Tsume shogi, or just tsume for short, are Japanese chess mating puzzles. I just created a browsable tsume shogi database, so I thought it might be a good idea to explain tsume rules, background, and their benefits.
Imagine a situation where you are playing a much more skilled shogi player than yourself. You are losing. Your opponent will place you in checkmate in one move. You are desperate. Your only chance is to check your opponent, and keep him in check until you have a checkmate. Otherwise, you will lose the shogi game.