A word of caution about the tactics problems on my website: I'm looking for cheaper or free web hosting. I may have to cut back drastically on the number of web pages on my chess lesson site.
I thought that I could replace the tactics web pages with a free tactics app, but that is going to take a long time to develop.
Therefore, my tactics web pages may become temporarily unavailable starting around September or October. I have many other tactics problems on blogs that don't cost me anything, so I may just link to those instead.