AC Anytime Chess or.....
Alternating Current (electricity; physics)
Authentication Code (telecommunications)
Arm Chair
Auxiliary Circuit
Anno Christi (Latin: In the Year of Christ; epigraphy)
Added Copy (libraries)
Ante Christum (Latin: Before Christ)
Atlas Centaur (US intermediate class expendable launch vehicle)
Army Component
Assistant Camera (film production)
Doesanybodycare (some members of chess.com )
Anytime chess could mean anything. Live chess is anytime chess; you can play it whenever you want