A move is considered a “book move” when it is a standard opening move that is well-known and widely played in chess. These moves are often documented in chess literature, opening books, and databases, hence the term “book move”. Such moves have been extensively analyzed and studied by chess players over the years, and they are generally considered to be strong and reliable.
Book moves are typically characterized by their popularity and frequency of occurrence in high-level games. For example, in the opening moves of a chess game, it is common to see moves like 1.e4 or 1.d4, which have been played by countless grandmasters and are considered to be strong and solid opening moves.
One of the main reasons a move becomes a book move is because it has been proven to lead to favorable positions or provide a strong foundation for future development. These moves have been tested and played by strong players and have stood the test of time. They are often the result of extensive analysis and computer-generated evaluations, which help determine their strength and effectiveness.
In addition, book moves are often the result of years of study and analysis by chess experts. They are carefully documented and recorded in chess literature and opening books, which serve as valuable resources for players looking to improve their opening repertoire. By studying these well-established moves, players can gain a deeper understanding of the opening principles and strategies associated with them.
It is important to note that not all moves in a game can be considered book moves. Chess is a game of infinite possibilities, and there are countless variations and deviations from established opening theory. When players deviate from the well-trodden paths of opening theory, they are said to be “out of book”. This is where creativity and originality come into play, as players must rely on their own understanding and intuition to navigate unfamiliar positions.
Being out of book can have its advantages and disadvantages. On one hand, it allows players to surprise their opponents and potentially gain a psychological edge. On the other hand, deviating from established theory can be risky, as it may lead to uncharted territory and unknown dangers.
A move is considered a book move when it is a standard opening move that has been extensively analyzed and documented in chess literature. These moves are well-known, widely played, and have stood the test of time. They provide a solid foundation for future development and are the result of years of study and analysis by chess experts. However, chess is not solely about book moves, and players often need to rely on their own creativity and intuition to navigate unfamiliar positions.