Let's take a look at the top five male chess players who have spent the longest period as World No. 1. A Soviet Union/Russian player tops this list.

The history of chess is riddled with missed opportunities.

One of the first to react was Soviet grandmaster Anatoly Karpov, who told TASS state news ... He said he learned to play chess at the age of five in an orphanage, having managed to flee Leningrad ...

The federation called his death a "great loss to the country", saying generations of chess players had learned from his matches. One of the first to react was Soviet grandmaster Anatoly Karpov ...

Those who disliked the programme claim that the moves were hard to follow, and that the players and presenter were too hyped ...