This checkmate occurs when the King is surrounded by his own pieces and so cannot move. If it can then be checked, the blocked in King is liable to be checkmated.
Here is an interesting example of smothered mate. But there is a twist. First of all, you have to get the White King out into the open. Then you can block it in again and deliver mate. How does White do that?
The solution to last Monday’s problem is that White plays 1. Qg5+ Kf8 2. Qd8+ Qe8 and now comes the winning move 3. Ng6+. This is only made possible by having an advanced pawn, which can become a Queen if we can move the Black h-pawn out of the way.
Black has to play 3… Kf7 and White then plays 4. Nh8+ Kf8 5. Qf6+ Bf7 6. Ng6+ hxg6 7. h7 and wins.
Here is this weeks problem.