Hand flags that may be relevant. Special characteristics about a hand that may be needed to fully understand the hand. This is easily expanded without hand history format change.
Type: array (of strings)
"Run_It_Twice": Two sets of board cards are used in the play of the same hand.
"Anonymous": The players at the table are all anonymous players and do not have a specified name or ID associated with them for historical records.
"Observed": The hand was observed and the hero was not dealt into the hand.
"Fast": Fast poker game. Any fast fold variant where once you fold you immediately move to the next hand.
"Cap": A game that limits the amount that each player can wager per hand.
An anonymous table that was observed: