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Inbaseball andsoftball, thecount is the number ofballs and strikes thebatter has. If the count reaches three strikes, the batterstrikes out; if the count reaches four balls, the batter earns abase on balls (a "walk").
The count is usually announced as a pair of numbers, for example, 3–1 (pronounced as "three and one"), the number of balls followed by the number of strikes. Zero is almost always pronounced as "oh". The count is often used as adjective—an individualpitch may be referred to by the count prior to its delivery; for example, a pitch thrown on a 3–1 count is a "three-one pitch" or a "three-and-one pitch".[a]
A count of 0–0 is rarely stated; the count is typically not mentioned until at least one pitch has been thrown.[b] A count of 1–1 or 2–2 may be described aseven. A count of 3–2 isfull, which is discussed below.
The home plateumpire signals the count with the number of balls on the left hand, and the number of strikes on the right hand. (As a result, it reads backwards when viewed from thepitcher's point of view.) Individual umpires vary in how frequently they give this signal; it is often done as a reminder when there has been a slight delay between pitches, such as due to the batter stepping out of thebatter's box. It can also signal thescoreboard operator that the board shows an incorrect count. Some umpires may also call out the count, although usually only the batter andcatcher can hear it.
Baseball statistics measure which counts are most likely to produce favorable outcomes for the pitcher or the batter. Counts of 3–1 and 2–0 are considered advantageous to batters ("hitters' counts"), because the pitcher—faced with the possibility ofwalking the batter—is more likely to throw a ball in thestrike zone, particularly afastball. Counts with two strikes (except 3–2) are considered advantageous to pitchers ("pitchers' counts"). An 0–2 count is very favorable to a pitcher, who has the freedom to throw one or two pitches out of the strike zone intentionally, to get the batter to "chase" the pitch (swing at it), andstrike out.
A 3–0 count tends to yield fewer hittable pitches, perhaps because the umpire is reluctant to call four straight balls and may tolerate a fourth pitch that barely misses the strike zone. Batters often "take" (do not swing at) a 3–0 pitch, since the pitcher has missed the strike zone three straight times already, and a fourth would earn the batter a walk. This is a sound strategy because the batter is more likely to eventually reach base even if the count becomes 3–1 than he is if he puts the ball in play on 3–0.[1] It is sometimes also advantageous to take on 2–0 and 3–1.[1]

A 3–2 count is called afull count and the ensuing pitch is called a "payoff pitch", since a mistake by either the pitcher or the batter ends theplate appearance. The payoff pitch is not necessarily the final pitch in the plate appearance, as a batter may maintain two strikes indefinitely by hittingfoul balls.[c]
The full count term may derive from older scoreboards, which had spaces (rather than numerals) to denote up to three balls and up to two strikes. Many scoreboards still use light bulbs for this purpose; thus a 3–2 count means that all the bulbs are lit. The alternate termfull house (more commonly used in softball) is inspired by thefull house hand inpoker, consisting ofthree of a kind and apair.
With two outs and a full count, any baserunners who might beforced out start to run toward the next base at the moment the pitcher begins to deliver the pitch. This is because either the batter will walk (awarding such runners the next base), strike out to end the inning, foul off the pitch (allowing runners to return to their original bases), or put the ball into play.
The full count was not always 3–2, and went through an evolution in the 1870s and 1880s, seeing a gradual reduction in balls allowed before abases on balls was called. Prior to1901, fouls were not counted as strikes (though foul bunts were, onwards from1894).[2][3]
| Year | Full count | Notes |
|---|---|---|
| 1871–1874 | 2–2 | Balls only called on pitches in dirt, behind batter, etc., considered "unfair balls". |
| 1875[4]–1879 | 8–2 | Every pitch must be called a ball, strike, or foul. |
| 1880–1881 | 7–2 | |
| 1882–1883 | 6–2 | |
| 1884–1885 | 5–2 (NL) 6–2 (AA) | |
| 1886 | 6–2 (NL) 5–2 (AA) | |
| 1887 | 4–3 | |
| 1888 | 4–2 | |
| 1889–present | 3–2 |