Modern Defense: Two Knights Variation, Suttles Variation

An entry in the Encyclopedia of Chess Openings (ECO B06), reached after 8 half-moves: 1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 d6.

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5.Bg5 1 line
- B06 Tal Gambit

About this opening

Modern Defense: Two Knights Variation, Suttles Variation is an opening in the Encyclopedia of Chess Openings, classified under code B06. 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 8 half-moves from the starting position, with the move sequence 1. e4 g6 2. d4 Bg7 3. Nc3 c6 4. Nf3 d6.

It belongs to the Modern Defense family. Within that family this is a level-2 branch (the Two Knights Variation → Suttles Variation line). The immediate parent line is Modern Defense: Two Knights Variation, transitioned via 4…d6.

The opening sequence in prose form: 1.e4 g6, 2.d4 Bg7, 3.Nc3 c6, 4.Nf3 d6. From this position exactly one named continuation is recorded in the encyclopaedia.