THE BASKETBALL
four FIBA sizes with their circumference and mass — and why the rules set a bounce, not a pressure
FOOTBALL: THE BALL
Law 2, three codes of the game, five sizes and three FIFA quality marks — what a ball must survive
BALLS BY THE RULES
eleven sports at true relative size — circumference, mass, pressure, and who sets them
BISHOP
a diagonal at any distance — and the half of the board that will never come
KING
one square in any direction, from three in the corner to eight in the middle, and castling
KNIGHT
the nearest square off the lines, over pieces, and four moves to the square next door
THE MOVES OF THE PIECES
all six moves from one square, the article of the rules and how many squares each piece holds
PAWN
one square forward, two on its first move, capturing diagonally — and never going back
QUEEN
file, rank and diagonal together — from twenty-one squares to twenty-seven
ROOK
fourteen squares from any square of the board — the one piece that does not care where it stands
MARTIAL ARTS FAMILY TREE
fifteen schools and thirteen lines of transmission — every arrow is a documented apprenticeship, not a legend