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\subsection{A Zero-Sum Game:}
\begin{frame}{2-Finger-Morra}
\begin{block}
\begin{center}
 \begin{tabular}{|c||c|c|}
  \hline
  &Odd: one & Odd: two\\
  \hline \hline
  Even: one & E=2, 0=-2 & E=-3, 0=3\\
  Even: two & E=-3, 0=3 & E=4, 0=-4\\
  \hline
 \end{tabular}
\end{center}
\end{block}
\end{frame}

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\begin{block}\relax
...
\end{block}