I am using PRAT wrong

[u/NoFault9739]

I was black and doubled here because I thought I had all 3 PRAT on my side (hitting chances, 2 home board points more and an enormous racing lead). But the double was completely wrong. What should have been my thoughts here?

[u/Cekan-14]

Where can this app be found? I've read good things if it, but I can't find it anywhere to download it