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Openings › Mate in one › May 2026 › Exercise 2 of 4

Mate in one: Black to move (exercise m1-e52008b11f)

Black to move and mate in one. In this position Black can give checkmate with one move. The position comes from a rated Lichess game of May 2026.

Last move: 18.Ke1 (White's king from f2 to e1); its two squares are marked on the board.

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Pick a piece, then its square. Keyboard: Tab to the board, arrow keys to move, Enter or Space to pick.

Hint 1: which piece?

Look for a queen move.

Hint 2: which square?

The mating move goes to g1.

Show the solution

One move gives checkmate:

  1. Qxg1# (d4 to g1). After this move, the black queen on g1 gives check to the white king on e1, and White has no legal move: checkmate. The white king on e1 has no safe square to go to (d1, d2, e2, f1 and f2). Its own pawn on e2 stands in the way. d1 is covered by the black rook on d8 and the black queen on g1. d2 is covered by the black rook on d8. f1 is covered by the black queen on g1 and the black bishop on h3. f2 is covered by the black queen on g1. No white piece can capture the black queen on g1. No white piece can move to f1 to block the check.

Our code tried every legal move of Black in this position: this is the only move that gives checkmate.

The position as text

Where this exercise comes from

The position comes from a rated game in our sample of the Lichess open database (CC0 1.0), from the monthly file of May 2026. In that game Black gave checkmate with the next move. We show no player names and no link to the game. Our code tried every legal move of the position and lists every move that gives checkmate; the list, the hints and the explanations are checked again each time the site is built. How the exercises are chosen: Mate in one and How it works.