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.
An innovation need not be especially ingenious, but it must be well worked out.
In complicated positions, Bobby Fischer hardly had to be afraid of anybody
I was unlucky, like my country.
Chess is a test of wills.
However hopeless the situation appears to be there yet always exists the possibility of putting up a stubborn resistance.