Since 1998, Advanced Chess (Chess with computer assistance) is played by
Grand-Masters in official Tournaments. There is not official rating,
although Anand is considered the number one in this variant, but Kramnik
defeated Anand in 2002. Kasparov is, playing Advanced Chess, in third or
fourth unnofficial position. Anand is a extremely strong player, precisely
against computer programs, and it seems it uses the programs in a better
way than his opponents, but as he said, you must play good Chess, if not,
computer aid is not enough.