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Chess Opening Theory/1. e4/1...a6/2. d4/2...b5/3. c4/3...Bb7/4. Nc3/4...b4/5. Qb3

St. George Defence:Three Pawns Attack
a
b
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d
e
f
g
h
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
a
b
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h

Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 a6 2. d4 b5 3. c4 Bb7 4. Nc3 b4 5. Qb3

St. George Defence/Three Pawns Attack

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In this position, the pawn cannot take the knight as 6. Qxb7 would be deadly. Two options are offered to black according to the former author, but only one is alright:

5...Ra7 protects the bishop, allowing the pawn to take the knight, but hangs the pawn. Therefore, 5...Ra7 is out.
5...Nc6 is a good move, defending the b pawn and attacking the now undefended d pawn.

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 Bb7 4. Nc3 b4 5. Qb3

5
...
Ra7
=
...
Nc6
=

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References

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v · t · e
Chess openings quick reference
1. e4
2. Nf3
With 2...Nc6:
Four knights: ( )
Italian game: ( )
Spanish game: ( )

With other 2nd moves:
2. Other
1... other
1. d4
Flank
Unorthodox