Even the best grandmasters in ...

Even the best grandmasters in the world have had to work hard to acquire the technique of rook endings.
Even the best grandmasters in the world have had to work hard to acquire the technique of rook endings.
 Paul Keres

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Being self-made is a state of mind, and once you put that mentality to work, your success will come.
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Quotes from the same author

A player can sometimes afford the luxury of an inaccurate move, or even a definite error, in the opening or middlegame without necessarily obtaining a lost position. In the endgame ... an error can be decisive, and we are rarely presented with a second chance.
 Paul Keres