Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation

An entry in the Encyclopedia of Chess Openings (ECO D31), reached after 9 half-moves: 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. Bg5.

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5…f6 1 line
- D31 Belyavsky Line

About this opening

Semi-Slav Defense: Noteboom Variation, Anti-Noteboom Variation is an opening in the Encyclopedia of Chess Openings, classified under code D31. ECO group D (D00–D99) covers closed games and semi-closed games beginning 1.d4 d5, covering the Queen's Gambit, Slav, Grünfeld and related queen-pawn structures. This particular variation is reached after 9 half-moves from the starting position, with the move sequence 1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 dxc4 5. Bg5.

It belongs to the Semi-Slav Defense family. Within that family this is a level-2 branch (the Noteboom Variation → Anti-Noteboom Variation line). The immediate parent line is Semi-Slav Defense: Noteboom Variation, transitioned via 5.Bg5.

The opening sequence in prose form: 1.d4 d5, 2.c4 e6, 3.Nc3 c6, 4.Nf3 dxc4, 5.Bg5. From this position exactly one named continuation is recorded in the encyclopaedia.