The NCAA has no rules governing how many pitches a pitcher can throw in a game and how often he can pitch.
against the rules
Yes...and no. Under OBR Rules (those which also govern MLB) and under NCAA rules, as long as the pitcher steps directly to the base without beginning a motion associated with his pitching motion, it is legal to pick from the windup. Under FED Rules (High School), the pitcher must disengage first.
In most rules, once a pitcher is removed as pitcher, he may not return to the position of pitchers. Only certain leagues have by-laws that would allow this for a starting pitcher, let alone a reliever.
There is nothing I have found in the MLB rules that would prohibit a pitcher from a pitching motion similar to that of a softball pitcher. Actually, the underhanded motion was the rule when Alexander Cartwright came up with the rules of baseball in 1845. I have included a link, named 'MLB Rule 8', to the MLB rules concerning the pitcher on this page.
In the game of baseball the batter is the player who is at bat. There are many rules that the batter must follow. One of the most important rules is that the batter cannot leave his position in the batter's box once the pitcher comes to set position.
There is no limit in regards to how many innings a Starting Pitcher must pitch in the Major League Baseball All Star game, a team can be winning and the Starting Pitcher could pitch only 2 innings but because All Star games have different rules, they can be given the Win.
The basic gameplay rules are the same, but I'm sure there are certain managerial and coach rules that are different. I know that many little league coaches are not allowed to walk to the pitcher's mound. They have to stop at the foul line. I would assume there are slight changes in rules to NCAA as well, but nothing that would change the basic gameplay.
A relief pitcher can enter the game at any time or any count on the batter
In 1887, the rules were changed from 7 balls needed for a walk to 5 balls needed for a walk. In 1889, the rules were changed again to 4 balls needed for a walk and have stayed that way since.
Per Major League rules, if you pinch hit for any player, that player cannot return to the game in any position.In most youth league rules, such as USSSA, Pony, etc., starters can re-enter a game for the substitute that replaced them, but a pitcher, once removed as a pitcher, cannot pitch again in the same game.
That depends upon the size of the pitcher.