Hackaback, a variant of Cirk, was invented in 2001 by Andrew B. Perkis (his name is misspelled by About Board Games). It was a finalist of the 2002 Unequal Forces Game Design Competition sponsored by Abstract Games Magazine, the Strategy Gaming Society and About Board Games. Perkis didn't think of it as a mancala game, but the move mechanism is sowing, so it clearly belongs to the mancala family of games.