You make a bet on top of the original bet, and then the next round will determine whether or not you win.
http://horsecity.ru/phpBB3/viewtopic.php?f=10&t=249499
http://delebutik.dk/index.php?topic=45508.new#new
https://my-mobile.eu/viewtopic.php?t=71665
http://www.lada-xray.net/showthread.php?p=311091#post311091
https://my-mobile.eu/viewtopic.php?t=33552
https://muchroom.ng/index.php?topic=41240.new#new
https://muchroom.ng/index.php?topic=20636.new#new
https://muchroom.ng/index.php?topic=35663.new#new
https://foro.murenacidos.com/showthread.php?tid=29112
http://miweii.com/forum.php?mod=viewthread&tid=45149&extra=
http://www.horsecity.ru/phpBB3/viewtopic.php?f=13&t=444291