rubicon

Fortunately for England ſhe is yet on the peaceable ſide of the Rubicon; but as the flames once kindled are not alway eaſily extinguiſhed, the hopes of peace are not ſo clear as before the late myſterious diſpute began.

The game is called a double, and you score 200 instead of 100 when your adversary does not get 100, which, in technical language, is called crossing the Rubicon.