Sometimes, when you are trying to checkmate the opposing king, you find that all your queens, bishops, knights, rooks, and pawns aren't enough. Therefore, the king must be enlisted to increase the pressure. In my database I encountered an entertaining game on this theme. Against Lajos Portisch in 1984, Joszef Pinter used his king to mount an attack. Pinter's king didn't manage to charge up the board quite as far as this one:
However in the game you are about to see, Portisch's king walks all over the board as well... but only in the role of prey.
First, see if you can improve on Portisch's play at the pivotal moment:
Now here's the game.
To conclude, what have we learned from this game? From the examples given we can deduce a rule of thumb:
If your attack does not quite seem to be working, you should send your king to the middle of the board.
But keep in mind, every rule has exceptions!