  Landau \cite{Landau1953} showed that a sequence $(d_i)_{i=1}^n$ of integers
is the score sequence of some tournament if and only if $\sum_{i\in J}d_i \geq
\binom{|J|}{2}$ for all $J\subseteq \{1,2,\dots, n\}$, with equality if
$|J|=n$. Moon \cite{Moon63} extended this result to generalised tournaments. We
show how Moon's result can be derived from Landau's result.
