The reviews had me skeptical, but this is the best software I've seen so far. I only really play the blindfold vs. engine easy mode, but it works like a charm. Really helps improve visualization, calculation, and memory. I'll admit, it did have me tilted in my first few games because it can't distinguish well between the sounds of the file letters. Easy work around though~ just use the NATO phonetic alphabet, e.g. "Play echo takes delta 5". Also, make sure you specify which knight or which rook to a certain square when both have access to the square you have in mind. Seems obvious, but it provoked me into ending a game early when first starting as my noob self didn't understand til seeing the position. Overall, this is a fun way to improve and I'm thankful there's an app for it. I've noticed improved visualization accuracy and speed when playing OTB. Also, I can beat my buddy blindfolded now, even though he's only 200. Still, it's fun to show off