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arxiv: 1008.1865 · v1 · pith:YHECHQEJnew · submitted 2010-08-11 · 🧮 math.CO · cs.DM· math.PR

Hitting time results for Maker-Breaker games

classification 🧮 math.CO cs.DMmath.PR
keywords graphrandomtimemakerprocessfirstdegreeexactly
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We study Maker-Breaker games played on the edge set of a random graph. Specifically, we consider the random graph process and analyze the first time in a typical random graph process that Maker starts having a winning strategy for his final graph to admit some property $\mP$. We focus on three natural properties for Maker's graph, namely being $k$-vertex-connected, admitting a perfect matching, and being Hamiltonian. We prove the following optimal hitting time results: with high probability Maker wins the $k$-vertex connectivity game exactly at the time the random graph process first reaches minimum degree $2k$; with high probability Maker wins the perfect matching game exactly at the time the random graph process first reaches minimum degree $2$; with high probability Maker wins the Hamiltonicity game exactly at the time the random graph process first reaches minimum degree $4$. The latter two statements settle conjectures of Stojakovi\'{c} and Szab\'{o}.

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