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MLB rules quiz

Check innings, outs and the ball-and-strike count against MLB’s linked official rules.

Writer: Ian St. ClairEditor: Mike Epifani

Scope: 2025 Official Baseball Rules linked by MLB; source edition shown. Checked 2026-11-05; the score carries no reward.

1. How many offensive outs normally end a half-inning?
2. How many called balls entitle a batter to first base in a conventional walk?
3. How many innings form the usual regulation game?
4. With a third strike legally caught by the catcher, what happens to the batter?

MLB rules quiz: answers and rule references

Show all 4 answers

  1. How many offensive outs normally end a half-inning?

    Answer: Three. After three offensive players are put out, the teams exchange roles.

    Official rule 5.09(e) · source checked 2026-11-05

  2. How many called balls entitle a batter to first base in a conventional walk?

    Answer: Four. Four balls entitle the batter to first base. The rules also provide intentional-walk procedures.

    Official rule 5.05(b)(1) · source checked 2026-11-05

  3. How many innings form the usual regulation game?

    Answer: Nine. The rulebook sets nine innings, with stated provisions for shortened games and extra innings.

    Official rule 7.01(a) · source checked 2026-11-05

  4. With a third strike legally caught by the catcher, what happens to the batter?

    Answer: The batter is out. A caught third strike retires the batter. An uncaught third strike has separate conditions.

    Official rule 5.09(a)(2), 9.15(a)(1) · source checked 2026-11-05

Sources and scope

Checked November 5, 2026.

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