Good Bluff or spew? 200NL

[Deanglow]

Villain seems like a good TAG. We had one hand previous to this where I raised BU with Q9s, he calls in BB. He checkraised the 2h6x9h flop (I called), checked a heart turn, and bet 3/4pot on river(I folded). I've been playing pretty TAG, raising maybe 6-8 hands in 5 orbits. Don't know how he got his stack.
What do you think? River bet size OK?

PokerStars No-Limit Hold'em, $2 BB (8 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($250.75)
Hero ($210.05)
Button ($158.45)
SB ($423.70)
BB ($80)
UTG ($176)
UTG+1 ($197)
MP1 ($247.10)

Preflop: Hero is CO with A, J. UTG posts a blind of $3.
UTG (poster) checks, 3 folds, Hero raises to $10, 1 fold, SB calls $9, 1 fold, UTG folds.

Flop: ($25) T, 5, Q (2 players)
SB checks, Hero checks.

Turn: ($25) 9 (2 players)
SB bets $16, Hero calls $16.

River: ($57) 4 (2 players)
SB bets $33, Hero raises to $98

[Warpe]

Why aren't we c-betting the flop?

[Deanglow]

"why check flop?"

1 To vary my play
2 Last time I bet flop against him he checkraised
3 turn helps a lot

[XTR1000]

Without betting flop/raising turn you are representing the rr flush, which is a tough sell. With a str8/set u´d probably have raised the turn given two fd´s, AQ/KK/AA would have bet flop.

raising 7 hands in 5 orbits is a pfr <10% and most of the diamond sc´s in your range would have either caught something or appeared on the board.

Since villian leads two streets into you on a scary board he has a hand here a good percent of the time and you´re offering him roughly even money on his river call. This may get him off AQ, the majority of his holdings will call.

[Warpe]

2 Last time I bet flop against him he checkraised

That's what I thought you'd say. Funny how c/r'ing slows down aggressive opps, isn't it?

I like it if you think he'll credit you with the straight, less so the bd flush, but there's definitely enough uncertainty for a tight player to fold AQ/KQ here, that's for sure.

I don't do this often enough though, so I'll see what the FTR laggroballas think.

[Warpe]

With a str8/set u´d probably have raised the turn given two fd´s...

I was thinking this as well.

[Deanglow]

With a str8/set u´d probably have raised the turn given two fd´s...

I was thinking this as well.

I thought I was representing the BD flush. At least that is what would make most sense (for not raising turn, checking flop).