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TacticsPlay as white

Mate in One

Train the eye that ends the game: one move, king trapped, nothing to be done.

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Introduction

Every checkmate is the same three questions: can the king move away, can something block, can something capture the attacker? When all three answers are no, the game is over. Here you get one move to make that happen.

Lesson Content

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Try this position

The black king on h6 is already boxed in. The white king on f6 covers g5 and g7, and the pawn on g6 covers h7. Only one thing is missing: something to attack the king itself.

Mating Net
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1. ..Rh8#

The rook swings to the h-file and it is checkmate. The king cannot step off the file, every flight square is covered, and no black piece can reach h8 or the squares in between.

Mating NetBack Rank
Alternative Moves
Ra6 — A reasonable-looking rook move — but the mate was there and now Black gets time to bring the knight and bishop back into the game.
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2. Qa8#

Checkmate. The queen attacks along the eighth rank; the king on c8 cannot take it, b7 is covered by the queen's diagonal, and c7 is covered by the bishop on f4. The rook on d8 blocks its own king's last square.

Mating NetBack Rank
Alternative Moves
Qa6+ — Another check, and White is still much better — but the king walks out via b8 and d7, and a forced mate has been thrown away for a long grind.
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Try this position

Black looks threatening — a queen on c3 and a knight on c4 near the white king. But it is White to move, and the black king on a8 is walled in by its own rook on b8. The only free square around it is b7: cover that with a check the king cannot answer, and the game ends before Black's pieces matter.

Mating Net
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3. Qa6#

The queen lands on a6 and it is mate. It attacks a8 down the a-file, covers b7 on the diagonal, and Black has nothing that reaches a6 or a7.

Mating Net
Alternative Moves
Qxd5+ — Winning a pawn with check feels safe, but 1...Rb7 blocks, the mate on a6 is gone, and White has traded a forced win for a single pawn while Black's queen and knight go after the white king.
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The black king on g8 has never made luft — the pawns on f7, g7 and h7 are all still home. Which move ends the game on the spot?

Mating NetBack Rank
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Try this position

Before you play a mate, which three questions should you answer?

Mating Net

Key Takeaways

  • Count the king's escape squares first — the mate is usually the move that attacks it while they stay covered.
  • A king with all three pawns still in front of it is a back-rank mate waiting to happen.
  • A check that is not mate can throw a mate away; look for the finish before you check.

Now play it through

Step through every move on a real board, try the wrong ones, and ask Knighty why they fail.

Practice Interactively

Related Lessons

Hanging Pieces

Back-Rank Mate

Mate in Two

Summary

A mate in one is a counting exercise, not a flash of genius: find the king's free squares, notice which of your pieces already cover them, and then look for the move that attacks the king without giving anything back.

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Practice Interactively

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The Fork

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