Interesting thread. My most used strains over the past few years have been:
- WLP001/WY1056/US-05: For making IPAs and APAs.
- WLP013 London Ale: For dark English beers (but might move to London Ale III or Verdant)
- WLP530/WY3787/Westmalle: For various Trappist/Belgian beers.
No, sorry, four is the absolute minimum.
- WLP565/WY3724: I have not settled on the Dupont strain, but it has made some good Saisons for me.