Jeff Sarwer was the intimidating 8-year-old chess prodigy who drew against Josh Waitzkin to share a US Junior Chess championship title (the basis for the dramatic finale in the film "Searching for Bobby Fischer"). He's a professional poker player now.

Jennifer Shahade also interviewed him for the USCF website a few years ago: http://www.uschess.org/index.php/January/Lost-and-Found-An-Interview-with-Jeff-Sarwer.html

A neat twist on chess tactic puzzles where you have to do a bit more visualization to solve the tactic.

They've also recently added pieceless tactics for even better blindfold practice: https://listudy.org/en/pieceless-tactics/1203

A very useful calculator for determining win/draw/loss probabilities for two players given their ratings.

Short guide to analyzing chess games.

There’s something hypnotizing about watching a guy known as “the Mozart of chess”—a player who is quantifiably better than Bobby Fischer—taking a big gulp of beer, announcing his position as “completely winning,” then singing along to Dr. Dre saying “motherfuck the police” while coasting into another quick checkmate.

Useful Elo calculator.

computational geometry, chess, running, programming...

Difficulty of various games for computers.

And a short intro to shogi for western chess players.

More on Xiangqi in Columbus Park