Pencils are marked with a grading scale, represented by what?

Question

What board game is played with 24 pieces on a board marked with 64 squares, where the object is to capture an enemy piece by passing over it to a vacant square behind it?

Answer 1

F, H and/or B
The letter marks how hard or soft the graphite is or that it can be sharpened to a fine point. The pencil can be marked H (in steps of 1 - 9, indicating progressively how hard the graphite is and consequently how light a mark it leaves), HB, F (indicating that it can be sharpened to a fine point), or B ((in steps of 1 - 9, indicating progressively how soft the graphite is and consequently how black a mark it leaves).