Google results:
30,100 for "Possible Poker" -most of these are from the phrase "possible poker HANDS"
2,120 for "Possibly Poker"
The 2 words don't really make sense together, not a common 2 word phrase. Being that the net, org & info were all available as well should tell you something.
If you are looking for poker domains look to find something that could have potential end-user appeal, i.e. (adjective+poker), cosmicpoker, classypoker, partypoker etc etc. Would you ever say, "Hey I'm going over to possiblypoker.com to play in their midnight tournament?" Does not quite have that ring capiche?
reg fee for both in my opinion.
I would at the least refund the extra net, org & info
best of luck