Red moves and mates in 1
Mate in 1, proven against every defence.
Red is to move and forces mate in 1. Black is not helpless: there is a advisor still on the board, and every legal defence has been tried against this solution. All of them lose.
The position
Red attacks with a chariot, a soldier, a horse and a cannon, and Black's General stands on d9. Black's defenders: a advisor.
- Mate in 1
- Soldier finish
- Rating 1102
Red moves first. Find the move that forces mate whatever Black replies, then open the solution below.
Show the solution
兵 b9–c9 is the only move that wins.
The line
- Red兵 b9–c9Checkmate.
There is nothing to try. The General cannot move, the checking piece cannot be taken, and nothing can be interposed.
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 patternHow 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 1 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.
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