I like to challenge my thinking. I’ll post fun stuff here. Do you do anything similar?
For example: this puzzle!
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I like connections. I think the NY Times features it but I have an app version that does the same thing. Good fun, not chess level though.
I use the Chess.com app. They provide daily chess puzzles that really push me (granted I’m not very good to begin with).
I use lichess because it’s free and I’m cheap. 
What is “connections?” Give a sample?
Here’s a little chess puzzle from today. Don’t look at the direct threat, look at the opportunity.
Basically you get 16 words. You have to group them into four groups of four by finding out how a set of four are connected. Connection can be conceptual, rhetorical, practical ect.
Here’s a sample from ny times. I use a different app though that allows for different levels of difficulty and multiple plays.Connections — The New York Times