Chess Puzzles

A chess game is played among 3 players.
Rule: The person who wins a match will then compete with the other person sitting.

Suppose Vishu played 15 games, Magnus plays 19 games and Topolov plays 9 games.
Puzzle 1: How many games were played between Vishu and Magnus?

Options-

A) 5

B) 6

C) 10

D) cannot be determined

Puzzle 2: Game 11 was not played by whom?