What is MR15 in CS2?
MR15 was the standard CS:GO format from 2012 through the CS2 transition. Teams played 15 rounds per side for a 30-round regulation match; first to 16 rounds won. The format produced iconic scorelines (16-14, 16-7) and was the baseline for almost all recorded historical data. CS2 moved to MR12 to keep matches playable within tighter TV windows and reduce viewer drop-off. Analytically, MR15 stats don't map cleanly onto MR12 without adjustment — a player's per-match kill total naturally drops ~20% in MR12 because there are fewer rounds, so longitudinal comparisons need to normalise per-round.
Related terms
More match format & rules terms
Bo3
Bo3 ("best of three") is a match format where teams play up to three maps, with the first team to…
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,…
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…
