This was another good example of when to use an elimination word...
Although I didn't have the last four letters for sure after Guess 2, I did actually have it worked out as -ATCH with seven possible leads - BCHLMPW
Guessing one at 3 had only a 1/7 chance of being right, and leaves 3 guesses and 6 possible answers i.e. a 50/50 chance of getting it solved at all...
Hence, an elimination word at 3 is a better option....
I decided to ignore C H because I suspected the word ended -ATCH, which left B L M P W. So I guessed 'BLIMP' at 3, and struck out.
Hence, I was also left with 3 guesses but now there is only 3 possible answers (assuming -ATCH was right, which it was) - CATCH, HATCH and WATCH. Luckily, I got it first time, but even if I hadn't, BLIMP guaranteed that I would have got it in 5 or 6.