Editing ICCF numeric notation

{{Short description|Chess notation system}}
{| style="float: right; margin-left: 1em; border: thin solid black; border-collapse: collapse; text-align: center;"
|-
|style="background:white; height:26px; width:26px;"|18 || style="background:silver; height:26px; width:26px;"|28 || style="background:white; height:26px; width:26px;"|38 || style="background:silver; height:26px; width:26px;"|48 || style="background:white; height:26px; width:26px;"|58 || style="background:silver; height:26px; width:26px;"|68 || style="background:white; height:26px; width:26px;"|78 || style="background:silver; height:26px; width:26px;"|88
|-
| style="background:silver; height:26px; width:26px;"|17 || style="background:white;"|27 || style="background:silver;"|37 || style="background:white;"|47 || style="background:silver;"|57 || style="background:white;"|67 || style="background:silver;"|77 || style="background:white;"|87
|-
|style="background:white; height:26px; width:26px;"|16 || style="background:silver;"|26 || style="background:white;"|36 || style="background:silver;"|46 || style="background:white;"|56 || style="background:silver;"|66 || style="background:white;"|76 || style="background:silver;"|86
|-
| style="background:silver; height:26px; width:26px;"|15 || style="background:white;"|25 || style="background:silver;"|35 || style="background:white;"|45 || style="background:silver;"|55 || style="background:white;"|65 || style="background:silver;"|75 || style="background:white;"|85
|-
|style="background:white; height:26px; width:26px;"|14 || style="background:silver;"|24 || style="background:white;"|34 || style="background:silver;"|44 || style="background:white;"|54 || style="background:silver;"|64 || style="background:white;"|74 || style="background:silver;"|84
|-
| style="background:silver; height:26px; width:26px;"|13 || style="background:white;"|23 || style="background:silver;"|33 || style="background:white;"|43 || style="background:silver;"|53 || style="background:white;"|63 || style="background:silver;"|73 || style="background:white;"|83
|-
|style="background:white; height:26px; width:26px;"|12 || style="background:silver;"|22 || style="background:white;"|32 || style="background:silver;"|42 || style="background:white;"|52 || style="background:silver;"|62 || style="background:white;"|72 || style="background:silver;"|82
|-
| style="background:silver; height:26px; width:26px;"|11 || style="background:white;"|21 || style="background:silver;"|31 || style="background:white;"|41 || style="background:silver;"|51 || style="background:white;"|61 || style="background:silver;"|71 || style="background:white;"|81
|}
'''ICCF numeric notation''' is the official [[chess notation]] system of the [[International Correspondence Chess Federation]]. The system was devised for use in international [[correspondence chess]] to avoid the potential confusion of using [[Algebraic notation (chess)|algebraic notation]], as the [[chess pieces]] have different abbreviations depending on language.

In ICCF numeric notation, each square of the [[chessboard]] has a two-digit designation. The first digit is the number of the {{chessgloss|file}}; files are numbered 1 to 8 from left to right from White's point of view. The second digit is the {{chessgloss|rank}}; ranks are numbered 1 to 8 from nearest to farthest from White's point of view. Each move is denoted by either four or five digits: the first two digits denote the square the moving piece leaves; the following two digits denote the square at which the moving piece arrives; and, where applicable, the fifth digit denotes the piece of [[Promotion (chess)|promotion]].<ref>{{harvcol|Just|Burg|2003|pp=221–22}}</ref>

==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.

==History==
German professor J. W. D. Wildt of Göttingen devised numeric notation circa 1803. Johann Koch used the system 25 years later; the system is sometimes named after him. Ivan Savenkov supported its use in 1877, and it bears his name in Russia.

==See also==
*[[Descriptive notation]]
*[[Forsyth–Edwards Notation]]
*[[Portable Game Notation]]

==References==
{{reflist}}
*{{cite book
 |last1=Hooper 
 |first1=David 
 |authorlink1=David Vincent Hooper
 |last2=Whyld 
 |first2=Kenneth 
 |authorlink2=Kenneth Whyld
 |title=[[The Oxford Companion to Chess]]
 |publisher=[[Oxford University Press]]
 |edition=2nd
 |year=1996
 |origyear=First pub. 1992
 |isbn=0-19-280049-3 }}
*{{Citation
 |surname1=Just|given1=Tim
 |surname2=Burg|given2=Daniel B.
 |year=2003
 |title=U.S. Chess Federation's Official Rules of Chess
 |edition=fifth
 |publisher=McKay
 |isbn=0-8129-3559-4}}
*{{citation
 |last=Sunnucks |first=Anne |authorlink=Anne Sunnucks
 |year=1970 
 |title=The Encyclopaedia of Chess
 |publisher=St. Martins Press
 |ISBN=978-0-7091-4697-1}} <!-- ISBN is for the second edition -->

==External links==
*[https://iccfwebfiles.blob.core.windows.net/rules/2019/THE%20ICCF%20LAWS%20OF%20CORRESPONDENCE%20CHESS%2001.01.2019.pdf ICCF Laws of Correspondence Chess]


{{chess}}

[[Category:Chess notation]]
[[Category:Correspondence chess]]