411 REFERENCE · Wikibooks
Chess Opening Theory/1. Nc3/1...d5
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
van Geet opening A00 Starting position
1...d5
Black stakes a claim to the centre. Their d-pawn threatens to come to d4 and unseat White's knight.
If 2. d4, that danger is prevented. The game transposes into a version of the closed game where White's knight obstructs the usual move c4. No matter: White can try a Jobava-London system (Bf4) or Richter-Veresov attack (Bg5) instead.
2. e4 is more common, allowing 2...d4, which White answers with the manoeuvre Ne2 & Ng3.
Theory table
0 2. e4 d5 3. Ne2 e5 5. Ng3 Be6 - 2. d4 - Chigorin variation(by transposition)
References
See also
Dunst Opening