Originally Posted by
Fugazi Grrl
Ground Combat - Perception attribute test, TN 10, or Savvy reaction, same TN. Success means the character has accurately guestimated their opponent's next move and can "usurp" their initiative.
Space Combat can be handled one of two ways. If the CO, or officer in command has the Professional Ability, Anticipate Opposition, as described in the Starfleet Operations Manual (p. 35), giving a Starship Commander access to the abilities from a Diplomat with the same Pro. Ability (PG, p. 54), use this to give the Captain a chance to guess what his opposing commander will do next. Success allows the CO to usurp the initiative.
Another way to do it, and maybe simpler, would be a Tactics (Space), or Tactics (appropriate enemy) test with a TN 15. ie. if a ship is facing a Romulan Warbird Tactics (Romulans) would apply. Success would allow the Captain to usurp the initiative in that case.