Chess problem software for Mac?


Thanks for the answers.
Chess looks like it has normal tactics. I am interested in chess puzzles - compositions, that is, not tactical positions from actual games. There is a whole art to the composition and solving of problems which is different to tactics. I can't find "Think like a king" on *******, but I am not sure it addresses what I am after.

http://www.uscfsales.com/category_s/384.htm
Try this link. I think Shredder chess program has problems/puzzles in it . I know the ipad/iphone app does but I'm not positive the mac program does. Good luck in your search.
I am starting to get interested in chess puzzles, and feeling more drawn to the idea of these than playing whole games. If I start doing these I am interested in the idea of using software. Websites like www.theproblemist.org (the website of the British Chess Problem Society) list some programmes but it seems these are only for PCs not for Macs. Does anyone know if there are any software programmes for chess problems designed for, or usable on, Macs (without using the Bootcamp option)?