If you want to use the standard tournament scenario win conditions, it goes a bit like this:
How to WinAlmost all games are decided based on comparing scores of
victory conditions in turn 3, and again in turn 4 if there is no winner. There are five conditions, and to win you need at least 2, and more than your enemy. For example 2-1 or 5-0.
If neither player has won by the end of turn 4, technically there is a possibility of a turn 5 but on the most part it comes down to counting up
victory points. These are basically:
half the points cost of a formation if it was down to half strength or broken
the full points cost if it was destroyed or it was both broken and half strength
Victory ConditionsThere are six objective markers, three on each side of the board including one on each player's baseline. The first three of the five victory conditions relate to control over these objectives:
Blitzkrieg: Hold the objective on the opponent's baseline.
Take and Hold: Hold two of the three objectives in the opponent's half (one of which can be the blitzkrieg objective).
Defend the Flag: Hold all three objectives in your own half.
They Shall Not Pass: There are no unbroken enemy units in your own half.
Break Their Spirit: Completely destroy the enemy's most expensive formation.
Tournament PointsThe UK tournaments have a system of combining the various factors into tournament points. That way you can have a common sliding-scale system that describes draws, outright victory condition wins, and wins where you basically annihilated the enemy but failed to actually achieve "victory".
The tournament rules are probably a
good place to start.