Onze et demie ("Eleven and a half"), also Onze et demi, is an historical German banking game for any number of players and a close relative of Vingt et un.
It is first recorded on 1821[1] and it appears to have become obsolescent in the second half of the 20th century, its last rules being published in 1967.
[2] It is sometimes called Elfeinhalb or Halbzwölf, both of which also mean "eleven and a half".
Anyone who has a court and buys an Ace has a natural onze et demie and is paid double.
The banker collects the stakes of those who lose and pays from the bank those who win.