[jdunford]

Originally Posted by DocNeptun

Hi,
while playing limited hold'em on pokerstars.net i lost a really big bet.. i still can't believe it happened... I decided to play [A 9] from middle position, i raised, which drove out all players except one in the BB (which i estimated as "loose-agressive")... I flopped top-pair with [4 A Q] and there was "heavy betting". The Turn brought [2], so i still held top pair and had a flush draw. The nutflush came through the backdoor on the River [6], so i went on betting, confident that i held the best possible hand... But in the end, I lost the pot against [K 10] because BB had the higher hole-card!

That's standard poker rules. There's no tie unless you have identical hands. His hand was A10642, which beats your A9642. In this case, a player with the nut flush has K, since A belongs to the community.