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The GBR code (or Guy–Blandford–Roycroft code) is a system of representing the position of chess pieces on a chessboard. Publications such as ''EG'' use it to classify endgame types and to index endgame studies. The code is named after Richard Guy, Hugh Blandford and John Roycroft. 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. ==Definition== 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. 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. The last two digits of the code represent the number of white and black pawns, respectively. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GBR code」の詳細全文を読む スポンサード リンク
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