[blind-chess] Chess Article #49 Algebraic Chess Notation
- From: Roderick Macdonald <rmacd@xxxxxxxx>
- To: Blind Chess Mailing List <blind-chess@xxxxxxxxxxxxx>
- Date: Fri, 11 Jun 2010 16:59:22 -1000 (HST)
Chess Article #49
Algebraic chess notation
Adapted and Condensed from
Wikipedia the Free encyclopedia
Algebraic chess notation
Algebraic chess notation is used to record and describe the moves
in a game of chess. It is now standard among all chess
organizations and most books, magazines, and newspapers. In English
speaking countries, it replaced the parallel system of descriptive
chess notation, which became common in the 19th century, and was
sporadically used as recently as the 1980s or 1990s. European
countries, except England, used algebraic notation before the
period when descriptive notation was common.
Algebraic notation is based on a system developed by Philipp
Stamma. It exists in various forms and languages, as will be
described below. Stamma's system used the modern names of the
squares but he used "p" for all pawn moves and the original file
("a" through "h") of the piece instead of the initial letter of the
piece.
Naming squares on the board
Each square of the chessboard is identified with a unique pair of
a letter and a number. The vertical files are labeled a through h,
from White's left (i.e. the queenside) to his right. Similarly, the
horizontal ranks are numbered from 1 to 8, starting from White's
home rank. Each square of the board, then, is uniquely identified
by its file letter and rank number. The white king, for example,
starts the game on square e1. The black knight on b8 can move to a6
and c6. Chess notations are a way to determine any unique point on
the board.
Naming the pieces
Each type of piece (other than pawns) is identified by an uppercase
letter, usually the first letter in the name of that piece in
whatever language is spoken by the player recording.
English-speaking players use K for king, Q for queen, R for rook,
B for bishop and N for knight (since K is already used). S was also
used for the knight in the early days of algebraic notation, from
the German Springer (this is still used in chess problems, where N
stands for the popular fairy chess piece, the nightrider).
Players may use different letters in other languages. For example,
French players use F for bishop (from fou). In chess literature
written for an international audience, the language-specific
letters are replaced by universal icons for the pieces, producing
Figurine notation.
Pawns are not indicated by a letter, but by the absence of such a
letter - it is not necessary to distinguish between pawns for
normal moves, as only one pawn can move to any one square (captures
are indicated differently; see below).
Notation for moves
Each move of a piece is indicated by the piece's letter, plus the
coordinate of the destination square. For example Be5 (move a
bishop to e5), Nf3 (move a knight to f3), c5 (move a pawn to c5 -
no initial in the case of pawn moves). In some publications, the
pieces are indicated by graphical representations rather than by
initials: for example, (symbol for a knight)c6. This is called
figurine algebraic notation or FAN and has the advantage of being
language independent.
Notation for captures
When a piece makes a capture, an x is inserted between the initial
and the destination square. For example, Bxe5 (bishop captures the
piece on e5). When a pawn makes a capture, the file from which the
pawn departed is used in place of a piece initial. For example,
exd5 (pawn on the e-file captures the piece on d5). Sometimes when
it is unambiguous, a pawn capture is indicated only by the files,
e.g. exd, ed5 or ed.
A colon (:) is sometimes used instead of an x, either in the same
place the x would go (B:e5) or after the move (Be5:). En passant
captures are specified by the capturing pawn's file of departure,
the x, and the square to which it moves (not the location of the
captured pawn), optionally followed by the notation "e.p." It is
never necessary to specify that a capture was en passant because a
capture from the same file but not en passant would have a
different destination square.
Within the SAN (Standard Algebraic Notation) standard, the "x"
capture indication is always required while the "e.p." en passant
move suffix indication is always forbidden.
Some texts, such as the Encyclopedia of Chess Openings, omit
indications that a capture has been made.
Disambiguating moves
If two (or more) identical pieces can move to the same square, the
piece's initial is followed by (in descending order of preference):
1. the file of departure if they differ;
2. the rank of departure if the files are the same but the ranks
differ;
3. Both the rank and file if neither alone uniquely defines the
piece (after a pawn promotion, if three or more of the same
piece are able to reach the square).
For example, with two knights on g1 and d2, either of which might
move to f3, the move is indicated as Ngf3 or Ndf3, as appropriate.
With two knights on g5 and g1, the moves are N5f3 or N1f3. As
above, an x may be used to indicate a capture: for example, N5xf3.
Pawn promotion
If a pawn moves to its last rank, achieving promotion, the piece
chosen is indicated after the move, for example e1Q, b8B. Sometimes
an "=" sign or parentheses are used: f8=N or a1 (R), but neither is
a FIDE standard. (The "=" sign is in fact used to represent the
offer of a draw.) In Portable Game Notation (PGN), pawn promotion
is always indicated by a suffixed "=" and the piece chosen. Pawn
promotions can also be found with a "/" symbol in older books. For
example g8/Q could be used to indicate promotion to a Queen.
Castling
Castling is indicated by the special notations 0-0 for kingside
castling and 0-0-0 for queenside. Note that while the FIDE
Handbook, appendix E-13 uses the digit zero, PGN requires O-O and
O-O-O instead, using an upper-case letter O.
