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Chess Opening Theory/1. e4/1...a6/2. d4/2...b5/3. c4

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St. George Defence:Three Pawns Attack
a b c d e f g h
8a8 black rookb8 black knightc8 black bishopd8 black queene8 black kingf8 black bishopg8 black knighth8 black rook8
7a7 black kingb7 black kingc7 black pawnd7 black pawne7 black pawnf7 black pawng7 black pawnh7 black pawn7
6a6 black pawnb6 black kingc6 black kingd6 black kinge6 black kingf6 black kingg6 black kingh6 black king6
5a5 black kingb5 black pawnc5 black kingd5 black kinge5 black kingf5 black kingg5 black kingh5 black king5
4a4 black kingb4 black kingc4 white pawnd4 white pawne4 white pawnf4 black kingg4 black kingh4 black king4
3a3 black kingb3 black kingc3 black kingd3 black kinge3 black kingf3 black kingg3 black kingh3 black king3
2a2 white pawnb2 white pawnc2 black kingd2 black kinge2 black kingf2 white pawng2 white pawnh2 white pawn2
1a1 white rookb1 white knightc1 white bishopd1 white queene1 white kingf1 white bishopg1 white knighth1 white rook1
a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 a6 2. d4 b5 3. c4

St. George Defence/Three Pawns Attack

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This variation is the most aggressive White could play. By playing c4, White threatens either to build a very powerful center or to destroy Black's army at the queen side.

Black can react in various ways.

3...Bb7 ignores the threat and strikes at the center. It wouldn't be wise for White to trade a wing pawn against a center pawn. But now, White can defend with Nc3 as b4 would be answered with Qb3 (pinning the pawn).
3...b4 tries to keep the pressure at the queen side, letting White build his center. It's a very sharp variation for Black as White is going to have many weapons to attack both at the center and at the queen side, including moves as Qb3, d5, Nc3 and Bd2.
3...bxc4 isn't very logical, as Black abandons his queen-side power. He will have to fight back at the center despite White advance in development. In this case, it would have been better to play a classical Open Game (1...e5) or Sicilian (1...c5).

Theory table

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

'1.e4 a6 2.d4 b5 3.c4'

3
...
Bb7
=
...
b4
=
...
bxc4
=

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References

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