UltimaChess
Opening Trainer1. e4 e5

The Four Knights Game

Simple, principled chess.

The Four Knights Game is one of the most principled openings in chess. After 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6, both sides have developed their knights to their natural squares and the position is perfectly balanced. It is an ideal opening for learning how chess is supposed to be played.

Despite its "boring" reputation, the Four Knights contains sharp variations — especially the Belgrade Gambit and Halloween Gambit — that can catch unprepared opponents off guard. And at the top level, the Spanish Four Knights leads to rich strategic play.

Main line
1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Bb4 5. O-O O-O 6. d3 d6
Practice this opening →

Position after 6 moves · White to move

Key ideas

  • Both sides follow opening principles: develop knights before bishops, control the center
  • The symmetrical structure means White must find a concrete plan to create an imbalance
  • Bb5 (Spanish Four Knights) is the most popular continuation — mirrors the Ruy Lopez structure
  • The Halloween Gambit (Nxe5!?) is a risky but dangerous pawn sacrifice for attacking play
  • Great for beginners: the opening teaches correct development before tactics

Common variations

Spanish Four Knights
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6

Both sides mirror the Ruy Lopez structure. This is the line in the UltimaChess trainer — strategic and balanced.

Halloween Gambit
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5

White sacrifices a knight for central pawns and attacking chances. Extremely risky but practically dangerous.

Belgrade Gambit
1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nd5

White offers a pawn for rapid piece activity. Wild and tactically complex — a good surprise weapon.

Practice the The Four Knights Game

The UltimaChess opening trainer lets you watch the moves play out with a demo, then practice them yourself. Select Four Knights Game from the opening list to start.