Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4/3. c3/3...dxc3/4. Bc4

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Danish Gambit, Collijen Defense
a b c d e f g h
8 a8 b8 c8 d8 e8 f8 g8 h8 8
7 a7 b7 c7 d7 e7 f7 g7 h7 7
6 a6 b6 c6 d6 e6 f6 g6 h6 6
5 a5 b5 c5 d5 e5 f5 g5 h5 5
4 a4 b4 c4 d4 e4 f4 g4 h4 4
3 a3 b3 c3 d3 e3 f3 g3 h3 3
2 a2 b2 c2 d2 e2 f2 g2 h2 2
1 a1 b1 c1 d1 e1 f1 g1 h1 1
a b c d e f g h
Position in Forsyth-Edwards Notation(FEN)

rnbqkbnr/pppp1ppp/8/8/2B1P3/2p5/PP3PPP/RNBQK1NR

Collijen Defense[edit]

4. Bc4[edit]

4. Bc4 gambits a second pawn. It develops the light-squared bishop to a place attacking blacks weakest square (F7)

This position often leads to the Danish Gambit after cxb2. Black almost always takes the pawn although he could play knight to c6 or f6 transposing into the Goring Gambit if white captures the pawn with his knight.

In one rare line, black advances his pawn to c2, not wanting to let white develop his dark squared bishop onto the long diagonal.

Theory table[edit]

1. e4 e5 2. d4 exd4 3. c3 dxc3 4. Bc4

4 5 6
Bc4
cxb2
Bxb2
d5
Bxd5
Nf6
=
...
Nc6
Nf3
cxb2
Bxb2
Nf6

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References[edit]