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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...Bc5/4. O-O

Classical defence
a
b
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d
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g
h
8
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5
4
3
2
1
8
7
6
5
4
3
2
1
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h

Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Bc5 4. O-O
ECO code: C64
Parent: Classical defence

4. O-O

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White castles.

4...Nd4 is a common continuation, threatening the Spanish bishop. This is similar to the Bird defence (3...Nd4) but now Black has the option of recapturing with the bishop instead of the pawn: 5. Nxd4 Bxd4. This allows White to get in 6. c3 with tempo, however.

4...Nf6 transposes into the Beverwijk variation of the Berlin defence.

Theory table

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

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References

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See also

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v · t · e
Chess Opening Theory
1. e4 e5
Open game
2. Nf3
With 2...Nc6:
  • Four knights ( )
  • Italian game ( )
  • Spanish game ( )

With other 2nd moves:

2. Other
1. e4 c5
Sicilian defence
1. e4 ...other: