ed, a warning is displayed when deleting a
    branch.</p>
</blockquote>

<hr size="1" color="#C0C0C0">

<h4>Warn on invalid move</h4>

<blockquote>
    <p>When selected, a warning is displayed when playing an
    illegal move. If unchecked, an illegal move results in a <a
    href="#Sounds">sound</a> which can be itself configured.</p>
</blockquote>

<hr size="1" color="#C0C0C0">

<h4>Warn on game engine pass</h4>

<blockquote>
    <p>When selected, a message is displayed when the game engine
    passes. T