the vao, which moves as a bishop and captures as a hopper along bishop lines. Compound pieces Compound pieces combine the powers of two or more pieces. The queen may be considered the compound of a rook and a bishop. The king of standard chess combines the ferz and wazir (ignoring restrictions on check and checkmate). The alibaba combines the dabbaba and alfil, while the squirrel can move to any square 2 units away (combining the knight and alibaba). The phoenix combines the wazir and alfil, while the kirin combines the ferz and dabbaba: both appear in chu shogi, an old Japanese chess variant that is still sometimes played today. An amphibian is a combined leaper with a larger range than any of its components, such as the frog, a (1,1)-(0,3)-leaper. Although the (1,1)-leaper is confined to one half of the board, and the (0,3)-leaper to one ninth, their combination can reach any square on the board. When one of the combined pieces is a knight, the compound may be called a knighted piece. The archbishop, chancellor, and amazon are three popular compound pieces, combining the powers of minor orthodox chess pieces. They are the knighted bishop, knighted rook, and knighted queen respectively. When one of the combined pieces is a king, the compound may be called a crowned piece. The crowned knight combines the knight with the king's moves. The dragon king of shogi is a crowned rook (rook + king), while the dragon horse is a crowned bishop (bishop + king). The knighted compounds show that a compound piece may not fall into any of the three basic categories from above: a princess slides for its bishop moves (and can be blocked by obstacles in those directions), but leaps for its knight moves (and cannot be blocked in those directions). (The names princess and empress are common in the problemist tradition: in chess variants involving these pieces they are often called by other names, such as archbishop and chancellor in Capablanca chess, or cardinal and marshal in Grand Chess, respectively.) Combinations of known pieces with the falcon from falcon chess are named winged pieces, in Complete Permutation Chess not only winged knight, bishop, rook, and queen are featured, but also winged marshal, winged cardinal, and winged amazon. Marine pieces are compound pieces consisting of a rider or leaper (for ordinary moves) and a locust (for captures) in the