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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 2 against anything Black tries. Black's remaining force: a elephant.

楚河漢界將炮象兵兵傌帥

The position

Red attacks with a cannon, 2 soldiers and a horse, and Black's General stands on d9. Black's defenders: a elephant.

  • Mate in 2
  • Soldier finish
  • Rating 1638

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

Show the solution

It starts with 兵 e7–e8. Look at what it does: it removes 2 escape points from the General, and leaves Black 1 legal reply, none of which help.

The line

  1. Red兵 e7–e8Quiet, and there is no answer to the threat.
  2. Black將 d9–d10Black's most stubborn defence.
  3. Red兵 e8–e9Checkmate.

Black has 1 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.

楚河漢界將兵炮象兵傌帥

Why it is mate

A soldier gives the mate, which only happens once it has crossed the river and can step sideways. It is the cheapest piece on the board finishing a game, and it is a reminder that a crossed soldier is an attacker rather than a wall.

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 2 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.