Ours: race impact, the chances, the finishes and Elo, from our forecast of 1 October (how our Elo is scored). Valve's: the standings and the event weight.
Race impact is how many points of Major chance the event is expected to move, summed over the teams in the race.
Event weight is the prize pool through Valve's curve. A stage or qualifier also takes half the pool of each finished event it feeds.
Points are our reckoning until Valve's next release: every team's points on 27 September, worked out with the event and without it. The difference is the event's alone. Every match counts as Ranked; Valve may not count them all.
The whole method: the model, its sources, how well it has done and what it cannot see.