The laws of chess do not permit a free choice: you have to move whether you like it or not.

Loss generally occurs when a player overrates his advantage or for other reasons seeks to derive from a minute advantage a great return such as a forced win.

Of my fifty-seven years I have applied at least thirty to forgetting most of what I have learned or read. Since then, I have acquired a certain ease and cheer which I should never again like to be without. (...) I have stored little in my memory, but I can apply that little, and it is of use in many and varied emergencies. I keep it in order, but resist every attempt to increase its dead weight.

Show me three lines of the opening theory moves and I will prove to you that two of them are incorrect.

Steinitz was a thinker worthy of a seat in the halls of a university. A player, as the world believed he was, he was not; his studious temperament made that impossible; and thus he was conquered by a player and in the end little valued by the world, he died.

By what right does White, in an absolutely even position, such as after move one, when both sides have advanced 1. e4, sacrifice a pawn, whose recapture is quite uncertain, and open up his kingside to attack? And then follow up this policy by leaving the check of the black queen open? None whatever!

To refer to the oft mooted question, "Which piece is stronger, the Bishop or the Knight?" it is clear that the value of the Bishop undergoes greater changes than that of the Knight.