There's interesting metagame theory here... It should get more aggressive whenever it's behind its goal rank in the tournament.
You can often trade variance for performance in competing strategies. The amount you're trading depends on your opponent's skill and strategy.
If an engine has a way to learn the skill of its opponent, that might be another way to determine the ideal level of aggressiveness too. Also if you're behind in a game, cranking variance is often your best shot.
Do any engines metagame yet? That could make things crazy.
You can often trade variance for performance in competing strategies. The amount you're trading depends on your opponent's skill and strategy.
If an engine has a way to learn the skill of its opponent, that might be another way to determine the ideal level of aggressiveness too. Also if you're behind in a game, cranking variance is often your best shot.
Do any engines metagame yet? That could make things crazy.