By chance while checking for any update to Vicoli’s “Chess Studio”, I found this outstanding chess opening app! My chess suffers from constant weak opening play and after a few dedicated hours with this program I have improved significantly when using my three favorite Black openings as I play opponents on-line. I have several other iPad chess opening apps that for several reasons including being BORING to use never made much difference to my opening play as Black.The interface is easy to learn and use, a crucial factor in its effectiveness. It’s features are well chosen and add the feeling “to explore”. The ability to replay Grandmasters’ openings with Stockfish assisting my understanding their game positions is a special feature to me. (Some favorite past Grandmasters I hope will be added to the 100+ available.)A wonderful addition to my iPad chess applications!