A chess diagram is graphic representation and stylized of a specific moment in a chess game, showing the different positions occupied by chess pieces in given time during game development.
This graphical representation is done through symbols previously agreed for this purpose in order to facilitate reading the diagram.
The chess diagrams are a resource widely used not only in teaching game in the courses offered to people just getting into it; but they are also used in subsequent analysis, that amateurs and professionals players at this discipline can make of games played, especially in championship games.
Similarly they are used in the development of chess problems that are all these diagrams with composed positions and whose solution is to checkmate in a given number of moves and are often published in newspapers and magazines.
Icons or symbols used represent the basic characteristics of chessmen, such as in the case of rook is used picture of a defensive tower made with bricks and with 3 battlements and 2 gunboats at top of its.
It is worth mentioning that at present most most diagrams represent the bishop using a miter with two lappets by way of feet; but there are some variants of diagrams where this piece is represented by a helmet with visor.