Chess quiz for the community

1. Who was the first chess player to win the World Chess Championship three times in a row?
2. In what year and city was the first official FIDE World Chess Championship held?
3. What is the name of the chess opening that begins with the moves 1.e4 e5 2.Nf3 Nc6 3.Bb5?
4. Who was the youngest person to become the official World Chess Champion?
5. What is the name of the chess strategy that involves giving up material in order to gain a positional advantage?

There is no price to win, but fun :-)