1r1r2

1r1r2 is a short alphanumeric string that occurs in several contexts, most commonly in relation to chess notation as a fragment of a board description. Its exact meaning depends on context, and by itself it does not constitute a complete, standalone specification.

In chess, strings like 1r1r2 can appear as part of Forsyth-Edwards Notation (FEN), which encodes an entire board position. In a FEN rank, digits represent consecutive empty squares and letters represent pieces (r stands for a rook, with lower-case being black). The sequence 1r1r2 would indicate a rank with two rooks on adjacent files (for example on files b and d, if interpreted in a standard left-to-right reading), separated by empty squares, followed by two empty squares. However, as written, 1r1r2 is incomplete for a full 8-square rank and cannot define a complete position by itself. It is typically encountered as part of a larger FEN string or as a shorthand in some problem descriptions or databases.

Beyond chess, the string can also function as a code or identifier in various datasets, puzzle collections, or software schemas. In such use, its meaning is highly context-specific and not universally fixed.

Users encountering 1r1r2 should rely on surrounding information to determine its intended interpretation—whether it describes a board position, serves as a database key, or acts as an internal code within a particular system.