Sanhok outcomes are scaled by a factor of 0.5.
Rank Points you get from the match are divided in half and rounded to the next whole number.
Each elimination is still equal to 1 point.
Let's say you come in first place in Sanhok with 5 eliminations:
The Rank Points for getting first place is 15 in other maps, but in Sanhok this would be 15/2 = 7.5 = rounded to 8.
You would get a point for each elimination, so 5 Elimination Points.
Total points would be 8 + 5 = 13