Rack (billiards) Totally Explained

A rack is the name given to a frame (usually wood or plastic) used to organize billiard balls at the beginning of a game. Rack may also be used as a verb to describe the act of setting billiard balls in starting position in billiards games (usually, but not always, using a physical rack), as well as a noun to describe the balls in that starting position. The most common shape of a physical rack is that of a triangle, with the ball pattern of 5-4-3-2-1. Racks are sometimes called simply "triangles" (most often by amateur shooters) based on the predominance of this form. Triangular-shaped racks are used for eight-ball, straight pool, one-pocket, bank pool, snooker and many other games. Although diamond-shaped racks, with an intended pattern of 1-2-3-2-1, are made for the game of nine-ball, the triangular rack is more often employed in nine ball as well.

Racking in specific billiards games

Eight-ball

In eight-ball, fifteen object balls are used. Under the Billiard Congress of America's World Standardized Rules: 8-Ball

it's prescribed that:

The 8 ball must be in the center of the rack (the second ball in the three balls wide row).
The first ball (traditionally but not mandatorily the 1 ball) must be placed at the apex position (front of the rack and so the center of that ball is directly over the table's ).
The two corner balls must be a stripe and a solid. In theory, this pattern allows for a more equal chance of sinking both a solid and a stripe because the two corner balls are the most likely balls to be pocketed on the break.
All balls other than the 8 ball are placed at random, but in conformance with the preceding corner ball rule.
The balls should be pressed tightly together without gaps, as this allows the best break possible.

In amateur eight-ball play, in contradistinction to the official rules, a racking variant that's often followed is:

The outer edges of the triangle must be in the pattern of solid, stripe, solid, stripe, etc. (resulting in the two corner balls being either both stripes or both solids).

Sometimes, the balls must be placed in numeric order from the top of the triangle down and from left to right, for example, the 1 on the foot spot, followed by the 2 then 3 in the second row, and so on. This always results in the corner balls of the rack being both stripes (the 11 and 15, respectively).

Nine-ball

In nine-ball, the basic principles are the same as detailed in the eight-ball section above, but only balls 1 through 9 are used; the 1 ball is always placed at the rack's apex (because in nine-ball every legal shot, including the break, must strike the lowest numbered ball first) over the table's foot spot, and the 9 ball is placed in the center of the rack.
Some players (most often amateurs) place the balls in numeric order but for the 9 ball; from the top of the triangle down and from left to right, for example, the 1 on the foot spot, followed by the 2 then 3 in the second row, and so on. However, all balls other than the 1 and 9 may be randomly placed. Note that racking in numeric order in nine-ball, unlike in eight-ball, doesn't result in a contravention of the official rules.
In nine-ball games where a is given by one player being, some tournament venues enforce a rule that the spotted ball must be racked as one of the two balls in the row directly behind the 1 ball.

Straight pool (14.1 continuous)

In the initial rack in straight pool, fifteen balls are racked in a triangular rack, with the center of the apex ball placed over the foot spot; the 1 ball is placed on the rack’s right corner, and the 5 ball on left corner from the racker's vantage point. This rule developed because the color and pattern of the 1 and 5 balls are thought to provide maximum contrast with the end rails and are the balls targeted on straight pool's exacting standard break. All other balls are placed at random.
   Straight pool is played to a specific number of points agreed on prior to the match's start, with each pocketed ball being worth one point to the shooter. Because the game is played to a number of points normally far in excess of the fifteen points total available in the initial rack (in tournament play, one-hundred fifty points), multiple intergame racks are necessary. Intergame racking employs a separate set of rules from those in place at the game's start.
   After the initial rack, the balls are played until only the cue ball and one object ball remain on the table's surface. At that time, the fourteen pocketed balls are racked with no apex ball, and the rack is so placed so that if the apex ball were in the rack, its center would rest directly over the table's foot spot. Play then continues with the cue ball shot from where it rested and the fifteenth ball from where it rested prior to racking.
   A number of rules have developed which detail what must be done when one or both of the cue ball and fifteenth object ball are either in the rack area at the time an intergame rack is necessary, or are in such close proximity to the intergame racking area, that the physical rack can't be used without moving the one or the other. The rules also vary depending on whether the cue ball or fifteenth ball are resting on the table's head spot. Such rules are detailed on the following chart (note therein that the refers to the area behind the table's ).

15th ball lies	Cue ball lies
15th ball lies	In the Rack	Not in the Rack and not on the Head Spot	On The Head Spot
In The Rack	15th ball: foot spot Cue Ball: in kitchen	15th ball: head spot Cue Ball: in position	15th ball: center spot Cue Ball: in position
Pocketed	15th ball: foot spot Cue Ball: in kitchen	15th ball: foot spot Cue Ball: in position	15th ball: foot spot Cue Ball: in position
Behind Head String, but not on Head Spot	15th ball: in position Cue Ball: head spot
Not behind Head String, and not in the Rack	15th ball: in position Cue Ball: in kitchen
On Head Spot	15th ball: in position Cue Ball: center spot

One-pocket and bank pool

In both one-pocket and bank pool all fifteen object balls balls are racked entirely at random, with the center of the apex ball placed directly over the foot spot.

Snooker

Snooker is a cue sport that's played on a large (12' × 6') table. It is played using a cue stick, one white ball (the cue ball), fifteen red balls and six colours: a yellow (worth two points), green (three points), brown (four points), blue (five points), pink (six points) and black ball (seven points). At one end of the table (the "baulk end" ) is the so-called, which is 29 inches from the baulk end cushion. A semicircle of radius 11.5 inches, called, is drawn behind this line, centred on the middle of the line.
   On the baulk line, looking up the table from the 'baulk end', the yellow ball is located where the "D" meets the line on the right, the green ball where the "D" meets the line on the left, and the brown ball in the middle of the line. An easy way to remember these positions is with the mnemonic, 'God Bless You', with the first letter of each word being the first letter of the three colours as they're racked from left to right on the baulk line. At the exact middle of the table sits the blue ball. Further up the table is the pink ball, which sits midway between the blue spot and the top cushion, followed by the red balls (one each), placed in a tightly-packed triangle behind the pink. The apex must be as close as possible to the pink ball without touching it. Finally, the black ball is placed on a spot 12.75 inches from the top cushion.
   Coloured ball racking positions must be remembered with care, as each time a coloured ball is potted, it's immediately replaced to its starting position, which occurs multiple times per frame, whereas reds are not returned to the table's surface after being potted.
   If the starting position spot for a coloured ball is covered by another ball, the ball is placed on the highest available spot. If there's no available spot, it's placed as close to its own spot as possible in a direct line between that spot and the top (black end) cushion, without touching another ball. If there's no room this side of the spot, it'll be placed as close to the spot as possible in a straight line towards the bottom cushion, without touching another ball.

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