Library/Openings/Sicilian Defense/Closed/Portland Attack ECO B23
Opening· 7 plies

Sicilian Defense: Closed, Portland Attack

An entry in the Encyclopedia of Chess Openings (ECO B23), reached after 7 half-moves: 1. e4 c5 2. Nc3 Nc6 3. d3 g6 4. g4.

Sicilian Defense: Closed, Portland Attack ECO B23
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Black rook
Black bishop
Black queen
Black king
Black bishop
Black knight
Black rook
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black pawn
Black knight
Black pawn
Black pawn
White pawn
White pawn
White knight
White pawn
White pawn
White pawn
White pawn
White pawn
White pawn
White rook
White bishop
White queen
White king
White bishop
White knight
White rook
7/7
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End of this line

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About this opening

Sicilian Defense: Closed, Portland Attack is an opening in the Encyclopedia of Chess Openings, classified under code B23. ECO group B (B00–B99) covers semi-open games (1.e4 with Black playing anything other than 1…e5), with the Sicilian, French, Caro-Kann and Pirc/Modern at its heart. This particular variation is reached after 7 half-moves from the starting position, with the move sequence 1. e4 c5 2. Nc3 Nc6 3. d3 g6 4. g4.

It belongs to the Sicilian Defense family. Within that family this is a level-2 branch (the Closed → Portland Attack line). The immediate parent line is Sicilian Defense: Closed, transitioned via 4.g4.

The opening sequence in prose form: 1.e4 c5, 2.Nc3 Nc6, 3.d3 g6, 4.g4. From this position the encyclopaedia records no further canonical continuations — practical play branches into unnamed transpositions or returns to the parent line for alternative ideas.