The Fine Line Between Genius and Stupidity...
The grandmaster said he had offered to change his trousers for the next day, but was fined and told he needed to change immediately.
He said he had been wearing jeans for a lunch meeting, and "didn't even think about" swapping them for a different pair of trousers when heading to the tournament.
He turned up wearing a shirt, blazer, dark jeans and dress shoes and played a few rounds before being asked to change.
In a statement, FIDE confirmed the 34-year-old was fined $200 (£159), and said its rules were applied "impartially".
They cited a case where another player was fined on the same day before changing his shoes...