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Openings › Mate in one › May 2026 › Exercise 1 of 4

Mate in one: White to move (exercise m1-0c6b51ba87)

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

Last move: 33…Kh8 (Black's king from g8 to h8); 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 knight move.

Hint 2: which square?

The mating move goes to f7.

Show the solution

One move gives checkmate:

  1. Nf7# (d6 to f7). After this move, the white knight on f7 gives check to the black king on h8, and Black has no legal move: checkmate. The black king on h8 has no safe square to go to (g7, g8 and h7). g7 is covered by the white queen on g6. g8 is covered by the white queen on g6. h7 is covered by the white queen on g6. No black piece can capture the white knight on f7. A knight's check cannot be blocked.

Our code tried every legal move of White 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. From a game that began with the Slav Defense. In that game White 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.