ 6. bxc3 Ne7 7. Qg4 O-O 8. Nf3 Nbc6 9. Bd3 f5

10
Main Continuation exf6
Rxf6		 =
Rare Continuation Qh3
...		 =

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References

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Wikipedia has related information at French Defence

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