BLACK TRAPTrap 1: The Kieninger Trap
How to avoid it: as White, after 7...Ngxe5 take the knight first with 8.Nxe5 Nxe5 and then play 9.e3. Do not take on b4 while the black queen is on e7 and a black knight can reach d3.
The Budapest Gambit, 1.d4 Nf6 2.c4 e5, is a sharp answer to 1.d4. Black gives the e5 pawn and tries to win it back with the knight. Many players on both sides lose in the first ten moves. This page has five real traps. Three are for Black: the Kieninger Trap, the Fajarowicz trap and a mate on d3 in the Fajarowicz. Two are Budapest Gambit traps for White, where a natural Black move loses a piece. Each trap is on its own board with the side lines, a Stockfish evaluation and a short "how to avoid it".

There is no Budapest Gambit video on our channel yet, so here is our general opening traps video: Stockfish 18 shows six traps every club player should know. Then replay the five Budapest traps below at your own speed.
| # | Trap | For | The mistake | Stockfish after it | What it wins |
|---|---|---|---|---|---|
| 1 | The Kieninger Trap | Black | 8.axb4?? | Mate in 1 | The game (mate) |
| 2 | The Fajarowicz Trap | Black | 6.g3?? | -1.3 for Black | The queen (7.Kxf2??) or a rook |
| 3 | Mate on d3 (4.Qc2 line) | Black | 10.Qd1?? | Mate in 1 | The game (mate) |
| 4 | Taking back on e5 too early | White | 6...Ngxe5? | +4.2 for White | A knight |
| 5 | The ...Qh4+ check | White | 5...Qh4+? | +3.4 for White | A knight |
How to use the boards: press ▶ Play or tap a move. The buttons above each board switch to the side lines (what if the other player plays something else). Arrows show the threats; draw your own with a right-click drag. The numbers are Stockfish 18 evaluations: + means White is better, - means Black is better.
All three Black traps end with a piece landing on a square White did not watch. Two of them end in the same mate: a knight on d3, with the e2 pawn pinned by the queen on e7. That is the main pattern to learn in the Budapest.
How to avoid it: as White, after 7...Ngxe5 take the knight first with 8.Nxe5 Nxe5 and then play 9.e3. Do not take on b4 while the black queen is on e7 and a black knight can reach d3.
How to avoid it: as White, after 5...Bxd6 play 6.Nbd2 and hit the e4 knight. Do not play g3 while a black bishop sits on d6 and the d-file is open. If you already played 6.g3 and Black takes on f2, play 7.Qd4!: you lose the rook on h1, not the queen.
How to avoid it: as White, after 6...Bf5 play 7.a3 and the game is level. Do not take a third pawn with dxc7 while your king is still in the centre, and never leave d3 to a black knight when the e2 pawn is pinned.
The White traps punish Black for hurrying. In the Budapest Gambit Black wants the e5 pawn back, and in both traps Black reaches for it (or for a quick check) one move too early. Stockfish gives White a whole piece in both lines.
How to avoid it: as Black, count the attackers before you take on e5. In the Rubinstein Variation play 6...Qe7 first, and only then ...Ngxe5.
How to avoid it: as Black, after 5.f4 move the knight back with 5...Nec6 (or 5...Ng6). A check is only good if it also does something.
The first known game with 2...e5 was a casual game between Mór Adler and Géza Maróczy in Budapest in 1896. Maróczy said the idea came from Zsigmond Barász, and István Abonyi and Gyula Breyer worked on it further. The gambit became famous in 1918, when Milan Vidmar used it to beat Akiba Rubinstein in 24 moves in Berlin.
The Kieninger Trap is named after the German player Georg Kieninger (1902-1975). The Fajarowicz Variation, 3...Ne4, carries the name of Fajarowicz: its first important game was H. Steiner vs Fajarowicz at the Wiesbaden tournament of 1928. Stockfish does not trust it: after the best moves White is clearly better. That is why it is played mainly as a surprise, for its traps.
Most Budapest Gambit traps use the same three ideas. Learn them and you are safe with either colour:
For the main ideas of the gambit, see the Budapest section of our best gambits for Black article. Another sharp reply to 1.d4 is the Englund Gambit, and the traps of the main 1.d4 opening are in our Queen's Gambit traps.
The Kieninger Trap: 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 Nc6 5.Nf3 Bb4+ 6.Nbd2 Qe7 7.a3 Ngxe5 8.axb4?? Nd3#. The e2 pawn is pinned by the queen on e7, so it cannot take the knight.
It comes from the Fajarowicz Variation, 3...Ne4. After 4.Nf3 d6 5.exd6 Bxd6 6.g3?? Nxf2! 7.Kxf2?? Bxg3+ the bishop gives check and the black queen takes the white queen on d1. Even after the best defence 7.Qd4, Black wins the rook on h1.
Yes. Black often hurries to win the e5 pawn back. In the Rubinstein Variation 6...Ngxe5? loses a knight to 7.Nxe5 Nxe5 8.Bxe5, and in the Alekhine Variation 5...Qh4+? 6.g3! hits the queen and the knight at the same time.
It is playable but not fully sound. Stockfish gives White a small edge, about +0.8, after 3.dxe5 Ng4. The Fajarowicz 3...Ne4 is riskier: about +1.0 for White after 4.Nf3.
After 7...Ngxe5 take the knight first with 8.Nxe5 Nxe5, then play 9.e3. Taking the bishop on b4 (on move 8 or 9) runs into ...Nd3 mate.
Simple development works well. In the Rubinstein Variation (4.Bf4) White guards e5 twice. In the Alekhine Variation (4.e4) White gives the pawn back for a big centre. Both give White a small, safe edge.
Play the Budapest Gambit against a bot and see who walks into the Kieninger Trap first.