From OHSAA Rules. Scrimmages are limited to 4 scrimmages or 3 scrimmages and 1 preview. Why would you play a limited inning preview?
See below:
B. SPECIFIC REGULATIONS - Grades 9-12
1) Coaching and instruction may begin - March 9, 2009.
NOTE: Pitching and catching candidates may begin throwing with pitching instruction
two weeks prior to this starting date - February 23, 2009.
2) First game - March 30, 2009.
3) Deadline date for OHSAA Tournament - April 27, 2009.
4) Tournament seed/drawing meeting - May 3, 2009.
5) Coaching and Season end - June 13, 2009.
6) Scrimmages or Previews - Maximum of four scrimmages or three scrimmages and one
preview. Any contest played in a non-contiguous state must count as a game.