Development-advantage annotation symbol

Development means moving pieces from their starting squares to places where they take part in the game. It also commonly includes preparing king safety and connecting the rooks. A development advantage means that one side needs fewer moves to have its forces ready.

The Portable Game Notation (PGN) specification for the text format used to store games calls this a time or development advantage. Here, “time” means tempi, or useful moves on the board, not minutes on the clock. Numeric Annotation Glyphs (NAGs) $30-$35 distinguish White or Black and three degrees. Some applications show ↻ for White and ↺ for Black, repeating the arrow for greater strength; ⟳ is a specialized form of the sign.

A development lead can support center control, an early attack, or the initiative, but it is not identical to any of them. A side may have more pieces developed without forcing threats, or spend a tempo to gain a lasting improvement. The symbol summarizes relative piece readiness within the annotation system.