In the game they are playing they have to get 501 points. The outside ring of the board doubles each sections point value and the inside ring on the board triples the value. The area they are shooting for is in the middle ring of the 20 section so it is worth 60 points.

This guy threw his first three darts there which gave him 180 points so 501-180 leaves him with 321 poi ts to get. The second round he does it again so 321-180 leaves him with 141. Third round he hits triple 20 for 60 triple 19 for 57 and double 12 for 24 which equals 141. That gets him down to zero and the win.

In this game you have to hit exactly 501 and if you go over your last dart doesnt count. That means with his 9 darts he threw a perfect game and won in just 3 rounds.