If nett double bogey is 6 then the calc is correct, if nett double bogey is 5, then he should've been cut by another 0.3. I'd be surprised if a par 3 is SI 1 or 2...
I played at MadAdeys course and I'm pretty sure they had a par3 index 2, it might not be common but their certainly out their! Most likely though its a 6-5 for 0 removing 2 extra shots from his 7.
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