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The written apparatus of games, which players are expected to have absorbed and nobody teaches. Go has at least three competing coordinate conventions for one board; backgammon numbers its points in opposite directions for the two players, deliberately; a doubling cube is a die that is never rolled; a trailing s or o on a poker hand is worth several points of equity; and the bracketed numbers at the end of a crossword clue are a British convention that American puzzles frequently omit entirely.
Letters and numbers naming points on a Go board, in three competing conventions.
Numbers, triangles, squares and circles printed on stones in a Go diagram.
Numbered points from 1 to 24, counted in opposite directions for each player.
A cube marked 2, 4, 8, 16, 32 and 64, used to raise the stake in backgammon.
Letter-and-number shorthand for a dartboard segment, such as T20 or D16.
Two-character card codes and the s or o that marks a starting hand suited or not.
Bracketed numbers after a clue, giving the answer's letter count and word breaks.
Small candidate numbers written in a cell's corners or centre.
A fixed value for each coloured ball, from one for red to seven for black.