Nim on Integer Partitions and Hyperrectangles
Combinatorics
2025-06-06 v1
Abstract
We describe PNim and RNim, two variants of Nim in which piles of tokens are replaced with integer partitions or hyperrectangles. In PNim, the players choose one of the integer partitions and remove a positive number of rows or a positive number of columns from the Young diagram of that partition. In RNim, players choose one of the hyperrectangles and reduce one of its side lengths. For PNim, we find a tight upper bound for the Sprague-Grundy values of partitions and characterize partitions with Sprague-Grundy value one. For RNim, we provide a formula for the Sprague-Grundy value of any position. We classify both games in the Conway-Gurvich-Ho hierarchy.
Keywords
Cite
@article{arxiv.2506.04991,
title = {Nim on Integer Partitions and Hyperrectangles},
author = {Eric Gottlieb and Matjaž Krnc and Peter Muršič},
journal= {arXiv preprint arXiv:2506.04991},
year = {2025}
}