Summing a grouped field

13 
<ul>
<$list filter="[tag[entry]get[week]unique[]sort[]]" variable="week">
    <$list filter="[tag[entry]field:week<week>get[win]sum[]] [tag[entry]field:week<week>get[loss]sum[]negate[]]+[sum[]]" variable="balance">
        <li>''<<week>>:'' <<balance>></li>
    </$list>
</$list>
</ul>

image
image2198×862 84.9 KB

Is this working for you ?

I modified @Maurycy solution using a code given by @Mark_S in this discussion