What is MR12 in CS2?
MR12 was introduced in CS2 to shorten matches without sacrificing competitive integrity. The previous MR15 format (30 rounds total in regulation) was replaced with MR12 (24 rounds in regulation) because it reduced average match length by ~30 minutes while keeping the strategic depth of two halves plus economy. In MR12 each team plays 12 rounds on one side before switching sides; the first team to 13 rounds wins. Tied matches at 12-12 enter overtime played as MR3 (3 rounds per side, 6 rounds total per OT) until a team wins 4 OT rounds — so the final score of a dramatic OT map looks like 19-17 or 22-20, not 16-14 like it did in the MR15 days.
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…
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…
