Editing ICCF numeric notation (section)

==Details==
[[Image:Postcard-for-correspondence-chess.jpg|right|thumb|250px|Correspondence chess card showing algebraic notation and ICCF notation]]

In numeric notation, each square is designated with a two-digit number via a [[coordinate system]]. The first digit describes the file and the second digit the rank. Files are numbered 1 to 8 from White's left to White's right, and ranks are numbered 1 to 8 from White's near side to White's far side. A move is defined by pairing two square designations together, one for the starting square and one for the ending square. For example, the move that would be written ''1.e4'' in algebraic notation would be written ''1.&nbsp;5254'' in numeric notation: the [[pawn (chess)|pawn]] starts from square 52 (file 5, rank 2) and moves to square 54 (file 5, rank 4). Numeric notation does not explicitly mark the type of moving piece, {{chessgloss|capture|captures}}, or [[Check (chess)|checks]]; every move is written as four digits unless resulting in promotion.

For promotion, a fifth digit is added to the move's notation: 1 for [[queen (chess)|queen]], 2 for [[rook (chess)|rook]], 3 for [[bishop (chess)|bishop]], and 4 for [[knight (chess)|knight]]. For instance, a pawn on f7 moving to f8 and promoting to a rook would be written as ''67682''. A variant four-digit notation where the ending rank is omitted (because it is always 8 for White and 1 for Black) also exists (e.g. ''6762''); however, this is considered confusing and contradicts the standard.

[[Castling]] is written using the [[king (chess)|king]]'s start position and end position. Castling {{chessgloss|kingside}} is written as ''5171'' for White and ''5878'' for Black, and castling {{chessgloss|queenside}} is written as ''5131'' for White and ''5838'' for Black. The rook's start and end positions are implied.