The first round: 50 people draw lots to play, ***25 games.
The second round: One of the 25 people passed directly by bye, and the other 24 people played 12 games.
Third round: Similarly, among 13 people, one was bye, and the remaining 12 people played 6 games.
Round 4: Similarly, among the seven people, one was bye, and the other six played three games.
The fifth round: four people played two games and won the last two.
Round 6: 2 pk, 1 win.
So the total number of games is:
25+ 12+6+3+2+ 1=49 games