GBR code
First Prize, Shakhmaty, 1925
| a | b | c | d | e | f | g | h | ||
| 8 |         | 8 | |||||||
| 7 | 7 | ||||||||
| 6 | 6 | ||||||||
| 5 | 5 | ||||||||
| 4 | 4 | ||||||||
| 3 | 3 | ||||||||
| 2 | 2 | ||||||||
| 1 | 1 | ||||||||
| a | b | c | d | e | f | g | h | ||
GBR code of this study: =0323.12g3g1
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
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.
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Examples of GBR code
| White material | Black material | GBR class |
|---|---|---|
| KQ | K | 1000 |
| KR | K | 0100 |
| KB | K | 0010 |
| KN | K | 0001 |
| KNN | K | 0002 |
| K | KN | 0003 |
| KN | KN | 0004 |
| KNN | KN | 0005 |
| K | KNN | 0006 |
| KN | KNN | 0007 |
| KNN | KNN | 0008 |
| KNNN | KNN | 0009 |
| KPPP | KPP | 0000.32 |
| KNN | KP | 0002.01 |
| KBB | KN | 0023 |
| KQ | KR | 1300 |
| KQP | KQ | 4000.10 |
| KRP | KR | 0400.10 |
| KRRP | KRR | 0800.10 |
| KBBP | KNN | 0026.10 |
| KBBP | KRNPP | 0323.12 |
References
- Hooper, David; Whyld, Kenneth (1992), "GBR code", The Oxford Companion to Chess (2nd ed.), Oxford University Press, ISBN 0-19-280049-3
- Roycroft, A. J. (1972), Test Tube Chess, Stackpole, p. 353, ISBN 0-8117-1734-8