@article {MATHEDUC.06058258,
author = {Fraenkel, Aviezri S.},
title = {RATWYT.},
year = {2012},
journal = {The College Mathematics Journal},
volume = {43},
number = {2},
issn = {0746-8342},
pages = {160-164},
publisher = {Mathematical Association of America (MAA), Washington, D.C.},
doi = {10.4169/college.math.j.43.2.160},
abstract = {Summary: WYTHOFF is played on a pair of nonnegative integers, $(M, N)$. A move either subtracts a positive integer from precisely one of $M$ or $N$ such that the result remains nonnegative, or subtracts the same positive integer from both $M$ and $N$ such that the results remain nonnegative. The first player unable to move loses. RATWYT uses rational numbers instead, transformed using a generalization of the rules of WYTHOFF. Using the Calkin-Wilf tree, we show how to play RATWYT, and any other rational take-away game.},
msc2010 = {A24xx},
identifier = {2012d.00017},
}