It's all in your mind! (1)
Are you able to play a game of chess without view of the board? Can you solve problems and studies by just looking at a position or a diagram? Well, grandmasters and very strong players can stun us with feats of mental skill that we mortals are scarcely able to comprehend. We start our series with an experiment in which you can try competing with some great chess prodigies.
Source: chessbase.com