Forum Moderators: phranque
http://photos.mydomain.com/thumbnails.php?album=71
http://www.mydomain.com/gallery/thumbnails.php?album=71
http://www.mydomain.com/gallery/
They all now point to the new photoalbums.Then that is where the old pages should redirect to. The idea of redirecting is so that old links and bookmarks (and SERPS) won't be lost due to changes. Sending those clicks to the home page is a bad user experience and Google really does not like soft 404s. A 404 at least is not going to hurt your site, but soft 404s can.
I tried many things and they all failed