Official Rileys' rules of play for Snooker.

The object of the game is to score more points than your opponent in each frame.

Points are built up by potting a red followed by a colour of your choice, the colour ball must be placed back on its original spot.

The picture below explains the positioning and value of each ball on the table.

1pt = Red 2pts = Yellow 3pts = Green 4pts = Brown 5pts = Blue 6pts = Pink 7pts = Black

When all 15 reds have been cleared from the table, a player must pot the colours in order or value - lowest first. Yellow, green, brown, blue, pink, black.

It is also possible to accumulate points when your opponent fouls. The following shots are classified as foul strokes. A foul is no lower than 4 points and no higher than 7 (this depends on which colour ball you have pocketed. If you pot the yellow or green by mistake these count as 4pts)

• A miss is when the cue-ball fails to first contact a ball on and the referee considers that the striker has not made a good enough attempt to hit a ball on
• Potting a ball which you are not supposed to hit
• If the cue-ball passes over any part of an object ball, whether touching it in the process or not, or leaves the table
• Potting the cue ball
• Pushing the cue ball against another ball that is in close proximity
• Causing the cue to touch the white more than once

If a frame is tied then the players must play a black ball game - whoever pots the black is declared the winner

These are by necessity a summary of the rules. For the official rules, please visit the worldsnooker site