# EXT

The tiebreaker EXT stands for *Exploits Tentes* (difficulty faced). 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 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

**EXT** is then the sum of: C times the SOS of the opponent.

See also EXR

The exact definition of AH is needed. I imagine that by default if a 3kyu plays a 4kyu, then AH has the value of 1.

Each SOS is the score at tournament end.