princess on an 8×8 board, as well as that, on 10×8 boards, princess plus pawn even has a slight advantage over queen. This may seem counterintuitive, as the value difference of these pieces' non-bishop-components (rook vs. knight) is closer to 2 pawns, implying an unusually large synergy between the bishop and knight move. A mathematical approach used to determine relative piece value in Musketeer Chess estimated the value of the princess as 770 centipawns on an 8x8 board. Princess versus rook is usually a draw, as is queen versus princess. King and princess versus king is a forced win for the side with the princess; checkmate can be forced within 17 moves. In comparison, the queen requires 10 moves and the rook requires 16. A princess can checkmate a lone king without the aid of its own king in a position where the enemy king is in the corner and the princess is two spaces diagonally away from it, but this position cannot be forced. Ralph Betza (inventor of chess with different armies, in which the princess was used in one of the armies) rated the princess as about seven points, intermediate between a rook and a queen, noting that it was "a weak Queen" and that its 12 directions of movement is greater than the queen's 8 directions. However, all three of his alternate armies for that game are actually stronger than the standard FIDE army which they were supposed to equal, reflecting the general tendency for players to undervalue pieces which they are unfamiliar with; Larry Kaufman commented that this is particularly true for the princess. Symbol Both white and black symbols for the princess were added to version 12 of the Unicode standard in March 2019, in the Chess Symbols block: 🩐 U+1FA50 WHITE CHESS KNIGHT-BISHOP 🩓 U+1FA53 BLACK CHESS KNIGHT-BISHOP See also Amazon—the rook+bishop+knight compound Empress—the rook+knight compound Queen—the rook+bishop compound Notes References Bibliography Piececlopedia: Bishop–Knight Compound by Fergus Duniho and David Howe, The Chess Variant Pages Endgame statistics with fantasy pieces by Dave McCooey, The Chess Variant Pages The NB (Princess) by Ralph Betza, The Chess Variant Pages BuyPoint Chess by Ralph Betza; contains a list of pieces with approximate values Great Chess - Indian / Turkish variant by Hans Bodlaender, The Chess Variant Pages Fairy chess pieces