# EXR

The tiebreaker EXR stands for *Exploits Reussis* (difficulties overcome). Its idea is to measure the difficulty of the games played by one player. It is used in OpenGotha

We take **AH**, the actual number of handicap stones used.
We take **NH**, the natural number of handicap stones.
Then we calculate the co-efficient (**C**) for each won game via the following rules.

- if AH < NH then C = 0
- if AH = NH then C = 1
- if AH = NH + 1 then C = 2
- if AH >= NH + 2 then C = 3

**EXR** is then ,for victories only, the sum of: C times the SOS of the opponent.

See also EXT