Sept 1 (Reuters) - Online gambling firm 888 Holdings stepped up a billion pound battle for Bwin.party Digital Entertainment on Tuesday, submitting a revised takeover proposal as it looks to see off rival interest from GVC Holdings (Other OTC: GMVHF - news ) .
In the context of the input sentence, determine the relationship between '888 Holdings' and 'gambling'.
Options: location of formation, industry, owner of, distributed by