Strategy points (or SP) can be earned during the game - for destroying enemy units, capturing cities and countries and getting medals. Apart from medals, for which you receive your SP immediately, all SP earned during the game are stored in the Scoreboard until your game ends - then you either receive half of your earned points if you lose (or surrender), all of your SP + half of your opponents' SP if you win and nothing at all if you quit.
If the game expires (reaches the set maximum game turns), the player with the highest SP wins.
SP can be spent on buying upgrades in the lobby. You also earn new ranks based on your total SP amount.