There is a cheat in the melee section of SC3.
 Pressing ALT-F9 during a battle starts it over from the beginning,
 restoring the health of you AND your enemy and removing the planet
 (if there was one) in the process. There is a bug in SC3 that is
 to your advantage, kill an enemy and hit ALT-F9 while he's exploding.
 The battle will restart, your health and YOURS ONLY will be filled
 back up, and your enemy will die immediately.
 
 SUMMARY:
 Hit ALT-F9 while an enemy is dying to restore your health.
 
 Kevin Gadd,
 xSoft Interactive, CheatHak Division
 
 
 More cheats:
 
 Enter the following during gameplay:
 
 Result - Cheat
 Restore player 1 energy - Alt + F9 
 Restore player 2 energy - Alt + F10 
 Slower game - Alt + F1 or Alt + F2