H. J. Murray wrote a book on the history of this activity and included several Arabic documents pertaining to it called “mikhariq” (“mee-CAR-ihk”). This is the first of three activities that was the subject of a book commissioned by Alfonso X of Castile that includes its “astronomical” variety. A “great” variation of this activity was legendarily developed by Tamerlane. A discovery on the Isle of (*) Lewis (10[1])yielded a hoard (10[1])of items (10[2])used for this activity (10[1])made mostly from walrus ivory. A treatise on this activity by the Spanish priest Ruy Lopez introduced a namesake strategy for this activity. This activity evolved from a similar one in India called chaturanga, which also used an eight-by-eight board. For 10 points, name this board game where players seek to win through checkmate. ■END■