On a dartboard, what number is directly opposite No. 1?

The story behind the answer

19. On the standard “clock” dartboard, the numbers are fixed in a specific non-sequential order. If you draw a straight line through the bullseye from the 1 segment, it points directly to 19 on the opposite side.

This layout wasn’t random—it was designed to reduce lucky scoring by placing low numbers next to high ones, punishing inaccuracy (for example, 20 is flanked by 1 and 5). Often attributed to the late 19th century, this arrangement became the universal standard. Memory tip: with 20 at the top, 1 sits just to its right; half a turn (10 segments) from 1 lands you at 19, making them true opposites.