Queensland's UNiTAB is likely to launch a rival takeover bid for NSW TAB as early as today in a desperate bid to break the deadlock in the interstate battle for the totalisator. NSW TAB shares rose more than 2 per cent yesterday amid rumours UNiTAB would break its merger agreement with NSW TAB to take on Victorian gaming and wagering giant Tabcorp in a David and Goliath bidding war. Investors responded by pushing NSW TAB up 10c to $4.37.