Chess Openings Lab
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Vienna Game Qxf7 mate

In the Vienna Game, Black takes the e4 pawn and White answers 4.Qh5, hitting f7. If the knight retreats with 4...Nf6, it also attacks the queen but leaves f7 open, and 5.Qxf7# is mate.

Opening
Vienna Game: Frankenstein-Dracula Variation
Moves
1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nf6 5.Qxf7#
Set by
White
The mistake
4...Nf6
Checked
every move legal; result confirmed by Stockfish 17.1

How the trap works

This trap comes from the Vienna Game: 1.e4 e5 2.Nc3 Nf6 3.Bc4. Black takes the center pawn with 3...Nxe4, a known and playable idea, and the evaluation stays level.

White answers 4.Qh5. The queen attacks f7, joining the bishop on c4. It also attacks the e5 pawn. Black has to defend f7 right now, because Qxf7 is already a mate threat.

  • 4...Nf6? is the mistake. The knight retreats with an attack on the queen, but it does nothing for f7.
  • 5.Qxf7#. The queen takes the pawn with check. The bishop on c4 protects it, so the king cannot capture. The king's other squares are covered by the queen or blocked by Black's own pieces.

The tactical idea is a queen and bishop battery on f7, the same pattern as Scholar's Mate. Here it appears from a real opening line, which makes it easier to fall into.

The exact moment it goes wrong is 4...Nf6. Black should retreat the knight to d6 instead. From there, the knight attacks the bishop on c4 and covers f7. If the bishop retreats, f7 is safe and the game stays level.

Compare the two knight retreats. On f6 the knight hits the queen but leaves f7 to the king alone. On d6 it guards f7 and attacks the bishop, and it attacks the bishop that backs up the queen. One square makes the difference between a level game and mate.

The lesson is that counterattacking the queen is not a defense if the queen can mate first. Before playing a move that hits the queen, make sure it also answers her threat.

How Black avoids it

Black should play ...Nd6. The knight attacks the bishop on c4 and guards f7 at the same time, and the evaluation before the mistake shows a level game.

Questions

How does the Vienna Game Qxf7 mate work?

The queen on h5 and the bishop on c4 both aim at f7, a square only the king defends. After 4...Nf6 the queen takes on f7 with check, the bishop protects her, and the king has no squares.

What is the losing move in the Vienna Game Qxf7 mate?

Black's mistake is 4...Nf6. Black should play ...Nd6. The knight attacks the bishop on c4 and guards f7 at the same time, and the evaluation before the mistake shows a level game.

Is the Vienna Game Qxf7 mate worth playing for?

Yes for White. 4.Qh5 is a normal answer to 3...Nxe4, and the evaluation stays level if Black defends by retreating the knight to d6.

Where it comes from

More opening traps