Topalov lost the World Championship match with Anand 5 Â 1\/2 â `` 6 Â 1\/2 in May 2010 . Topalov won that match 4 Â 1\/2 -2 Â 1\/2 and qualified to play against the current world champion Viswanathan Anand for the World Chess Champion title but Topalov lost the match 6 Â 1\/2 -5 Â 1\/2 .