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

The combination player thinks forward; he starts from the given position, and tries the forceful moves in his mind

The attack is that process by means of which you remove obstructions.

Vanity should never tempt a player to engage in a combat at the risk of loss of health. It is bad enough to lose without the additional annoyance of paying doctors' bills.

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.

An advantage could consist not only in a single important advantage but also in a multitude of insignificant advantages.

In Chess, as it is played by masters, chance is practically eliminated.