Referees & rules

Snooker is played with 15 reds, 6 colours and the white cue ball. A player pots a red, then a colour, alternately, until all reds are gone; then the colours in order: yellow, green, brown, blue, pink, black.

A frame is won by the player with more points when the last ball is potted, or when the opponent concedes. The maximum break is 147.

A foul gives the opponent at least 4 points, or the value of the ball involved if higher. Common fouls include missing all balls, potting the cue ball and hitting the wrong ball first.

After a foul the next player may play, or ask the offender to play again.

If a player is snookered after a foul, the referee can call a free ball. Any ball may then be nominated and played as if it were the ball on.

If the referee judges that a player has not made a good enough attempt to hit the ball on, a miss is called and the opponent may have the balls replaced.

SBI events follow the WPBSA Official Rules, plus the SBI Tournament Regulations for entries, dress code, walkovers and appeals.