How many balk calls are there?

Answer 1

There is only one call for a balk. When a pitcher is in the stretch and a runner or runners are on base, the pitcher must pause before throwing to homeplate. There can also be a balk called on the pitcher if he makes a move to throw out someone at first base, but doesn't actually throw the ball. (No fake throws to first allowed!) The last reason for a balk to be called is if a pitcher begins to move his front leg towards homeplate, but does not throw the ball to home. (Or simply pitch to the batter).

A balk results in baserunners advancing one base.