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Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...Nd4/4. Nxd4

Bird's defence
a
b
c
d
e
f
g
h
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
a
b
c
d
e
f
g
h

Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4
ECO code: C61
Parent: Bird's defence

4. Nxd4

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White takes the offered trade. This is the main continuation.

After 4...exd4, Black will have gained some space and the pawn on d4, which is not so easy for White to dislodge.

Theory table

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1. e4 e5 2. Nf3 Nc6 3. Bb5 Nd4 4. Nxd4

4 5 6 7 8 9
Bird's defence ...
exd4
O-O
Bc5
d3
c6
Ba4
Ne7
f4
f5
Bb3
d5
...
...
...
...
...
...
Bc4
d5
exd5
cxd5
Bb5+
Bd7
=
...
...
...
c6
Bc4
Nf6
Re1
d6
...
...
...
a5
d3??
c6
Bc4
b5
Paulsen variation ...
...
...
Ne7

References

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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: