A good knowledge of snooker table angles is imperative in laying (and escaping from) snookers and such knowledge can only be gained by experience. A helpful practice routine is to set the balls up as at the start of a frame, place the cue-ball touching the green and try to hit the pack of reds, using a 4-cushion escape, striking the side cushion (behind the yellow) about a foot behind the baulk line. Studying the route of the cue-ball will improve angle recognition. Practice from behind yellow and brown, too.
Safety near the Baulk Cushion
In order to lay snookers successfully, a player must be able to judge the thickness of contact and pace of shot required to strike the pack of reds and return the cue-ball to safety in the baulk area. At worst, an opponent will be left with a tricky shot from long range or a snooker behind the baulk colours.
Positional Play
The value of a straightforward pot should never be underestimated, as it allows concentration on the positional aspect. Practicing simple pots and playing position with screw, side, stun and top will enable a player to send the cue-ball to any point on the table. This will allow continuation of a break or laying a difficult snooker. Recognition of certain angles will become automatic, as will memory as to how to strike the cue-ball correctly, enabling complicated positional shots (including snookers) to be readily achieved.
Shots to Nothing
The "shot to nothing," involves the combination of an attempted pot and safety. Often, when the reds are tightly grouped, there is an odd ball towards the bottom of the pack that will pot into a corner pocket. Novice players instinctively tend to play a thin contact on a red, returning the cue-ball to safety at the baulk end, with no thought of a pot. However, the shot to nothing approach is to attempt to pot the ball, whilst still attaining safety, or a snooker behind the baulk colours. The advantages of this type of shot are three-fold; if the pot is successful, it may be the start of a break or leave a simple snooker behind a baulk colour. If the pot misses, the opponent is left safe or snookered. Furthermore, the only ball that can possibly be left on is the one played. This more attacking approach to safety play / snookering often pays dividends. 
"Chinese" Snookers
Assume that from a widely spread pack of reds, a player has potted one, but the cue ball has come to rest in the area of "no man's land" between the blue and pink. In this situation, a so-called "Chinese" snooker may create severe problems for an opponent. This "snooker" can be achieved by gently rolling up to the blue, leaving the cue-ball as close as possible. The opponent will need to use the "spider" to play over the blue. Striking down on the white makes clipping off a red difficult and any attempt at potting a red equally tricky.
The critical point to remember when attempting to lay a snooker is that the opponent's task should be as difficult as possible. 
Read more tips on Pool Table World
Image Credit: Khino Pizzato
