Chess Opening Theory/1. d4/1...Nf6/2. c4/2...e5/3. d5

White avoids taking the free material, but this gives Black an easy time. If White wished to sidestep the complications of the gambit, a better try was to have taken the pawn then returned it.

This allows Black 3...Bc5, exerting pressure on f2. A continuation is 4. e3 d6 5. Bd3 O-O 6. Nc3. Black can solve the problem of their queenside knight by playing ...a5 and ...Na6.

It is advisable for White to play e3 to relieve the pressure on f2, and prevent Black's bishop from coming to d4. Otherwise they can soon run into issues, e.g. 4. Nf3 d6 5. Nc3 O-O 6. e4? (thinking to take central space) Ng4! (threatening Nxf2 with a fork)∓.

One problem for White is where to play their queen's bishop: Bg5 is a blunder on account of the pressure on f2, e.g. 4. Bg5?? Bxf2+ 5. Kxf2 Ng4+ 6. Ke1 Qxg5=. It can end up a "French bishop", stuck on the back rank behind the e3 pawn.

3...Bb4+ is an alternative. White may interpose with 4. Bd2 or 4. Nd2 to avoid doubled pawns.

For explanation of theory tables, see theory table and for notation, see algebraic notation.

1. d4 Nf6 2. c4 e5 3. d5

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Wikipedia has related information at Budapest Gambit