What should it be betting, and what does it bet?
Also, is the decimal separator a comma or a period for you?
A slight over bet will be caused by the fact that
<font class="small">Code:</font><hr /><pre>bet := Round(Round((pot + call * 2) * fraction / round) * round, 2)</pre><hr />
is wrong.
But that would be just as wrong for play money too.