Example:
Standard 3p game, all players have 1000 points. Player A eliminates player B (at that moment, A has 1200, B has 900). A's score grows to 1400, B's score shrinks to 700, C's grows to 1050, then A wins the game...
Whether A gets
1) 20*1000/1000 + 20*1000/1000 = 20 + 20 = 40 points
or
2) 20*900/1200 + 20*1050/1400 = 15 + 15 = 30 points
or
3) 20*700/1400 + 20*1050/1400 = 10 + 15 = 25 points

I'm pretty sure that isn't 2), but I'm not sure whether it's 1) or 3)...
Please do not answer if you don't know for sure, I need a reliable information.