This article uses algebraic notation to describe chess moves. Algebraic chess notation is used to record and describe the moves in a game of Chess.

Leonid Kubbel First Prize, Shakhmaty, 1925

White to play and draw.
GBR code of this study: =0323. 12g3g1

The GBR code or Guy-Blandford-Roycroft code is a system of representing the pieces on the board in a chess position. Chess is a recreational and competitive Game played between two players. Publications such as EG use it to classify endgame types and to index endgame studies. EG is a magazine that publishes Endgame studies and discusses various aspects of the endgame in Chess. In Chess, the endgame (or end game or ending) refers to the stage of the game when there are few pieces left on the board An endgame study, or just study, is a composed Chess position — that is one that has been made up rather than one from an actual game — presented as a sort of

In the GBR code, every chess position is represented by six digits, in the following format:

abcd. ef

• a = queens
• b = rooks
• c = bishops
• d = knights
• e = white pawns
• f = black pawns

For the first four digits, each white piece counts as 1, and each black piece counts as 3. The queen (♕♛ is the most powerful piece in the game of Chess. A rook, (♖ ♜ borrowed from Persian رخ rokh, Sanskrit rath, "chariot" also known as a castle is a piece in the A bishop (♗♝ is a piece in the Board game of Chess. Each player begins the game with two bishops The knight (♘ ♞ sometimes referred to by players as a 'horse' is a piece in the Game of Chess, representing a Knight (armoured cavalry The pawn (♙♟ is the weakest and most numerous piece in the Game of Chess, representing Infantry Thus, for example, if White has two knights and Black has one knight, numeral d = 1 + 1 + 3 = 5. If that is all the material other than the kings, the position is classified 0005. Values 0 through 8 represent all normal permutations of force; 9 is used if either side has promoted material. Promotion to various pieces Promotion to a queen is the most common in practical play since the queen is the most powerful piece

The last two digits of the code represent the number of White and Black pawns, respectively.

Usage

GBR code can be used to refer to a general class of material. For example, the endgame of two knights against pawn (as famously analysed by A.A. Troitzky, leading to his discovery of the Troitzky line), is GBR class 0002. Alexey Alexeyevich Troitsky, or Alexei, or Troitzky (Алексе́й Алексе́евич Тро́ицкий ( March 14, 1866 &ndashAugust Two knights can not force checkmate Troitzky line Examples This diagram shows an example of how having the pawn makes things worse for Black (here 01.

When indexing or referring to specific positions, rather than generalised material imbalances, the code may be extended in various ways. Two common ones are to prefix "+" to indicate the stipulation "White to play and win" or "=" for "White to play and draw"; and to suffix the position of the white and black kings. With these additions, the position to the right, a draw study by Leonid Kubbel (First Prize, Shakhmaty, 1925), is classified as =0323. Leonid Ivanovich Kubbel ( russian Леонид Иванович Куббель was a Russian composer of chess Endgame studies and problems 12g3g1. (The solution is 1. Bf2+ Kh1 2. h7 c2+ 3. Be3 Rxe3+ 4. Kf2 Rh3 5. Bd5+ cxd5 6. hxg8Q Rh2+ 7. Kf3 c1Q 8. Qg2+ Rxg2). The positions of other pieces can also be added; this produces a notation that provides the same information as Forsyth-Edwards notation.

The code is named after Richard Guy, Hugh Blandford and John Roycroft. Richard Kenneth Guy (born 1916 Nuneaton, Warwickshire) is a British mathematician Professor Emeritus in the Department of Mathematics Arthur John Roycroft (born 1929 is an English Chess Endgame study composer and author The first two devised the original system (the Guy-Blandford code) using different figures to represent the number of pieces. Roycroft suggested to count one for a White piece and three for a Black piece in order to make the code easier to memorise.

Examples of GBR code