Dear Kids,
Have you been playing chess lately? Of course you have. Good for you.
You are probably too young to remember The Original Legend of Zelda. That's okay. Suffice it to say, Zelda was a pretty cool video game back in the Days Before XBOX. The idea was you had to save the princess, and there were all these crazy obstacles in your way. There were dungeon bosses, and these strange little frozen snail things and snouty orange monsters... And somehow you had to get rid of the guard to get inside the castle.
Imagine there was some other creature in Zelda who was on your team.
If he pounced on the guard, then the gates would open!
So, let's say in chess, the Knight is the one guarding the castled King, and we have to use our Rook to eliminate the Knight, and send him to time out, while our Queen gives a checkmate safely guarded by, maybe a Bishop.
Here is what I mean: