Winning at darts is dependent upon the type of dart game played.
The following site seems to explain each game well:
http://www.recroom-products.com/howtoplaydarts.html
in the event of a tie break the highest score obtained in nine darts wins.
Golf is the only sport where lowest score wins
To play darts effectively and keep score, aim to hit the target on the dartboard with precision. Each player takes turns throwing three darts per round, aiming to score points by hitting specific areas on the board. Keep track of points by subtracting the score from the total at the start of each round. The player with the highest score at the end wins.
Impossible as maximum score with 2 darts is 120! T17-D20 and T19-D17
You can score 180 on darts
Darts
60, the highest single-dart score on the board
12
180 is the highest score in darts. Three triple 20s is worth 180 points.
A shanghai is a single, a double, and a triple of the same number in one throw of three darts.
507
420