X01 170

Game objective: reduce your score from 170 to exactly zero using as few darts as possible.

Each visit consists of up to 3 darts. The value of every dart is subtracted from your current score.

Double Out: the final dart must hit a Double. The 50-point Bull also counts as a valid Double.

Bust: if you go below zero, leave a score of 1 or reach zero without finishing on a Double, the entire visit is cancelled and your previous score is restored.

The game ends when you correctly reach zero. The fewer darts you need, the better your result.