The TAG maintains a tool for calculating the best division of TAG 'extra time' issues into two (or N) groups.
Tool source: https://glitch.com/edit/#!/tag-extra-time?path=server.js:1:0
Tool app: https://tag-extra-time.glitch.me/ (Also available from clicking the "Show (Live)" button in the upper-left region of the source editor.)
Link to become an editor of the project: https://glitch.com/edit/#!/join/cbf41964-b22d-46af-8ca4-f9ded89afbd7
- Click on the Tool app
- Click the link "Find groups solution" (this can take awhile as the brute-force algorithm runs)
TODO :-)
Thanks to Andrew Betts, author of this tool!