▁hand ▁or ▁the ▁index ▁finger ( s ). ▁ ▁Open / B et / R a ise ▁If ▁in ▁any ▁bet ting ▁round ▁it ▁is ▁a ▁player ' s ▁turn ▁to ▁act ▁and ▁the ▁action ▁is ▁un open ed , ▁then ▁the ▁player ▁can ▁open ▁action ▁in ▁a ▁bet ting ▁round ▁by ▁making ▁a ▁bet — the ▁act ▁of ▁making ▁the ▁first ▁volunt ary ▁bet ▁in ▁a ▁bet ting ▁round ▁is ▁called ▁opening ▁the ▁round . ▁On ▁the ▁first ▁bet ting ▁round , ▁it ▁is ▁also ▁called ▁opening ▁the ▁pot , ▁though ▁in ▁variants ▁where ▁blind ▁bet s ▁are ▁common , ▁the ▁blind ▁bet s ▁" open " ▁the ▁first ▁bet ting ▁round ▁and ▁other ▁players ▁call ▁and / or ▁raise ▁the ▁" big ▁blind " ▁bet . ▁Some ▁pok er ▁variations ▁have ▁special ▁rules ▁about ▁opening ▁a ▁round ▁that ▁may ▁not ▁apply ▁to ▁other ▁bet s . ▁For ▁example , ▁a ▁game ▁may ▁have ▁a ▁bet ting ▁structure ▁that ▁spec ifies ▁different ▁allow able ▁amounts ▁for ▁opening ▁than ▁for ▁other ▁bet s , ▁or ▁may ▁require ▁a ▁player ▁to ▁hold ▁certain ▁cards ▁( such ▁as ▁" J acks ▁or ▁better ") ▁to ▁open . ▁ ▁In ▁the ▁event ▁the ▁deal er ▁ex poses ▁the ▁turn ▁card ▁early , ▁the ▁natural ▁river ▁is ▁then ▁de alt ▁face ▁down . ▁The ▁exposed ▁turn ▁card ▁is ▁then ▁res h uff led ▁into ▁the ▁deck ▁and ▁the ▁turn ▁is ▁shown ▁without ▁a ▁burn ▁card . ▁▁ ▁In ▁the ▁event ▁the ▁river ▁is ▁prem ature ly ▁exposed