Check and checkmate
A move which places the opponent's king in check usually has the
notation "+" added. Some use the dagger: "/-". (Sometimes ch is
used to indicate check.) Double check is sometimes represented
"++". Checkmate can likewise be indicated "#" (some use "++"
instead, but the United States Chess Federation recommends "#").
Sometimes the double dagger (not shown) is used. The word 'mate'
written at the end of the notation is also acceptable. The
Encyclopedia of Chess Openings does not indicate check.
End of game
The notation 1-0 at the end of the moves indicates that white won,
0-1 indicates that black won, and =-= indicates a draw. Often there
is no special indication of how a player won (other than checkmate,
see above), so simply "1-0" or "0-1" may be written to show that
one player resigned or lost because of time control. Sometimes the
word "Resigns" (or "White resigns" or "Black resigns" as
appropriate) is used to show this.
Notation for a series of moves
Lists of moves are generally written in one of two ways.
(1) written in two columns, as a white/black pair, preceded by the
move number and a period:
1. e4 e5
(meaning that White moves a pawn to e4, then Black moves
a pawn to e5)
2. Nf3 Nc6
3. Bb5 a6
(2) in text: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6.
Moves may be interspersed with text. When the score resumes with a
Black move, an ellipsis (...) takes the place of the White move,
for example:
1. e4 e5
2. Nf3
Black now defends his pawn
2. ... Nc6
3. Bb5
Black threatens White's bishop on b5
3. ... a6
An ellipsis is also used when a score starts with a Black move
(when the score is not of a complete game but starts from a given
position).
However, helpmates usually use an opposite convention; Black moves
first by default and White moves are indicated with an ellipsis if
no Black move precedes.
Example
An example of a full game in algebraic notation follows. This is
Kasparov versus the World, a game played by Garry Kasparov over the
internet against the rest of the world, with the World's moves
being chosen by popular vote under the guidance of a team of
grandmasters. This game demonstrates many of the notations
described above.
1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. c4 Nc6 6. Nc3 Nf6
7. O-O g6 8. d4 cxd4 9. Nxd4 Bg7 10. Nde2 Qe6 11. Nd5 Qxe4 12. Nc7+
Kd7 13. Nxa8 Qxc4 14. Nb6+ axb6 15. Nc3 Ra8 16. a4 Ne4 17. Nxe4
Qxe4 18. Qb3 f5 19. Bg5 Qb4 20. Qf7 Be5 21. h3 Rxa4 22. Rxa4 Qxa4
23. Qxh7 Bxb2 24. Qxg6 Qe4 25. Qf7 Bd4 26. Qb3 f4 27. Qf7 Be5 28.
h4 b5 29. h5 Qc4 30. Qf5+ Qe6 31. Qxe6+ Kxe6 32. g3 fxg3 33. fxg3
b4 34. Bf4 Bd4+ 35. Kh1 b3 36. g4 Kd5 37. g5 e6 38. h6 Ne7 39. Rd1
e5 40. Be3 Kc4 41. Bxd4 exd4 42. Kg2 b2 43. Kf3 Kc3 44. h7 Ng6 45.
Ke4 Kc2 46. Rh1 d3 47. Kf5 b1=Q 48. Rxb1 Kxb1 49. Kxg6 d2 50. h8=Q
d1=Q 51. Qh7 b5 52. Kf6+ Kb2 53. Qh2+ Ka1 54. Qf4 b4 55. Qxb4 Qf3+
56. Kg7 d5 57. Qd4+ Kb1 58. g6 Qe4 59. Qg1+ Kb2 60. Qf2+ Kc1 61.
Kf6 d4 62. g7 1-0
Long algebraic notation
Some computer programs (and people) use a variant of algebraic
chess notation, termed long algebraic notation or fully expanded
algebraic notation. In fully expanded algebraic notation, moves
include both the starting and ending squares separated by a hyphen:
for example, "e2-e4" or "Nb1-c3". Captures are indicated with "x"
instead of a hyphen: "Rd3xd7". This notation takes more space and
thus is not as commonly used. However, it has the advantage of
clarity, particularly for less skilled players or players learning
the game.
Some books using primarily short algebraic notation use the long
notation instead of the disambiguation forms. Long algebraic
notation was no longer recognized by FIDE as of 1981.
Numeric notation
In international correspondence chess the use of algebraic notation
may cause confusion, since different languages have different names
(and therefore different initials) for the pieces; hence the
standard for transmitting moves in this form of chess is ICCF
numeric notation.
Figurine Algebraic Notation
"Figurine Algebraic Notation" (FAN) is a widely-used variation of
algebraic notation which replaces the letter that stands for a
piece by its symbol, i.e. (symbol for a knight)c6 instead of Nc6.
This enables the moves to be read independent of language. The
Unicode Miscellaneous Symbols set includes all of the symbols
necessary for FAN. In order to display or print these symbols, one
has to have a one or more fonts with good Unicode support installed
on the computer, and the document (Web page, word processor
document, etc.) must use one of these fonts.
Common shorthand notation
The following short-hand notations are frequently used to comment
moves:
* ! a particularly good (and usually surprising) move
* !! an excellent move
* ? a bad move
* ?? a blunder
* !? an interesting move that may not be best
* ?! a dubious move - one which may turn out to be bad
* OS only move
* TN a theoretical novelty
and many others.
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