NL100 - Combo ante 3bet flop de desconocido

El short es 7/5/4

Del otro (el que mete la 3bet en el flop) ni una mano.

Grabbed by Holdem Manager

NL Holdem $1(BB) Replayer Game#22441824106

Hero ($100)

BB ($20)

UTG ($94.30)

UTG+1 ($41)

UTG+2 ($214.70)

MP1 ($20)

CO ($68.70)

BTN ($149.90)

Dealt to Hero A:club:4:club:

UTG call, fold, fold, fold, fold, fold, Hero call, BB check,

FLOP ($3) 9:club:3:club:2:spade:

Hero bets $2, BB raises to $6, UTG raises to $19, Hero ???