Just a Slowplay

Feels like a good spot to me because it’s plausible that I’m giving up with some trash that I 3-bet, most of the hands that I could stack with a  bet-bet-bet line will value bet for me anyway, and there’s a very plausible way for lesser hands to make something second-best. The only drawback is that if I start showing interest on the turn or river after checking the flop, it looks suspicious.

Full Tilt No-Limit Hold’em, $6.00 BB (6 handed) – Full-Tilt Converter Tool from FlopTurnRiver.com

UTG ($819.10)
MP ($600)
CO ($246)
Button ($486.85)
SB ($1083.60)
Hero (BB) ($1609.45)

Preflop: Hero is BB with A, A
1 fold, MP bets $21, 3 folds, Hero raises to $72, MP calls $51

Flop: ($147) 8, 8, 8 (2 players)
Hero checks, MP bets $60, Hero calls $60

Turn: ($267) 4 (2 players)
Hero checks, MP checks

River: ($267) 9 (2 players)
Hero checks, MP bets $156, Hero raises to $1477.45 (All-In), 1 fold

Total pot: $579 | Rake: $3

Results:
Hero didn’t show A, A (nothing).
Outcome: Hero won $576

My best guess is he had some sort of mediumish pair that tried to go for thin value but figured out what was going on when I check-shoved the river. I doubt I would have won more from such a hand by betting flop.