Tactics Trainer missing analysis

Why do some TT problems not have source and analysis? Can somebody please analyze problem 0024927? I solved it only to realize from the comments that the solution wasn't much of a solution. It is not at all obvious how White is winning after "solving" the problem.

Some of the Tactics Trainer problems do not have the source and analysis but as you said you can always get further feedback by posting questions in the comments section for that specific Tactics Trainer problem.

Thanks for the commentary over at that problem. I'm curious though as to the technical side of how TT works. I would have guessed that the source and analysis was not just an extra part of most problems, but was an essential part that drove the engine. Every problem needs a PGN or equivalent to provide the initial position, move order, and when to stop. The source provides that. So all I can think is that there are some problems which have a source but no annotations in that source. Is that right? Were such problems some of the very first ones for TT? I understand that today all of the problem submissions are mechanically processed and automatically get a computer analysis. Thanks.