+ ('Grasshopper', 'Long jumps over pieces'),
+ ('Hidden', 'Unidentified pieces'),
+ ('Hiddenqueen', 'Queen disguised as a pawn'),
+ ('Knightmate', 'Mate the knight'),
+ ('Knightrelay1', 'Move like a knight (v1)'),
+ ('Knightrelay2', 'Move like a knight (v2)'),
+ ('Losers', 'Get strong at self-mate'),