Houdini 1.5a ignores mates in one

I know that resource (the backend is probably the same as for this page), but it can be a bit more tedious for such extremely long lines having to click through, and you don't get to see the complete list of moves either. In Arena, you can just click the "Demo" button, and the engine "plays" against itself, in such cases essentially just following the winning path provided by the tablebase; more importantly, you end up having the complete move list which may be scrolled through or saved for other purposes.

Anyway, for the above position I clicked throught the first 51 moves and no piece was captured, thus this winning line abstracts from the 50-move rule as well.

WHAT THE