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棋逢对手

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Red to move. There is exactly one winning first move here, and it mates in 3 against anything Black tries. Black's remaining force: a advisor, a horse, a elephant, a soldier and a chariot.

楚河漢界士將馬象俥卒車炮俥帥

The position

Red attacks with 2 chariots and a cannon, and Black's General stands on d8. Black's defenders: a advisor, a horse, a elephant, a soldier and a chariot.

  • Mate in 3
  • Chariot finish
  • Rating 2236

Red moves first. Find the move that forces mate whatever Black replies, then open the solution below.

Show the solution

It starts with 俥 i8×i7. Look at what it does: it takes a defender off the board on the way, and leaves Black 11 legal replies, none of which help.

The line

  1. Red俥 i8×i7Quiet, and there is no answer to the threat.
  2. Black馬 g8–e7Black's most stubborn defence.
  3. Red俥 i7×e7Quiet, and there is no answer to the threat.
  4. Black士 d9–e8Black's most stubborn defence.
  5. Red俥 e7–d7Checkmate.

Black has 11 legal moves after the first blow and each was refuted to mate. The main line shown is the toughest defence rather than a convenient one.

楚河漢界將士象卒俥炮俥帥

Why it is mate

The chariot arrives on a line the defence cannot close. Chariots are the strongest pieces on the board and most finished attacks end with one, which is why a defender will trade almost anything to swap them off first.

Read about this pattern

How this puzzle was checked

Nothing here is an engine opinion. The position was solved by trying every legal defence to the full mate distance, so the claim that Red mates in 3 is a proof rather than an evaluation, and the first move shown is the only one that works. The defence in the line above is Black’s most stubborn try, not a convenient one.

Next puzzles

New to mating patterns? The glossary names the ones that come up again and again, the piece guides explain what each piece can do, and the rules page covers everything from the start.