411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. d4/2...exd4/3. Bc4/3...Nc6
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von der Lasa Gambit C21 von der Lasa gambit
3...Nc6
Black develops their knight on b8. 4. Nf3 transposes to the Scotch gambit.
4. Nf3 is the most common move, which transposes into the well-known Scotch gambit, more often seen from the move order 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4.
Theory table
4Dubois Réti defence(by transposition)Nf3
Nf6=
References