Descriptive notation

Descriptive notation is a chess notation system based on abbreviated natural language. Its distinctive features are that it refers to files by the piece that occupies the back rank square in the starting position and that it describes each square two ways depending on whether it is from White or Black's point of view. It was common in English, Spanish and French chess literature until about 1980. In most other languages, the more concise algebraic notation was in use. Since 1981, FIDE no longer recognizes descriptive notation for the purposes of dispute resolution, and algebraic notation is now the accepted international standard.

Nomenclature
With the exception of the knight, each piece is abbreviated as the first letter of its name: K for king, Q for queen, R for rook, B for bishop, and P for pawn. As knight begins with the same letter as king, it is abbreviated as either N or Kt, the former being the modern convention. In 1944, Chess Review received many letters debating the change from Kt to N.

Each square has two names, depending on the viewpoint of White or Black. Each is given a name corresponding to the piece that occupies the first  at the start of the game. Thus, in English descriptive notation the queen's file is named "Q" and the king's file is named "K". Since there are two each of the remaining pieces on the first rank, it is necessary to distinguish between them. The pieces on the queen's side of the board (to White's left; to Black's right) are named with respect to the queen, i.e. "queen's rook", "queen's knight" and "queen's bishop"; and have the shortened names "QR", "QN" and "QB", respectively. Similarly, the pieces on the king's side (White's right; Black's left) are named with respect to the king, i.e. "king's rook", "king's knight" and "king's bishop"; and have the shortened names "KR", "KN" and "KB". The rank is given a number, ranging from 1 to 8, with rank 1 being closest to the player.

This method of naming the squares means that each square has one name from White's point of view and another from Black's. For example, the corner square nearest White's left hand (i.e. square a1 in algebraic notation) is called "queen's rook 1" (QR1) by White and "queen's rook 8" (QR8) by Black.

When recording a move by White, the naming from White's point of view is used; when recording a move by Black, the naming from Black's point of view is used.

Spanish descriptive notation uses a similar system, with a few differences:
 * The initials to identify the pieces are taken from the equivalent Spanish words: R = rey (king), D = dama (queen), T = torre (rook), C = caballo (knight), A = alfil (bishop) and P = peón (pawn). The files are named after the initials of the pieces on the first rank, with those on the queen's side being suffixed by the letter "D", and those on the king's side suffixed by the letter "R". From White's left to right along the first rank this yields: TD, CD, AD, D, R, AR, CR, TR.
 * The dash, which in English descriptive notation symbolizes the word "to", is omitted.
 * The numerical rank is identified before the file, e.g. "4R" is equivalent to "K4" (e4 in algebraic notation).

In Spanish descriptive notation the Sicilian Defence (1. P-K4 P-QB4 in English) would be written '''1. P4R P4AD'''. This is also the method used in French descriptive notation.

Notation for moves
Each move is notated by a sequence of characters that is structured based on the move's type. Special indicators are added to the end of the sequence if relevant.


 * Non-capturing move: A move without capture is notated by the piece's name, a hyphen and the destination square, e.g. N-QB3 (knight to queen's bishop 3) and P-QN4 (pawn to queen's knight 4).
 * ': A capture is notated by the piece's name, a cross ("x"), and the name of the piece captured, e.g. QxN''' (queen captures knight).
 * Castling: The notation O-O is used for castling and O-O-O for castling . The word "Castles" is sometimes used instead, particularly in older literature, in which case it may be necessary to disambiguate between kingside and queenside castling; this may be done by specifying the rook, i.e. "Castles KR" or "Castles QR".
 * Promotion: Parentheses are used to indicate promotion, with the promotion piece enclosed in parentheses, e.g. P-R8(Q). Sometimes a slash or an equal sign is used, e.g. P-R8/Q, P-R8=Q.
 * Special terms and symbols: Special indicators that are appended to the move include "e.p." (en passant), "ch" or "+" (check), "?" (a question mark for a bad move), "!" (an exclamation mark for a good move), "mate" or "++" (checkmate), "resigns" and "draw".

Typically, the full designation for a piece or a file is shortened to just the last part (indicating type of piece) whenever this does not produce ambiguity. For example, the move KP-K4 would always be written P-K4 since only one pawn can move to K4 without capturing; the move Q-QB4 would be written Q-B4 whenever Q-KB4 is not a legal move. A pawn capturing a pawn may be shown as PxP if it is the only one possible, or as BPxP if only one of the player's bishop's pawns can capture a pawn, or as QBPxP, or PxQBP or other such variations.

