Problem with video playlist

Hii everyone.

My video collection have a sub menù
– Only S.D.
– Only H.D.

Managed with 2 smart playlists.

Today I need to add another sub menù
– Only U.H.D.

For this I need to modify the Only HD playlist from:

Code:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<smartplaylist type="movies">
    <name>Films solo H.D.</name>
    <match>all</match>
    <rule field="videoresolution" operator="greaterthan">
        <value>576</value>
    </rule>
    <order direction="ascending">sorttitle</order>
</smartplaylist>

To:

Code:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<smartplaylist type="movies">
    <name>Films solo U.H.D.</name>
    <match>all</match>
    <rule field="videoresolution" operator="greaterthan">
        <value>576</value>
    </rule>
    <rule field="videoresolution" operator="lessthan">
        <value>2159</value>
    </rule>
    <order direction="ascending">sorttitle</order>
</smartplaylist>

but not results show.

What wrong?