G.I.R.R - "Green in relative regulation" (or Net GIR)

Calculate GIR based on the number of shots allowed by your handicap.

So if you're an 18 handicap, you are allowed one extra shot per hole. That make GIRR on a par 4 hole "3", since 3 strokes +2 putts makes 5 - your Net Par.

It's a good stat, since it gives you a relevant stat compared to your handicap, not to a scratch player.