$50 NL, 99 on 323r flop my check/raise gets called

[A_C_Slater]

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($50.70)
BB ($90.45)
UTG ($50)
MP ($63.60)
CO ($74.70)
Button ($48.45)

Preflop: Hero is SB with 9[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/heart.gif[/img]. CO posts a blind of $0.75.
<font color="#666666">2 folds</font>, <font color="#CC3333">CO (poster) raises to $2</font>, <font color="#666666">1 fold</font>, Hero calls $1.75, <font color="#666666">1 fold</font>.

Flop: ($4.75) 3[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">CO bets $4.5</font>, <font color="#CC3333">Hero raises to $13.5</font>, CO calls $9.

Turn: ($31.75) 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, <font color="#CC3333">CO raises to $40</font>, Hero calls $15.20 (All-In).

River: ($106.95) T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players, 1 all-in)</font>

Final Pot: $106.95


Is it standard to check/raise med overpairs on flops like this one? It may look like I am check/raising with air on flops like this one to my opponent and his subsequent calls or reraise makes it harder to discern the strength of his hand.

I am commited on the turn when the pot is about the size of my remaining stack, yes?

[Jigsaws]

Check-call is superior to check-raising. Check-raising only folds out worse hands, better hands call.

[higher_energy]

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Check-call is superior to check-raising. Check-raising only folds out worse hands, better hands call.

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as well as draws, med and bottom paris ...have fun playing turn and river

[Imrahil]

[ QUOTE ]
[ QUOTE ]
Check-call is superior to check-raising. Check-raising only folds out worse hands, better hands call.

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as well as draws, med and bottom paris ...have fun playing turn and river

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There are a LOT of draws possible on that board. Villain could easily have 54 so definitely DON'T give a free card of any sort. Building a big pot on the flop will really help you play the turn and river easier.

[Genz]

I check/call the flop and lead the turn. You have no fold equity here if villain has any hand at all.

As played: lead the turn with a push. By leaving 15 behind, you are commited to the pot and betting the whole 35 would be only a slight overbet and maximizes fold equity.