Cornetz V. Un des aspects de l'illusion du joueur d'échecs. (Avec une figure) Essai d'algèbre humoristique. Paris, Preti, 1907. In French. 77 pages + 2 sheets on thicker paper in the middle and 1 sheet with content at the end of the book. LN 4187.

Philosophical work. From the content:

1) The value v of the player, the value V he attributes to himself and the difference (V - v)

2) (V - v) is always positive, i.e. every player thinks he is stronger than he really is.

3) (V - v) as a function of the real value v. Main aspect of the illusion.

4) Figure of the relation V - v = 1/v. Applications.

5) Special aspects.

Condition - Good to Very Good: private half-cloth binding without lettering, stamps of Czech chess club Dobrusky.