Ending the deadlock in the Doha round of World Trade Organization talks depends on how successfully negotiators can balance their competing interests, plus a measure of luck, the WTO chief suggested Thursday.

"That's the secret of the negotiation," WTO Director General Pascal Lamy told an audience at Aoyama Gakuin University in Tokyo when asked who will have to make the biggest concessions, and in which sector, in order to successfully conclude the talks.

Referring to the arduous talks, he said the offers are on the table are not satisfactory and "these players will have to top up their offers."