I was just trying to find whether there was a COW#33 in the Challenges thread, but the Search facility doesn't seem to be working.
I clicked on the yellow Search tab (between Forums and Help) and then Advanced Search. I selected the Challenges forum on the left, entered 33 in the Keywords field, selected Search in subject only, and left everything else as default. No results were found, although there is a thread called SOW #33 right there on the first page.
I then tried again exactly the same but searching for SOW, which there are loads, and again, no results.
I tried again with #33, and got post#33 from 2002 (the default is one year ago and newer) which doesn't have #33 anywhere in the subject, so it seems that something is amiss with the coding.
Sorry - it does seem to be OK when using the advanced search. In this case I did a simple search for #42 and got post #42 from 2002. Not SOW #42 or COW #42. I should have used the advanced search. My apologies.