In this video, I'll be talking about checkmate problems. A checkmate problem can be made for shogi training, and also can be made as a work of art. You'll see three mate problems which I made myself. The last one, mate in 27, is pretty interesting, so why don't you solve it yourself? I'll also show you some of the most artistic mate problems that are made in the 18th century of Japan which we call Edo era. And you will see the longest-moves mate problem on earth in the last of my video. Don't miss it!