In Search and Destroy, one side tries to plant the bomb and the other defends. If the defenders defuse a planted bomb, they win that round. The round adds one to their map score. A pick on the series winner can stay open long after that map ends.
For a single map, add the rounds won by both teams on that map. Check whether the market includes overtime before using an extended scoreline.
Yes. In a best of three, losing the series 1-2 still covers +1.5. Losing both opening maps gives a 0-2 final and falls outside that line.
More sports: Counter-Strike, Valorant.