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A valid move, in a given position, is a legal move, in keeping with the Chess rule. A player is not allowed to play a non valid move (Chess Terminology - Chess Rule). Value: a number attributed at each piece as an estimation of its comparative value (Chess Terminology - Current Chess Theory). The Nominal Value of Chess Pieces is usually given as follow:
(Chess Terminology - Current Chess Theory). The Dynamic value of Chess Pieces is the evolutive value that you may attribute to each piece (pawn or figure) according to its activity For example, in the following position:
it is obvious that White and Black pieces do not have the same value at all! (Chess Terminology - Current Chess Theory). Valve: A move which simultaneously opens a line (file, rank or diagonal) while closing another (Chess Terminology). Sometimes the initiative, an attack, or an other advantage, may Vanish suddenly for many reasons (Chess Terminology - Current Chess Theory). (Good) Vantage Point: Interesting position of a chessman currently not engaged in the fight, but observing the situation and being able to intervene quickly (Chess Terminology - Chess Tactics). Variation: All line of play intervening in a game, manly during the opening (Chess Terminology). Classical Variation: All classical line of play of the opening, normally belonging to the opening theoretical phase (see: Opening Theoretical Phase (OPTP:)). (Chess Opening - NCT IV - "Unfolding of a game"). Usually extending a classical line of play of the opening, a New Variation is a new line recently experimented by some grandmasters and interesting to add at his repertory. In the usual course of a game such a variation belongs to the opening speculative phase (see: Opening Speculative Phase (OSP:)) (Chess Opening - NCT IV - "Unfolding of a game"). Usually extending a classical or new line of play of the opening, a Critical Variation is a fully new line recently introduced by a few number of grandmasters and not really experimented. In the usual course of a game such a variation belongs to the opening critical phase (see: Opening Critical Phase (OPCP:)) (Chess Opening - NCT IV - "Unfolding of a game"). A Doubtful Variation is a more or less fanciful line of play not recognized by the theory. Such a line is usually played by amateur (i.e. enthusiast like you and us!...) Chess players. (Chess Opening - Chess Terminology). Violent Attack: A strong and fast attack being possibly based on one or more sacrifices (Chess Terminology). Violent Counter-Attack: A strong and fast counter-attack being possibly based on one or more sacrifices (Chess Terminology).
«The Chess-Theory Virtual Art Museum» Many great artists like 
Marcel Duchamp,
Man Ray,
Layachi Amidouche,
Samuel Bak
Nicolas Sphicas
Dominique Digeon
and many other have dedicated a significant part of their work to an
original evacation of the Chess game.
But finally, mainly for the pleasure but also because of a certain interior (we want to say personal) need, we were led to integrate into our museum many other great artists, painters, sculptors or photographers:
Karel Van Mander,
Cornelis de Man,
Eugène Delacroix,
Honoré Daumier,
Victor Vasarely,
Francis Picabia,
Wassily Kandinsky,
Paul Klee,
Pablo Picasso,
Henri Matisse,
Félix Nadar
and much others... which find there a very natural place. It goes without
saying we will continue this construction with eagerness and passion!...
(Chess and Art - Chess-Theory website - "Virtual Art Museum"). Visibility: A concept developped in the NCT Lecture and relative to the clearness of sight of the player developing concretely his plan This feature is complex and integrate many elements strategic as well as tactical. (Chess War Terminology - NCT XVIII - "Choice of a plan" - NCT IXX - "Keys of success").
The
Chess-Theory Glossary is presented on 25 pages.
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