Great pitcher on the front lines of battle?, 12 letters
Have an ___ one's sleeve, 5 letters
Concealed advantage, 15 letters
Hidden asset, 15 letters
Hidden resource, 15 letters
It's surprising when played, 15 letters
Secret advantage, 15 letters
Secret weapon, 15 letters
Tactic held in reserve, 15 letters
Cheating maneuver (term that has entered general usage)*, 14 letters