Grandmaster Puzzle Site

I stumbled on this site where the author gives 3 to 75 “White/Black to play and win” puzzles from what appears to be hundreds of players ranging from Mickey Adams to Vadim Zvjaginsev. He claims that he started solving chess puzzles and his rating rose 400 points. From his introduction: Best puzzles of 2010, 30 opening videos, endgame tactics videos, Interactive puzzles (mates in 2, 3, and 4), Read 50 chess books online. Interesting site...check it out...wtharvey