The red, yellow and blue balls may exert an attractive force on each other, attempting to cluster together. This may well be the reason for balls appearing to curve off line on long shots. The second colours are in fact the anti colours. The force between the balls and their anti-coloured balls is even greater. Thus the balls seem to curve off line more when you are double banking on a lawn.
Double banking can be dangerous for the balls.
If a photon carrying enough energy was created, it could instantaneously create a croquet ball and its anti-ball. If you have enjoyed this site, please click here to Email Sam and tell him how much better my page is than his.