re: Poker & does this mean i need 2 fold more pairs on river ~?
That graph doesn't tell you anything about how you play pairs specifically. You're doing better in non-sd pots than showdown pots, but you're not getting clobbered at sd either. Typical for laggy players.
Filter your database for one pair hands and review your 1. showdown w one pair hands 2. non-sd w one pair hands. Look for big pots for both, and medium pots for both. See if there are common situations that occur when you lose at sd in particular - did you get c/r'd on the turn and shoved/called/whatever over a villain that you should've folded to? I'm not familiar w HU play, I'm sure there are other situations/patterns you can look at as well.