This is a really good chess app. I like how it allows you to change the colors. However, there are two problems. It does not let me castle even when I follow the directions in the app. The major problem is the annoying ads. I usually dont mind ads, but this is really bad. It does not let me see the pieces I have captured. This is the only reason I rated it three stars. But other than that it is better than all of the other free chess apps I have tried on my iPhone.