[[!getResources? &tpl=`marker.tpl` &parents=`[[*id]]` &includeContent=`0` &includeTVs=`1` &showHidden=`0` &hideContainers=`1` &cache=`0` &sortby=`menuindex` &sortdir=`ASC` &where=`tv.marker<7` ]]
[[!getResources? &tpl=`marker.tpl` &parents=`[[*id]]` &includeContent=`0` &includeTVs=`1` &showHidden=`0` &hideContainers=`1` &cache=`0` &sortby=`menuindex` &sortdir=`ASC` &where=`tv.marker>6` ]]

What about using the nth-something tpl feature??It is now listed in the Templating Properties. Note that tpl_N overrides any tpl_nN that would apply by divisors and that the largest tpl_nN will apply otherwise. Both override the tplOdd, tplFirst, and tplLast properties.
Has that been added to the documentation??
Thanks opengeek. Figured I was missing something.FWIW, when filtering on TV's, do not use the tvPrefix; this is only used when setting placeholders for rendering TV's. Just use the name, and do not quote strings, e.g.
Think I'll solve this by adding a `column` TV and making it either 'left' or 'right' and filter by tv.col=='left' and tv.col=='right'
Always another way to do somethign in MODx.
Cheers.
&tvFilters=`column==left`