Caissa Codex
B27

Sicilian Defense: Acton Extension

Chess diagram: Sicilian Defense: Acton Extension after 3…Bh6

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Statistics from Lichess

98 games: White 54.1% / Draw 6.1% / Black 39.8%

The moves played next. Pick one to see it on the board.
Next moveGamesWhite / Draw / BlackW / D / B
5252
2929
1313
33
11

Rated Lichess games between players rated 1600 to 2500, from the Lichess opening explorer, updated Oct 30, 2026

Engine evaluation

+0.80 White is better

Best play: 4. Nc3 Bg7 5. d4 cxd4 6. Nxd4 Nc6 7. Be3 d6 8. Be2 Nf6

Stockfish 19, depth 30, after the line's last move. Scores are in pawns, from White's side.

Overview

Sicilian Defense: Acton Extension (ECO B27, Semi-Open Games) is a variation of the Sicilian Defense: Hyperaccelerated Dragon, reached after 1. e4 c5 2. Nf3 g6 3. c4 Bh6 (3 moves).

In 98 rated Lichess games between players rated 1600 to 2500, White won 54.1%, Black 39.8% and 6.1% were drawn. White's most played move here is 4. Nc3, in 53% of those games. That is too few games for the percentages to mean much.

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Other lines from the same position

Instead of 3. c4 Bh6, the position after Sicilian Defense: Hyperaccelerated Dragon also goes on to:

Cite this page

Caissa Codex. “Sicilian Defense: Acton Extension (B27)”. Lichess data as of 30 Oct 2026. https://chesscodex.org/openings/sicilian-defense-acton-extension

https://chesscodex.org/openings/sicilian-defense-acton-extension