passed pawn but cant win

thus is a game i played against rybka i am white but after 75 moves i gave up every time i foung my king on h8 black just forked my pawn and just kept on checking me every time i was not in check the pawn was forked this is very tricky position and needs a lot of skill i think can anyone find the answer  .... white to move

It's a draw, no way to win for White against good defense.

I can't find a way to win this, although queen endgames are notoriously difficult to analyze. Still, if you're playing against Rybka I find it highly unlikely that you can force a win even if a winning line existed...it should be able to easily avoid a queen exchange and keep spamming checks on you in this position. I mean, it can easily see any means you have to force a queen exchange (pins, skewers, forks or cross-checks are the ones I can figure) a few moves in advance, so you'd fail if you deviated even slightly from the winning line (assuming one exists).