
doi: 10.37236/1611
Nešetřil and Sopena introduced a concept of oriented game chromatic number and developed a general technique for bounding this parameter. In this paper, we combine their technique with concepts introduced by several authors in a series of papers on game chromatic number to show that for every positive integer $k$, there exists an integer $t$ so that if ${\cal C}$ is a topologically closed class of graphs and ${\cal C}$ does not contain a complete graph on $k$ vertices, then whenever $G$ is an orientation of a graph from ${\cal C}$, the oriented game chromatic number of $G$ is at most $t$. In particular, oriented planar graphs have bounded oriented game chromatic number. This answers a question raised by Nešetřil and Sopena. We also answer a second question raised by Nešetřil and Sopena by constructing a family of oriented graphs for which oriented game chromatic number is bounded but extended Go number is not.
Coloring of graphs and hypergraphs, competive algorithm, oriented graph, game chromatic number, graph coloring, Directed graphs (digraphs), tournaments, Combinatorics in computer science
Coloring of graphs and hypergraphs, competive algorithm, oriented graph, game chromatic number, graph coloring, Directed graphs (digraphs), tournaments, Combinatorics in computer science
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