Chess Openings Lab
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Sicilian Defense: Prins Variation

The Prins Variation is 5.f3, where White protects e4 with a pawn instead of developing with Nc3. White keeps the option of c4 to build a Maroczy bind, while Black's best is ...e5, driving the d4 knight back before White's setup is complete.

Moves
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3
ECO
B54
Engine
−0.12 · level (Stockfish 17.1, depth 20)
Played
540 games in our lichess sample
White scores
54.8%

Key ideas for both sides

White

  • Use the free c-pawn: after ...e5 and Nb3, play c4 and Nc3 to clamp down on d5.
  • Develop with Be3 and Qd2, then castle where it suits; the f3 pawn keeps e4 solid against the f6 knight.
  • Against slow moves like ...e6, Nc3, Be3 and g4 give White a ready-made kingside attack.

Black

  • Strike at once with 5...e5 so the knight has to retreat to b3, then develop with ...Be7 and ...Be6.
  • If White plays c4, use ...Nc6 and ...a5 to pressure the b3 knight and the dark squares.
  • Avoid passive ...e6 setups that allow g4 and a fast pawn storm with f3 already played.

Plans and pawn structure

With f3 in place and the c-pawn still on c2, White can choose a Maroczy bind with c4 or a normal attacking setup with Nc3. After 5...e5 6.Nb3, Black has a backward d-pawn but good development with ...Be7, ...Be6 and ...Nc6. If White builds the bind, Black fights with ...a5 and ...a4 to dislodge the b3 knight and with ...Nd7 heading for c5. If Black plays slowly, White expands with g4 and castles long.

Where the engine's main line heads: Maroczy bind: White pawns on c4 and e4. The Maroczy bind: White pawns on c4 and e4 clamp the d5 square, so Black's ...d5 and ...b5 breaks are hard to play.

What the engine plays from here

Stockfish 17.1 at depth 20 rates the position −0.12: level. Its three top choices for Black:

  1. −0.12 5...e5 6.Nb3 Be7 7.c4 Be6 8.Be3
  2. +0.17 5...Nc6 6.Nc3 e5 7.Nb3 Be6 8.Nd5
  3. +0.40 5...e6 6.Nc3 Be7 7.Be3 Nc6 8.g4

Pawns, from White's side.

How it scores on lichess

540 rated lichess games reached this position; White scored 54.8%.

1200–159946.1%
1600–199956.2%
2000 and up55.2%

Light: White wins. Grey: draws. Dark: Black wins. About the sample.

Where it goes next

  • Prins Variation, Venice Attack5...e5 · rare

How to play against it

As Black, answer with 5...e5 and force the knight back before White plays c4 or Nc3. Develop quickly and look for ...a5 against a knight on b3. Avoid quiet ...e6 lines, where f3 and g4 help White's kingside attack. Keep the d6 pawn covered by your pieces.

Questions

What are the moves of the Sicilian Defense: Prins Variation?

The Sicilian Defense: Prins Variation starts 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3. Its ECO code is B54.

Is the Sicilian Defense: Prins Variation good for White?

Stockfish 17.1 rates the position −0.12 at depth 20, which is level. In 540 lichess games from our sample, White scored 54.8%. A flexible choice for White players who like the bind structure, while Black needs only to know that ...e5 comes at once.

What is the main idea of the Sicilian Defense: Prins Variation?

White defends e4 with f3 so the c-pawn can still go to c4. Black's best answer is ...e5, kicking the knight before White completes a Maroczy bind or a kingside attack.

What should Black play next?

The engine's first choice is e5, with Nc6 and e6 close behind. 5...e5 hits the d4 knight at once, and since White has no Nc3 yet, Black gains time for development.

Updated October 2026. Sources and method.