Disambiguation of pieces using notations like QBP and KR becomes awkward once the pieces have left their starting positions (or for pawns, left their starting files), and is impossible for pieces created by promotion (such as a second queen). So as an alternative, moves may also be disambiguated by giving the starting square or the square of a capture, delimited by parentheses or a slash, e.g. BxN/QB6 or R(QR3)-Q3. Sometimes only the rank or file is indicated, e.g. R(6)xN.

When listing the moves of a game, first the move number is written, then the move by White followed by the move by Black. If there is no appropriate move by White to use (e.g. if the moves are interrupted by commentary) then an ellipsis ("...") is used in its place.

History
In the earliest chess literature, natural language was used to describe moves. This is the ultimate source of all forms of descriptive notation. Over time, abbreviations became common, and a system of notation gradually evolved. For example, the common opening move 1.e4 was originally recorded as "Pawn to King's Fourth" or similar; by the time of Howard Staunton's The Chess-Player's Handbook (1847), this had been abbreviated to "P. to K's 4th."which was later further reduced to "P-K4".

Comparison to algebraic notation
While descriptive notation is largely regarded as obsolete, it does have a few minor advantages over algebraic notation. By identifying each square with reference to the player on move, descriptive notation better reflects the symmetry of the game's starting position (e.g. "both players opened with P-QB4 and planned to play B-KN2 as soon as possible"). Generic descriptions which refer to all four sectors of the board are also possible, e.g. "all four bishops were developed on N2." Maxims such as "a pawn on the seventh is worth two on the fifth" make sense from both players' perspectives. Because the type of each captured piece is specified, it is easier to visualize the material balance at any point in the game when skimming over a.

On the other hand, algebraic notation has several advantages. The notation for any given move is almost always more concise in algebraic notation than in descriptive notation; this can reduce the length of chess books and magazines by several pages. While confusion can arise in descriptive notation because each square has two names, no such problem exists in algebraic notation. Algebraic notation specifies a capturing piece's destination square; meanwhile, because unambiguous captures lack coordinate information in descriptive notation, visualization is more taxing, since it requires remembering exactly which pieces are attacking which.

Example
The following game scores show the Evergreen Game.

English descriptive notation: • #P-K4 P-K4

• #N-KB3 N-QB3

• #B-B4 B-B4

• #P-QN4 BxNP

• #P-B3 B-R4

• #P-Q4 PxP

• #O-O P-Q6

• #Q-N3 Q-B3

• #P-K5 Q-N3

• #R-K1 KN-K2

• #B-R3 P-N4

• #QxP R-QN1

• #Q-R4 B-N3

• #QN-Q2 B-N2

• #N-K4 Q-B4

• #BxQP Q-R4

• #N-B6 ch PxN

• #PxP R-N1

• #QR-Q1 QxN

• #RxN ch NxR

• #QxP ch KxQ

• #B-B5 dbl ch K-K1

• #B-Q7 ch K-B1

• #BxN mate

Spanish descriptive notation: • #P4R P4R

• #C3AR C3AD

• #A4A A4A

• #P4CD AxP

• #P3A A4T

• #P4D PxP

• #O-O P6D

• #D3C D3A

• #P5R D3C

• #T1R CR2R

• #A3T P4C

• #DxP T1CD

• #D4T A3C

• #CD2D A2C

• #C4R D4A

• #AxPD D4T

• #C6A+ PxC

• #PxP T1C

• #TD1D DxC

• #TxC+ CxT

• #DxP+ RxD

• #A5A+ R1R

• #A7D+ R1A

• #AxC++

Algebraic notation: • # e4 e5

• # Nf3 Nc6

• # Bc4 Bc5

• # b4 Bxb4

• # c3 Ba5

• # d4 exd4

• # 0-0 d3

• # Qb3 Qf6

• # e5 Qg6

• # Re1 Nge7

• # Ba3 b5

• # Qxb5 Rb8

• # Qa4 Bb6

• # Nbd2 Bb7

• # Ne4 Qf5

• # Bxd3 Qh5

• # Nf6+ gxf6

• # exf6 Rg8

• # Rad1 Qxf3

• # Rxe7+ Nxe7

• # Qxd7+ Kxd7

• # Bf5+ Ke8

• # Bd7+ Kf8

• # Bxe7#