Four Knights Game: Scotch Variation Accepted, Main Line

1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 O-O 9.O-O

ECO C47

The Four Knights Game: Scotch Variation Accepted, Main Line is a chess opening line in the Four Knights Game complex, reached after 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 O-O 9.O-O.

It is catalogued under code C47 in the Encyclopaedia of Chess Openings (ECO).

The defining move O-O is chosen by White on move 9.

Study this line with a grandmaster

This position is covered in the Scotch Opening course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.