Red to play, mate in 2
Mate in 2, proven against every defence.
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 and a soldier.
The position
Red attacks with 3 cannons, 2 horses and a soldier, and Black's General stands on e9. Black's defenders: a elephant and a soldier.
- Mate in 2
- Cannon finish
- Rating 1806
Red moves first. Find the move that forces mate whatever Black replies, then open the solution below.
Show the solution
It starts with 炮 a8–a9. Look at what it does: it removes 1 escape point from the General, and leaves Black 1 legal reply, none of which help.
The line
- Red炮 a8–a9Check. Black must answer.
- Black將 e9×e10The toughest try, taking a piece with it.
- Red炮 f7–e7Checkmate.
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.
Why it is mate
This is the cannon behind the horse, 马后炮: the horse takes the escape squares and stands as the screen the cannon fires through. A blocking piece only becomes a second screen, so there is nothing to interpose.
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 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.
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