Chessy
The Mortimer Trap
White played 5.Nxe5, grabbing a pawn and landing in the Mortimer Trap. As Black, you have a concrete response that gives you the better game — find it against the engine.
Punish the Mortimer Trap against the engine
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Create a free account →The setup: baiting Nxe5
From 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7 — Black's knight retreats to e7, a move that looks passive and invites White to snap off the e5-pawn. 5.Nxe5 walks right in. The trap is named after the English master James Mortimer and is one of the classic 'if you grab the pawn…' traps in the Ruy Lopez.
The response: c6! and activity
The engine's top move is 5...c6, attacking the b5-bishop immediately. After 6.Nxf7 Kxf7 7.Ba4, Black has traded a bit of king safety for real compensation: the e5-pawn is gone, White's knight is off the board, and Black's pieces gain central space. Stockfish evaluates the resulting position at –1.21, a clear and meaningful edge for Black. It's not a free piece win — it's a positional advantage where Black has the initiative and better coordination.
Why the trap works
4...Ne7 looks like an aimless retreat, but it sets a specific purpose: if White plays Nxe5, the c6 counter-attack hits the bishop while exposing White's overextended knight. White grabbed a central pawn at the cost of development tempo and king-side stability. The position after 7.Ba4 may look roughly equal at a glance, but Black's activity and the open f-file give concrete long-term compensation for the pawns invested.
How to avoid it (as White)
Don't take the e5-pawn with the f3-knight on move 5. Instead, 5.O-O, 5.Nc3, or 5.c3 keep the game balanced without walking into the trap. The Ne7 retreat is suspicious precisely because it's unusual — that's the cue to stop and ask what Black wants before capturing. Entering the Mortimer Trap with 5.Nxe5 leaves White scrambling on both wings.
Results across 20,118 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| c6 | 19,325 | 36.5% |
| a6 | 396 | 70.7% |
| Ng6 | 183 | 64.5% |
| g6 | 54 | 57.4% |
| c5 | 46 | 78.3% |
| h6 | 45 | 64.4% |
Frequently asked questions
What is the Mortimer Trap?
A Ruy Lopez trap arising after 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7 5.Nxe5??. Black responds 5...c6, attacking the bishop, and after 6.Nxf7 Kxf7 7.Ba4, Black holds a clear positional edge of about –1.21 according to Stockfish.
Does Black win a piece in the Mortimer Trap?
No — the evaluation after best play is about –1.21, a solid positional advantage but not a piece up. Black gets strong activity and the initiative in exchange for some king safety. The trap punishes White's greed, but the advantage requires accurate follow-up play.
Why does 4...Ne7 work as a trap move?
It looks passive enough to invite 5.Nxe5 (a free pawn), but the follow-up 5...c6 immediately counterattacks the b5-bishop, putting White on the back foot. The knight on e7 also prepares to re-route to g6 or f5 with tempo.
How does White avoid the Mortimer Trap?
After 4...Ne7, decline the e-pawn. Play 5.O-O, 5.Nc3, or 5.c3 to keep a normal game. 5.Nxe5 is the only move that falls into the trap, and an unusual knight retreat like Ne7 is always a signal to look one move ahead before taking material.