Hello Puzzlers, I recently learned some interesting information about the book "Win at Chess" by Fred Reinfield. The problems from the Mario Lang website identified as WAC001 through 300 come from that book. First, all problems are taken from real chess games. This means that they were all problems that had to be solved during a real game and none of them are contrived. The problems are organized into 15 groups of 20 problems called tests in the book. Each test is designed to be a little harder than the previous test. So we have finished test 1 and are on the seventh problem in test 2. The problems are not organized by type of problem (pins, forks, mate threats ...), so you must decide what is the best next move without any hint of problem type. These problems therefore teach you just like a real game by making you think situationally. I hope this helps clarify how the problems work. I plan to continue posting 2 or 3 problems a week from this book. And I may post bonus problems from other books like "The Encyclopedia of Chess Middle Games" as well. Richard