Whist is a family of names
Pagat lists Solo Whist and several other games separately from its Classic account. Treat these names as links to distinct rules rather than difficulty settings for the same game.
Keep a comparison note
Record the full title, source URL and the reason you are considering the format. Then identify what you want to compare: the number of players, partnership structure or decision sequence. Do not assume an answer from the familiar name alone.
A sensible expansion rule
This site starts with useful Classic resources. A future variant deserves its own checked introduction and appropriate examples, rather than an automatic copy of every Classic article. Our current scorebook is not a Solo Whist calculator.