So you want to actually play the Four Knights Game, not just nod along. Perfect — it’s one of the most logical openings to learn, because every move is simply “develop a piece to a good square.” We’ll walk the classical main line move by move, focusing on the Spanish Four Knights (4.Bb5), and then show the other big road, the open Scotch Four Knights (4.d4).
The line we’re learning: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 This is the Spanish Four Knights with the classic …Bxc3 unpin — solid, symmetrical, and instructive.
Step through the line
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The Spanish Four Knights main line — symmetrical development, then Black unpins with ...Bxc3 and ...Qe7.
Move by move
1.e4 e5 — staking the center
Both sides plant a pawn in the middle and free their pieces. Standard open-game opening.
2.Nf3 — develop with a threat
White’s knight jumps out and attacks the e5-pawn right away. Developing with a threat forces Black to respond — exactly what good opening play looks like.
2…Nc6 — defend and develop
Black’s most natural move: the knight guards e5 and develops toward the center. One move, two jobs.
3.Nc3 — develop the second knight
White brings out the other knight, defending e4 and eyeing d5. White is deliberately not committing a bishop yet — keeping options open.
3…Nf6 — Black mirrors
Black develops the kingside knight, attacking e4 and completing the symmetry. Now all four knights are out and we have the Four Knights Game proper.
4.Bb5 — the Spanish pin
White borrows the Ruy Lopez idea, developing the bishop to b5 and pinning the c6-knight against… nothing yet, but it pressures the knight that defends e5. This is the classical main line. (The big alternatives — 4.d4, 4.Bc4, and 4.Nxe5 — get the full tour on the variations page.)
4…Bb4 — Black mirrors again
Black copies White and pins the c3-knight in return. The symmetry is total — and that’s the whole point of the variation. Both sides keep things balanced and sound.
5.O-O O-O — both kings get safe
Castling kingside is the most natural continuation for both. King safety first, then the real game begins.
6.d3 d6 — solid, classical pawn support
Both sides play the modest pawn move that supports the e-pawn and opens a diagonal for the dark-squared bishop. No weaknesses, no commitments — pure classical structure.
7.Bg5 — pin the knight, ask the question
White develops the last minor piece and pins Black’s f6-knight to the queen. This is the moment White finally “breaks symmetry” — Black can’t comfortably copy with …Bg4 here without running into issues, so the games start to diverge.
7…Bxc3 — the classic unpin idea
Black trades the bishop for the c3-knight. Why give up the bishop? Because it removes a defender of e4 and prepares to break the annoying Bg5 pin (the knight on f6 is no longer pinned to a king-and-queen line the same way once Black reorganizes). It’s a well-known equalizing method.
8.bxc3 — recapture toward the center
White takes back with the b-pawn, reinforcing the center (the c3- and d3-pawns form a sturdy chain) and opening the b-file for the rook. The doubled c-pawns are a tiny concession in exchange for the central grip and bishop pair.
8…Qe7 — unpin and prepare …Nd8–e6
The queen steps to e7, breaking the Bg5 pin and preparing the classic regrouping maneuver …Nd8–e6, which kicks the g5-bishop and reroutes the knight to a great square.
The other main road: 4.d4 (the Scotch Four Knights)
If you’d rather skip the slow Spanish symmetry, 4.d4 opens the center immediately, transposing into Scotch-flavored play.
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The Scotch Four Knights — 4.d4 opens the center, and after 6.Nxc6 bxc6 7.Bd3 d5 Black frees the position.
After 4…exd4 5.Nxd4, White has a centralized knight and an open game. A common continuation is 5…Bb4 6.Nxc6 bxc6 7.Bd3 d5, where Black strikes back in the center and reaches a comfortable, balanced position. It’s more dynamic than the Spanish and a good choice if you want piece activity over slow maneuvering.
Notice how different the feel is from the Spanish main line. In the Spanish, the center stays locked and both sides shuffle pieces for a long time; in the Scotch Four Knights, the e-pawns come off immediately, the position opens, and your pieces find active diagonals and files right away. Same opening, two completely different personalities — and you get to choose which one you play simply by your fourth move. That flexibility is one of the Four Knights’ best practical features. For the full tour of every road — Spanish, Scotch, Italian, and the Halloween Gambit — head to the variations guide. New to all this? Start gentle with the Four Knights for beginners.
FAQ
What’s the main line of the Four Knights Game? The Spanish Four Knights: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7, with symmetrical development and the classic …Nd8–e6 regrouping to come.
Why does Black play 7…Bxc3 and give up the bishop? It removes a defender of e4 and, combined with …Qe7, lets Black break the Bg5 pin and reroute the knight via d8–e6. It’s a long-known equalizing method.
Do I have to memorize all eight moves? No — understand the ideas (develop every knight, castle, pin and unpin, reroute the knight to e6) and the moves come naturally. The Four Knights is about principles, not memorized theory.
What if I want a more open game than the Spanish? Play 4.d4, the Scotch Four Knights. It opens the center right away and gives you active piece play — see the variations page.
Keep climbing
Want the reasoning behind moves like “develop with a threat” and “castle early”? Read the opening principles — the Four Knights main line is a textbook example of every one of them. Loop back to the Four Knights overview or the openings hub any time, and compare it with its open-game cousins the Scotch Game and the Italian Game.
Written and fact-checked by the Chess Lab Academy Editorial Team (AI-assisted, human-edited) · Lines checked against mainstream opening theory and verified with Stockfish 17 · ECO C46–C49 · Last verified 2026-06-25 · Sources · How we verify content.