H stands for Hold'em
O for Omaha Eight or Better (i.e. Omaha hi-low (split-8 or better) , or simply Omaha/8 )
, 👍 or simply ) S for 7 Card Stud
E for 7 Card Stud Eight or Better
This form of poker is considered 👍 harder and not for beginners since it requires players to be skilled at many different forms of poker to succeed.[1] 👍 It is also commonly played at casino tables. Players must have a great deal of concentration as well to not 👍 confuse which game is being played.