Poker stars, $5 + $0.50 NL Hold'em Tournament, 300/600 Blinds, 50 Ante, 9 Players

LottoMartin (UTG+2): 16,105
Loomis76 (MP1): 8,290
S.J.Plankton (MP2): 30,801
gaelic12 (CO): 12,338
cabernetwino (BTN): 9,535
OMGsuperstaR (SB): 34,697
boardrider68 (BB): 10,275
voigter (UTG): 3,790
BRedd81 (UTG+1): 22,900

Pre-Flop: (1,350) Qc Ac dealt to S.J.Plankton (MP2)
2 folds, LottoMartin raises to 1,288, Loomis76 folds, S.J.Plankton calls 1,288, 4 folds

Flop: (3,926) 6c Jd 8d (2 Players)
LottoMartin checks, S.J.Plankton checks

Turn: (3,926) Qs (2 Players)
LottoMartin bets 1,876, S.J.Plankton calls 1,876

River: (7,678) 4h (2 Players)
LottoMartin checks, S.J.Plankton bets 3,500, LottoMartin raises to 12,891 and is All-In, S.J.Plankton ???

LottoMartin is a regular who up until about a month ago was a break even ish player. Then he went on some kinda sick sick heater, so I guess he must be pretty good.

I had been pretty active stealing a lot without getting played back at. Lotto had been pretty tight. I considered 3-bet calling for value but decided to play the pot in position.

FLOP: I checked back the flop. I'm not sure its always the case, but when a good player checks back the flop with that stack size, I'm expecting to get checked raised if I make a stab at the pot with most of his range.

TURN: I certainly am not folding once I make TPTK.

RIVER: Once its checked back to me... I usually don't miss a value bet with TPTK. Can I really fold on the river check raise?