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Chess Opening Theory/1. Nc3/1...c5
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van Geet opening A00 Starting position
1...c5
Black invites a transposition into the closed Sicilian, 2. e4.
If White wishes to avoid (or, at least, delay) the transposition they can try 2. Nf3?!, where 2...Nc6 3. d4 cxd4 4. Nxd4 is a line Schiller christened the "Sicilian two knights,"Unorthodox Chess Openings Schiller Eric Cardoza Publishing 1998 0-940685-73-6 New York 438-448 though White has the accept the possibility of 2...d5.
2. d4!? cxd4 3. Qxd4 Nc6 4. Qh4?! is the Novosibirsk variation, as Schiller calls it.
Theory table
0 2. e4 - Closed Sicilian(by transposition) 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Sicilian two knights
References
See also
Dunst Opening