Mate in 1

Mate in 1 is a puzzle where a single move you play right now delivers checkmate. It is the most basic tactic and the starting point of all mating calculation. It is also one of the largest categories in our puzzle database. Once the habit of "give the check, then confirm the king has no reply" is in place, forced mates two and three moves deep read the same way.

How to find a mate in one

The method is simple. Run through every check you could give, then confirm the king has no reply to it. If there is no reply at all, that move is mate.

Below is a position from our puzzle set (White to move). White has 44 legal moves, and exactly three of them give check: Qxf7+, Bxh7+, and Qxh7#. Three checks, but only one of them is mate. Stop at "I found a check" and you play one of the other two.

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The answer is Qxh7#. The queen takes the h7 pawn and checks the g8 king, and the d3 bishop defends it, so Kxh7 is illegal. The king's other squares are all blocked by its own pieces: f8 by its rook, f7 and g7 by its pawns.

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When a check is not mate

Most missed mates in one come down to one thing: you saw the check but did not confirm it was mate. For a check to be mate, the opponent must have none of three replies available.

• The king has no square to flee to: every neighbour must be blocked or attacked.
• The checking piece cannot be captured: if it can be taken, the check is over. That is why a piece checking from an adjacent square has to be defended.
• The check cannot be blocked: if it comes from a distance, no piece can be interposed in between.

The other check in the example above, Qxf7+, is exactly that. It is a check, but Black is left with four replies.

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And in the same position, removing the d3 bishop alone turns the actual mate back into a plain check.

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A single defender is the difference between a mate and a plain check. Once you find a check, the key is to erase each of the opponent's three replies one by one.

Mate in one, in our data

Our puzzle database has 23,166 problems tagged as Mate in 1 (counted July 2026), second only to Mate in 2 (25,089) among the move-count mate categories. 82% sit below rating 1200 and the lowest is 469, so it is a fundamental that shows up from the very bottom band.

A mate in one is not always a specific named pattern. Most are simple mates with no special name, and named patterns co-occur at 3% or less each. In our data, the named patterns that most often accompany a mate in one are the Opera Mate (3.1%), the Pillsbury Mate (2.3%), and the Smothered Mate (2.3%). The shape in the example above, a queen and bishop both aiming at h7, is one of the most common types that carries no particular name at all.

Defending against it

• Give your king luft. Pushing a pawn in front of the king ahead of time opens an escape square and avoids the mates in one that come from every neighbour being blocked.
• Watch for a defended piece landing next to your king. A queen or rook checking from an adjacent square, backed up by another piece, is the warning sign.
• Count the checks your opponent has. If several moves can check your king, one of them may be mate. In the example above, Black was finished by one of the three checks White had available.

References

• Lichess, puzzle theme Mate in 1 (the source of this site's puzzle tags). https://lichess.org/training/themes
• Statistics from scripts/analyze-mate-in-one-stats.mjs; results recorded in docs/data/mate-in-one-stats.md.

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Related: Back Rank Mate · Smothered Mate · All tactics