Notation and standards
Board control
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Center annotation symbol
Level: AdvancedThe ⊞ sign marks one side's advantage in controlling the central squares.
Space-advantage annotation symbol
Level: AdvancedA circle indicating that one side controls more useful territory and has greater room to maneuver.
Kingside annotation symbol
Level: AdvancedPointed signs mark a control advantage in the half of the board where each king begins.
Queenside annotation symbol
Level: AdvancedA family of signs marking a control advantage on the part of the board called the queenside.
File annotation symbol
Level: AdvancedThe sign highlights a board file that forms an important strategic line.
Diagonal annotation symbol
Level: AdvancedThe ⇗ sign highlights a diagonal that plays an important role in the positional analysis.
Weak-point annotation symbol
Level: AdvancedThe × mark identifies a vulnerable square, pawn, piece, or area that may become a target.