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Space is the boundless three-dimensional extent in which objects and events have relative position and direction. Physical space is often conceived in three linear dimensions , although modern physicists usually consider it, with time , to be part of a boundless four-dimensional continuum known as spacetime . The concept of space is considered to be of fundamental importance to an understanding of the physical universe . However, disagreement continues between philosophers over whether it is itself an entit
This page explains commonly used terms in chess in alphabetical order. Some of these have their own pages, like fork and pin . For a list of unorthodox chess pieces, see Fairy chess piece ; for a list of terms specific to chess problems , see Glossary of chess problems ; for a list of chess-related games, see Chess variants .
[adjective: prophylactic] Prophylactic techniques include the blockade , overprotection , and the mysterious rook move .