The Strategic Idea
After 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4, if Black plays 4…Nf6, White responds with 5.Nc3.
Both sides have both knights out. That’s the Four Knights setup.
The nice thing about this for White: you skip all the heavy theory in the classical Scotch lines (which come after 4…Bc5). You just develop and play chess.
White’s plan is the same in every variation: develop the bishops, castle short, control the center.
Handling the pin with 5…Bb4
The most annoying response is 5…Bb4, pinning the knight on c3. Don’t panic — this is easy to handle.
White plays 6.Nxc6 bxc6 — trading the knight and doubling Black’s c-pawns. Then develop with 7.Bd3 and fight for the center. The doubled pawns are a real weakness Black has to deal with all game.
Who Plays the Scotch Four Knights: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3?
Garry Kasparov revived the Scotch Game in the 1990s after detailed computer-assisted preparation, shocking his opponents with it at the highest level.
Magnus Carlsen uses the Scotch as a practical weapon, appreciating its unbalanced positions where long-term skill matters more than pure memory.
Wesley So and Fabiano Caruana have both employed Scotch-related systems with modern refinements.
The Scotch Four Knights: 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 was popular in the 19th century but fell out of fashion in the 20th as the Ruy Lopez dominated. Kasparov’s revival demonstrated that old systems can be reborn with modern analysis.
Main Variations
Main Line: 5...Bb4 6.Nxc6 bxc6 7.Bd3
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.Nxc6 bxc6 7.Bd3 d5 8.exd5 cxd5
Black pins the Nc3. White trades on c6 to double Black's pawns, then develops with Bd3. After ...d5 White accepts an open game with active piece play.
5...Nxd4 6.Qxd4 c5 7.Qd3
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 Nxd4 6.Qxd4 c5 7.Qd3 Be7 8.Be2
Black simplifies by trading on d4, then plays ...c5 to gain space. White retreats the queen and gets a slight positional edge with the better knight.
5...d6 6.Be2 Be7 7.O-O
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 d6 6.Be2 Be7 7.O-O O-O 8.Nxc6 bxc6
A solid, quiet line. Both sides develop normally and castle. White can aim for f4 or a slow queenside expansion. The position is balanced but has long-term strategic interest.
Belgrade Gambit: 5...Nxd4 6.Nd5
1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3 Nxd4 6.Nd5 Nb5 7.Nxf6+ Qxf6 8.Qd5
The Belgrade Gambit is a sharp sideline. After Black trades on d4, White plays the aggressive Nd5 instead of recapturing. This leads to wild tactical complications.
Common Mistakes
Mistake 1 — Letting Black equalize with 5…Nxd4 6.Qxd4 c5
When Black plays 5…Nxd4 and follows with …c5, the queen gets kicked and Black gets easy equality if White isn’t careful.
The queen is out of the game on a4. Black develops normally and White has no advantage.
Queen retreats to d3 — still central, still useful. White keeps a slight edge with better knight vs bishop structure.
Mistake 2 — Not following up after Nxc6 bxc6
After doubling Black’s pawns, White needs to press the advantage. Passive play gives Black time to fix the structure.
White isn't pressuring the doubled c-pawns. Black will consolidate with ...Re8 and ...Ba6.
Castle and then put pressure on d5 with Bg5 or Re1. The doubled pawns are a target — keep attacking them.
Mistake 3 — Playing the Belgrade Gambit without knowing it
After 5…Nxd4, if you accidentally play 6.Nd5 without knowing the follow-up, Black just develops normally and you’ve given up a pawn.
Black retreats the knight and pushes ...c6. White has nothing for the sacrificed material.
Just recapture. Develop normally. The Belgrade requires specific preparation — don't play it blind.