Sylver Coinage


Sylver Coinage is a mathematical game invented by John Horton Conway. Two players take turns choosing numbers, which represent denominations of money. A player may not name a number that can be expressed as a sum (with multiples) of some previously chosen numbers. The player who names 1 loses.
News of Sylver Coinage

Statement of the Progression Hypothesis

Care and Feeding of Enders

A Glossary of Sylver Coinage

Richard K. Guy's Twenty Questions


Refereed Papers


Select GNUzipped DVI or GNUzipped PostScript.


My production software is not yet available. Meanwhile, here is a simple Perl script for computing winning moves in Sylver Coinage positions.

Col. G. L. Sicherman [ HOME | MAIL ]