Of zero interest to any chess player
4 or 5 very simple problems taking about 5-10 secs each mostly with discovered checkmates in 1 move then BOING, a padlock appears asking if you want to unlock all the 1 move mate problems or all problems (or something like that anyway). On a selecting 'yes' one is immediately asked for one's iTunes store ID & password with no clue as to whether an option to unlock the next level will follow or just notification of purchase at an unknown rate. Rubbish.