What is a Bo3 in CS2?
Bo3 is the default playoff format for Tier-1 CS2 tournaments. Each team bans a map, picks a map, and the third decider is selected from the remaining pool. Bo3 rewards depth — a team with three strong maps usually beats a team with two strong maps because they can ban away one opponent pick and force a less-preferred decider. Bo3 matches are favoured for playoffs because the first map can be a toss-up and the format still surfaces the better team. Groups are typically Bo1 for schedule density; playoffs are Bo3 and grand finals are Bo5.
Related terms
More match format & rules terms
Bo5
Bo5 ("best of five") is a match format used almost exclusively for grand finals, where teams play up to five…
Map pool
The active duty pool is the set of 7 maps currently used in Tier-1 tournament play. Valve updates it periodically…
Map veto
Map veto is the pre-match pick/ban phase where teams alternately remove and pick maps from the active pool until the…
MR12
MR12 is the current competitive format in CS2: each half has 12 rounds, the first team to 13 rounds wins,…
MR15
MR15 was the CS:GO competitive format: each half had 15 rounds, first to 16 won, and OT was MR3. CS2…
Overtime
If a map is tied 12-12 at the end of regulation, it goes into overtime: a first-to-4-rounds-wins format played as…