1, break away from lane first before arriving at ball bottle when the ball, next the ball bottle with knockdown ability.

2, the ball of pitching rebounds from hind dead block come back knockdown ball bottle.

3, any place that contact body of the member that place bottle when bottle rebound come back knockdown ball bottle.

4, be placed automatically bottle implement the bottle that touchs.

5, keeping clear of the bottle that is touched when bottle.

6, the bottle that be placed member the bottle that touchs.

7, the knockdown bottle after the athlete fouls.

8, after dropping a ball, mix in lane bottle appears in edge channel, the ball touchs bottle before leaving lane outside.

Once bottle of illegimate knockdown ball appears, should restore former. The athlete has authority to drop another ball in this case.