why would i very deliberately bet that amount instead of the pot?

it has something to do with how much i left him with on the river.

doing this never occurred to me before, what you guys think? good? or should i just be bashing him over the head with the pot?

Full Tilt Poker
Pot Limit Omaha Hi/Lo Ring game
Blinds: $0.50/$1
6 players
Converter

Stack sizes:
UTG: $73.25
Hero: $94.50
CO: $39.55
Button: $167.85
SB: $25.30
BB: $151.80

Pre-flop: (6 players) Hero is UTG+1 with 2 3 J 6
UTG calls, Hero calls, CO calls, Button calls, SB calls, BB checks.

Flop: 6 7 A ($6, 6 players)
SB checks, BB bets $1, UTG calls, Hero raises to $10, 4 folds, UTG calls.

Turn: T ($27, 2 players)
UTG checks, Hero bets $20, UTG calls.

River: 9 ($67, 2 players)
UTG checks, Hero is all-in $63.5

it's a good bet if you don't want him to call the river but want value on the turn. if you wanted a call on the river, bet more on the turn, obv.

by betting less on the turn it allows you to make a pot size bet on the end which unless he hits the nutz or has at lest 23 also it's gonna be very hard for him to call. I like it nice hand sir