Four Knights Game: Spanish Variation, Rubinstein Variation
The Rubinstein Variation is 4...Nd4 in the Spanish Four Knights, moving the knight again to hit the b5-bishop and offering the e5 pawn. White chooses between the safe 5.Nxd4, a bishop retreat, or grabbing e5, while Black wants fast development.
- Moves
- 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4
- ECO
- C48
- Engine
- +0.07 · level (Stockfish 17.1, depth 20)
- Played
- 654 games in our lichess sample
- White scores
- 51.8%
Key ideas for both sides
White
- 5.Nxd4 exd4 6.e5 dxc3 7.exf6 Qxf6 8.dxc3 is the main forcing line: White gets doubled c-pawns but an open d-file and easy development.
- 5.Bc4 keeps pieces on. After 5...c6 6.Nxe5 d5, Black gives a pawn to gain time against the bishop.
- Grabbing with Nxe5 invites ...Qe7, hitting the knight, and f4 is needed to hold it.
Black
- After 5.Nxd4 exd4 6.e5, 6...dxc3 7.exf6 Qxf6 wins the piece back, and ...Bc5 and quick castling follow.
- Against 5.Bc4, play 5...c6 and ...d5, using the pawns to gain time on the bishop even at the cost of e5.
- If White takes on e5 with the knight, ...Qe7 hits it; when it moves, ...Nxe4 or ...Nxb5 can follow.
Plans and pawn structure
The d4-knight is Black's key piece: from d4 it hits b5, c2, e2 and f3 and can trade off White's best minor piece. In the 5.Nxd4 line, White ends up with doubled c-pawns and an open d-file, and both sides race to castle. White's plan is Bd3, O-O and Re1 with play on the e-file. Black answers with ...Bc5, ...O-O and ...d6, with the queen on f6 eyeing f2.
What the engine plays from here
Stockfish 17.1 at depth 20 rates the position +0.07: level. Its three top choices for White:
- +0.07 5.Nxd4 exd4 6.e5 dxc3 7.exf6 Qxf6
- 0.00 5.Bc4 c6 6.Nxe5 d5 7.exd5 Bd6
- −0.02 5.O-O c6 6.Bd3 Nxf3+ 7.Qxf3 Bd6
Pawns, from White's side.
How it scores on lichess
654 rated lichess games reached this position; White scored 51.8%.
Light: White wins. Grey: draws. Dark: Black wins. About the sample.
Where it goes next
- Spanish Variation, Rubinstein Variation Accepted5.Nxd4 · rare
- Spanish Variation, Rubinstein Variation, Marshall Gambit5.Ba4 · rare
- Spanish Variation, Rubinstein Variation, Marshall Variation5.Nxe5 · rare
- Spanish Variation, Rubinstein Variation, Maróczy Variation5.Be2 · rare
How to play against it
5.Nxd4 is the clearest: after the forced trades the position is open and level, and simple development is enough. If you grab with Nxe5, be ready for ...Qe7 and f4. Don't retreat into passive setups that let the d4-knight stay there forever.
Other lines with this name
The lichess opening list also files these lines under the same name, though they reach a different position: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4 5.Be2; 1.e4 e5 2.Nf3 Nf6 3.Nc3 Nc6 4.Bb5 Nd4 5.Nxe5 Qe7 6.f4.
Questions
What are the moves of the Four Knights Game: Spanish Variation, Rubinstein Variation?
The Four Knights Game: Spanish Variation, Rubinstein Variation starts 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4. Its ECO code is C48.
Is the Four Knights Game: Spanish Variation, Rubinstein Variation good for Black?
Stockfish 17.1 rates the position +0.07 at depth 20, which is level. In 654 lichess games from our sample, White scored 51.8%. Black's most active answer to the Spanish Four Knights, good for players who like early tactics and know the main trades.
What is the main idea of the Four Knights Game: Spanish Variation, Rubinstein Variation?
Black answers the Spanish bishop with a counterattack, putting a knight on d4 and inviting White to take on e5. The key lines are 5.Nxd4 with forcing trades, or grabbing e5 and facing ...Qe7.
What should White play next?
The engine's first choice is Nxd4, with Bc4 and O-O close behind. 5.Nxd4 removes the strong knight at once, and after the forced trades White develops freely.
Related lines
Updated October 2026. Sources and method.