Next topic is a strong king. This piece could be very active mostly in endgames. Then the king is one of the strongest pieces. From this rule there are some exceptions. One of them is famous game Short - Timman Tilburg 1991, where the king run to attack in middle game.
The last example shows very active king in the endgame with 2 minor pieces and 2 rooks. Only active king could win the position for black. With some pawns down I try to take a risk. I should add that this game was played during European Blitz Chess Championship and there were more mistakes then in classical game.