First off I am not really pro riddle per say, however we do use some 'riddles' at my current employer.
1) Sometimes they can point out really big gaping holes in basic logic ability, for instance we ask about basic logic with the NAND gate riddle, we explain you can compose the common logical operations just using NAND. Ask the interviewee to construct NOT using NAND, usually if they have never seen anything like this, we walk em through it as a freebie... so now they have NOT and NAND, and we ask them to construct AND. How many Architects we have interviewed, with 10+ years of experience who could not logically figure out how to combine NOT and NOTAND to get a logical AND...
2) Second, we mostly dont actually care too much about getting the correct answers to the riddles. Its partially to look at the way person solves problems, but mostly its psychological. In software dealing with non tech, high level biz people, you get all kinds of bizarre requests. If you throw a hissy fit in the middle of an interview, or storm out because someone asks you a riddle... Are we to expect you to keep your head when the VP of Sales asks you for something 'crazy'?
1) Sometimes they can point out really big gaping holes in basic logic ability, for instance we ask about basic logic with the NAND gate riddle, we explain you can compose the common logical operations just using NAND. Ask the interviewee to construct NOT using NAND, usually if they have never seen anything like this, we walk em through it as a freebie... so now they have NOT and NAND, and we ask them to construct AND. How many Architects we have interviewed, with 10+ years of experience who could not logically figure out how to combine NOT and NOTAND to get a logical AND...
2) