Majors - follow the LL 'Green' book rules. Drop 3rd strike is in effect & the infield fly rule.

If a player pitches 66 or more pitches in a day, four (4) calendar days of rest must be observed.
If a player pitches 51-65 pitches in a day, three (3) calendar days of rest must be observed.
If a player pitches 36-50 pitches in a day, two (2) calendar days of rest must be observed.
If a player pitches 21-35 pitches in a day, one (1) calendar day of rest must be observed.
If a player pitches 1-20 pitches in a day, no (0) calendar day of rest is required.

NOTE 1: Under no circumstance shall a player pitch in three (3) consecutive days.
NOTE 2: A pitcher’s pitch count for the purposes of day(s) rest threshold is determined by the first pitch thrown to a batter. The pitcher may not start a new batter once the limit imposed in Regulation VI(c) has been met.

If a player delivers 41 or more pitches, and is not covered under the threshold exception, the player may not play the position of catcher for the remainder of that day.

Threshold exception: If a pitcher reaches 40 pitches while facing a batter, the pitcher may continue to pitch, and maintain their eligibility to play the position of catcher for the remainder of that day