Thursday, April 16, 2009

Cue sports techniques

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Illustration from Michael Phelan's 1859 book, The Game of Billiards
Cue sports techniques (usually more specific, e.g., billiards techniques, snooker techniques) are an immensely important aspect of game play in the various cue sports such as carom billiards, pool, snooker and other games. Such techniques are used on each shot in an attempt to achieve an immediate aim such as scoring or playing a safety, while at the same time exercising control over the positioning of the cue ball and often the object balls for the next shot or inning.
In carom games, an advanced player's aim on most shots is to leave the cue ball and the object balls in position such that the next shot is of a less difficult variety to make the requisite carom, and so that the next shot is in position to be manipulated in turn for yet another shot; ad infinitum.
Similarly, in many pocket billiards games, an advanced player's aim is to manipulate the cue ball so that it is in position to pocket (pot) a chosen next object ball and so that that next shot can also be manipulated for the next shot, and so on. Whereas in the carom games, manipulation of the object ball's position is crucial as well on every shot, in some pool games this is not as large a factor because on a successful shot the object ball is pocketed. However, many shots in one-pocket, for example, have this same added object ball control factor for most shots.
If a player is not attempting to score or pocket, depending on the game, then the goal is usually to exercise control over the cue ball to leave some type of safety to make it more difficult for the opponent to score or pocket.
In order to control the cue ball on a shot, a player must master a wide variety of techniques, and have a well-founded conceptual grasp of the mechanics involved. As stated by George Fels, "pool's poet laureate":[1]
The mere pocketing of a ball isn't that hard; in fact, it's relatively simple. What drives many, many players to distraction is the unpredictability of the cueball's path of travel...the game of billiards requires you to drive a ball someplace; pool, in any form, mostly asks you to stop a ball someplace. In either case, you'll fare much better when you understand the how and why of a ball's getting from one place to another.[1]
Contents
1 Sidespin (english)
2 Follow
2.1 Force-follow
3 Draw
4 Slide
4.1 The stop and stun shots
4.2 The tangent line
5 Throw
6 The semi-mass ("curve" or "swerve") shot
7 The mass shot
8 Swerve effect
9 Deflection (squirt)
10 The jump shot
11 References
//
Sidespin (english)

The Night Cafe (1888), by Vincent van Gogh, showing a pocketless carom table
The term english (called "side" in the UK, and sometimes simply called "left" or "right", and sometimes "check side" for left-hand side, and "running side" for right-hand side) normally refers to sidespin put on a cue ball by hitting it to the left or right of center. Generally, English is used to change the angle of reflection of the cue ball after it contacts a rail. English also affects the direction an object ball takes on impact (the "throw" effect), as well as the path of travel of the cue ball after impact with a cue ("deflection" or "squirt").
Sometimes English is conflated to refer as well to spin imparted on the vertical axis of the cue ball. However, an above center hit is more precisely referred to as 'follow,' ('top' in the UK) and a below center hit, as 'draw' ('screw' or 'back spin' in the UK). Any time the cue ball is not struck directly in the center, some spin will be imparted, whether left or right English, follow or draw. Unintentional sidespin is a common source of missed shots. Spin is not always placed on the cue ball by the shooter; spin is naturally imparted to the cue ball from contact with pool cloth on the bed of the table and on the table's cushions.
Follow
Follow, sometimes called top spin or simply "top," is spin in the direction of travel of the cue ball, such that it is spinning faster than it would from its natural roll. If the cue ball has top spin on it, it will resume rolling forward after making contact dead-on with the object ball and "follow" the object ball rather than stopping abruptly.
Top spin is imparted to a ball by hitting it above the midpoint of its vertical plane as it faces the shooter. Top spin is spin in the direction a ball naturally "wants" to take in reaction to friction from contact with the pool cloth. Because of this, a ball sliding on the cloth will rapidly pick up follow. Likewise, a ball struck so that it is spinning backwards (with draw see below) immediately starts losing that spin, and if it travels far enough, will reach a sliding point (no spin), soon graduating to natural follow.
Follow applied to a non-dead-on shot will cause...(and so on)

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