A doctrine, or scheme of things, which terminates in speculation or contemplation, without a view to practice; hypothesis; speculation.

An exposition of the general or abstract principles of any science; as, the theory of music.

The science, as distinguished from the art; as, the theory and practice of medicine.

The philosophical explanation of phenomena, either physical or moral; as, Lavoisier's theory of combustion; Adam Smith's theory of moral sentiments.

a description of some part of reality by using monadic (collective) words or other monadic symbols

a general statement that systematically calls attention to regularities and patterns

an idealized model of how some aspect of reality works

an image, a general perspective on or a set of assumptions about international relations or world politics that influences what types of questions are asked and how one answers them

Known and practiced opening, middlegame and endgame variations and positions. Opening theory is also referred to as “the book.

Chess information and knowledge to be found in books, based on the games and study of MASTERS. Books on OPENINGS contain OPENING THEORY: moves of MASTER games with comments and evaluations. There is also a lot of ENDGAME THEORY.

Known and played variations and positions in any phase of the game. Opening theory is also known as the "book."

Well known opening, middle game, and endgame positions that are documented in Chess books.

a best, albeit imperfect, attempt to report the truth about how the world works

a member), use (albeit an erroneous) mechanism of change

an understanding of the world which has the possibility of being altered as new information modifies the individual's perception of the world

a window on the world

a description of something that is supposed to happen, or supposed to be possible

a mental model of something

a relationship of the model to the things the model is supposed to represent

a tool to discover something

a Broad and Comprehensive Statement of what is THOUGHT TO BE TRUE

a statement of what causes what and why

a thought, and as a thought, it must preclude the thinker

a framework for the organization of new data that was itself drawn constructively from experience and imagination

a logically self-consistent model or framework for describing

a way of categorizing or generalizing a group of particular experiences