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Chess Opening Theory/1. d4/1...f5/2. g3
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Dutch Defence A81
2. g3
This is considered to be the main line of the Dutch defence at the highest level of play.youtube.com https://www.youtube.com/watch?v=p0jl7Jxq8rg&t=5640 GM Neiksans Boot Camp #9 - Leningrad Dutch GM Arthur Neiksans
The moves /2...Nf6/ 3. Bg2 are played virtually every game, and it is from there that the positions start to branch out.
Theory table
Leningrad variation 2. ... Nf6 3. Bg2 g6 4. Nf3 Bg7 5. O-O O-O 2. ... ... 3. ... ... 4. Nh3 Bg7 5. Nf4 Nc6 Classical variation 2. ... ... 3. ... e6 4. c4 d5
References
Nunn's Chess Openings. 1999. John Nunn (Editor), Graham Burgess, John Emms, Joe Gallagher. 1-8574-4221-0.
Modern Chess Openings: MCO-14. 1999. Nick de Firmian, Walter Korn. 0-8129-3084-3.
See also
Dutch Defence