P_3-Games on Chordal Bipartite Graphs
Abstract
Let G=(V,E) be a connected graph. A set U subseteq V is convex if G[U] is connected and all vertices of V\U have at most one neighbor in U. Let sigma(W) denote the unique smallest convex set that contains W subseteq V. Two players play the following game. Consider a convex set U and call it the `playground.' Initially, U = emptyset. When U=V, the player to move loses the game. Otherwise, that player chooses a vertex x in V\U which is at distance at most two from U. The effect of the move is that the playground U changes into sigma(U cup {x}) and the opponent is presented with this new playground. A graph is chordal bipartite if it is bipartite and has no induced cycle of length more than four. In this paper we show that, when G is chordal bipartite, there is a polynomial-time algorithm that computes the Grundy number of the P_3-game played on G. This implies that there is an efficient algorithm to decide whether the first player has a winning strategy.
Keywords
Cite
@article{arxiv.1610.07018,
title = {P_3-Games on Chordal Bipartite Graphs},
author = {Wing-Kai Hon and Ton Kloks and Fu-Hong Liu and Hsiang-Hsuan Liu and Tao-Ming Wang and Yue-Li Wang},
journal= {arXiv preprint arXiv:1610.07018},
year = {2016}
}