5/10 Fixed-Limit Hold'em (5 handed)
Hand recorder used for this poker hand: Texas Grabem 1.9 by www.pokerstrategy.com.
Preflop: Hero is SB with A♠, A♥
MP3 calls, CO folds, BU raises, Hero 3-bets, BB caps, MP3 calls, BU calls, Hero calls.
Flop: (16.00 SB) A♣, 5♦, K♦ (4 players)
Hero checks, BB bets, MP3 raises, BU folds, Hero 3-bets, BB calls, MP3 calls.
Turn: (12.50 BB) K♥ (3 players)
Hero bets, BB raises, MP3 calls, Hero 3-bets, BB caps, MP3 calls, Hero calls.
River: (24.50 BB) 6♦ (3 players)
Hero checks, BB bets, MP3 raises, Hero calls, BB 3-bets, MP3 calls, Hero folds.
Final Pot: 32.50 BB
Results follow (highlight to see):
BB shows [ Kc, Ks ] four of a kind, Kings
MP3 shows [ 8d, 9d ] a flush, King high
BB wins $323 USD with four of a kind, Kings.
I guess not. 
3-bet turn because he has AK or KK 50% of the time and with MP3 it's +EV.
Couldn't fold to the raise on the river as MP3 was able to raise a flush here.
He would never 3-bet the river with AK here. And I expected to see a cap and clicked to fast to fold too.
K :spade:...
K :club:, A 
K :club:) for a split and only 1 combo of AA (A :diamond:, A :heart:), so he splits 67%. After the double turn call, it's obvious MP3 has the flush, and after your river call, he may think you don't have AA, and 3-bets to get more out of MP3.
