Avery Pickford is a teacher I used to work with. He regularly beat me at scrabble (and I’m pretty formidable in most crowds), and he taught me ultimate tic-tac-toe, where you add a box after every turn, and need to get four in a row to win. Now, he’s just started a blog. The first entries include a description of what makes great problems great and a call for questions. Welcome to the online conversation, Avery!