Most professional matches are "501 up". This is the simplest of games. Each player starts with a score of 501 and takes turns to throw 3 darts. The score for each turn is calculated and deducted from the players total. Bullseye scores 50, the outer ring scores 25 and a dart in the double or treble ring counts double or treble the segment score. The objective is to be the first player to reduce the score to exactly zero, the only caveat being that the last dart thrown must land in a double or the bullseye.

When the score goes below 171, professional players know the numbers to aim at in order to check out in a single turn with 3 darts. The top five check outs are shown below:

170 t20, t20, bull. (Highest checkout possible.)

167 t20, t19, bull.

164 t20, t18, bull. (preferable to t19, t19, bull because it doesn't require two darts in one bed and a miss keeps the number even.)

161 t20, t17, bull.

160 t20, t20, d20.

More Info: www.mastersgames.com