Nijinsky was given a rating of 138 by Timeform, the second highest for a winner of the Epsom Derby up to that time. This was later scaled up to 140 by the Racing Post. He was Timeform's Horse of the Year for 1970. Nijinsky was also voted British Horse of the Year by the Racecourse Association, gaining 38 of the 40 votes. In 2018 Nijinsky was rated the greatest ever Epsom Derby winner by a panel of experts assembled by the Daily Telegraph. In their book "A Century of Champions", John Randall and Tony Morris rated Nijinsky as a "great" Derby winner and the best Irish racehorse of the 20th Century. Vincent O'Brien named Nijinsky and Sir Ivor as the best horses he had trained, placing Nijinsky first "for brilliance." Lester Piggott concurs saying ""I think Nijinsky probably on his day was the most brilliant horse I've ever ridden". Piggott added later that Nijinsky, during the summer of 1970 when he won the 2,000 Guineas, Epsom Derby, Irish Derby and King George VI and Queen Elizabeth II Stakes, was "an unbeatable horse"