Tag with the sport as well as the league. Let's say I'm interested in cricket questions, and have that as one of my favourite tags. If we don't tag all cricket questions with cricket, I've got to set all of the following as favourite tags (potentially. I appreciate most of these don't exist at the moment, but they could if we were tagging only with the league):
- County Championship
- Royal London One-Day Cup
- Natwest t20 Blast
- Sheffield Shield
- Matador BBQs One-Day Cup
- Big Bash League
- Ranji Trophy
- Vijay Hazare Trophy
- Indian Premier League
- At least 3 more leagues in South Africa
- At least 3 more leagues in the West Indies
- At least 3 more leagues in New Zealand
- More leagues in Pakistan, Sri Lanka, Bangladesh and Zimbabwe.
- Any number of women's leagues
- Any number of leagues in the non-Test playing countries.
- Any number of lower level leagues.
The same problem exists for other sports: how many soccer competitions are there?