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Chess Opening Theory/1. e4/1...Nf6/2. Nc3
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Alekhine's defence B02 Alekhine's defence
2. Nc3!?
White defends e4 while developing a piece. This is solid but less testing than 2. e5.
This allows Black to play 2...e5 and transpose into a Vienna game.
However, if Black thinks White is too eager to avoid the Alekhine's defence then they may avoid transposing with 2...d5, the Scandinavian variation.
Theory table
2...d5 3. e5 Nfd7 4. d4 c5 5. f4 cxd4 6. Nb5 Nc6 7. Nf3 Scandinavian variation + 2...e5 Vienna game, Falkbeer defence(by transposition)
References
See also
Alekhine's Defence