Openings · C25–C29

Vienna Game

The quiet knight move that keeps a gambit in reserve: develop, and decide later whether to play f4.

1.e4 e5 2.Nc3played as White

The idea

2.Nc3 develops, defends e4 and commits to nothing. It is the move you play when you want the option of f2–f4 — the King's Gambit a move late, with the knight already out and the check on h4 covered — without having to play it against everything.

Two games live inside it. The quiet one is 3.g3 and Bg2, a slow build where the knight on c3 supports d5 and the bishop stares down the long diagonal. The sharp one is 3.f4, which is a real gambit and needs real preparation. Choosing which to play against which reply is the whole skill of the opening.

Practise the line

You play White; the other side answers on its own. Nothing here is saved or graded.

Your move 1 of 20/2

1.e4e5
2.Nc3

Your move. Drag a piece, or tap it and then its square.

Common mistakes

Three that come up again and again below master level. Each is ordinary opening theory — a named trap, or the error every coach corrects — not a statistic, and not drawn from anybody's games.

Recapturing on e4 with the knight

1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Nxe4 d5

The mistake: Meeting 3…Nxe4 by taking the knight back, as though material were the point.
Why it costs: 4…d5 forks the bishop on c4 and the knight on e4, and Black gets the piece straight back with a pawn in the middle of the board and a free game. The whole 3.Bc4 line depends on not doing this.
Instead: 4.Qh5, the Frankenstein–Dracula, when 4…Nd6 5.Bb3 keeps a sharp game — or the simple 4.Bxf7+ Kxf7 5.Nxe4 first, which wins the piece back on your terms.

The gambit played on autopilot

1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+

The mistake: Grabbing the centre with 4.d4 after the gambit is accepted, without a knight on f3.
Why it costs: 4…Qh4+ is check, and the only move is 5.Ke2. White has lost the right to castle on move five, with the king on the file about to be opened. It is the same accident the King's Gambit is built to avoid, arrived at a move later.
Instead: 4.Nf3, which covers h4 first. That move order — knight before pawns — is the reason for playing the gambit from the Vienna at all.

Expecting the pawn to be taken

1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4

The mistake: Playing 3.f4 against 2…Nf6 in the belief that it wins a pawn.
Why it costs: 3…d5 is the answer, and it is not a defence — it is a counterattack in the centre that ignores the gambit entirely. After 4.fxe5 Nxe4 Black has a knight on e4, a pawn on d5 and nothing to fear.
Instead: Play 3.f4 knowing 4.fxe5 Nxe4 5.Nf3 is an ordinary sharp position rather than a free pawn, or answer 2…Nf6 with 3.g3 or 3.Bc4 and keep the gambit for 2…Nc6.

Try it on one of your own

The board above is for the line itself; this is for a game you played. Paste a game in this opening, or pull one from chess.com, and every move is graded against what the engine would have played. Open the board, read how the grading works, or go back to the other openings.