Chessdiags is the ultimate chess problems app-Solve over 1400 checkmate diagrams-Improve your chess skill !-Play against the strong Carballo chess engine-Create your own puzzles-Submit them to other users-Create your own chess problem repositoryChessDiags is open-source, fork the code and contribute on https://bitbucket.org/olevittThe app is totally free ! No ads !Follow me on twitter @OLevittInternet permission is only used during problem database update (mandatory only on first launch)"Application data" permission is required for sony smartwatchLiveWare