Bone-ace or bon ace is an historical English gambling game using playing cards for seven or eight players that appears related to Thirty-One.

Bone-ace is recorded as early as 1611 in John Florio's The World of Wordes,[1] but its rules first appear in 1674 in Cotton's The Compleat Gamester where he describes it as "trivial and very inconsiderable...by reason of the little variety therein contein'd [sic], but because I have seen Ladies and Persons of quality have plaid at it for their diversion, I will briefly describe it, and the rather because it is a licking Game for Money.

The bone-ace, also called the bon ace, is the commanding card and beats all the others.

Otherwise a standard 52-card pack of English pattern, French-suited cards is used with aces ranking high.

Presumably if there is a tie in either phase, positional priority applies i.e. the player who received their cards first wins.