Maker-Breaker domination game on Cartesian products of graphs

Document Type : Original paper

Author

Institute of Mathematics, Physics and Mechanics, Ljubljana, Slovenia

Abstract

The Maker-Breaker domination game is played on a graph G by two players, called Dominator and Staller.  They alternately select an unplayed vertex in G. Dominator wins the game if he forms a dominating set while Staller wins the game if she claims all vertices from a closed neighborhood of a vertex.  The game is called D-game if Dominator starts the game and it is an \emph{S-game} when Staller starts the game.  If Dominator is the winner in the D-game (or the S-game), then γMB(G) (or γMB(G)) is defined by the minimum number of moves of Dominator to win the game under any strategy of Staller.  Analogously, when Staller is the winner, γSMB(G) and γSMB(G) can be defined in the same way.  We determine the winner of the game on the Cartesian product of paths, stars, and complete bipartite graphs, and how fast the winner wins. We prove that Dominator is the winner on PmPn in both the D-game and the S-game, and γMB(PmPn) and γMB(PmPn) are determined when m=3 and 3n5. Dominator also wins on GH in both games if G and H admit nontrivial path covers. Furthermore, we establish the winner in the D-game and the S-game on Km,nKm,n for every positive integers m,m,n,n.  We prove the exact formulas for γMB(G), γMB(G), γSMB(G), and γSMB(G) where G is a product of stars.

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