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In page Shatranj:

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The rules of chaturanga seen in India today have enormous variation, but all involve four branches (angas) of the army: the horse (knight), the elephant (bishop), the chariot (rook) and the foot soldier (pawn), played on an 8×8 board. Shatranj adapted much of the same rules as chaturanga, and also the basic 16-piece structure. There is also a larger 10×11 board derivative; the 14th-century Tamerlane chess, or shatranj kamil (perfect chess), with a slightly different piece structure.[citation needed]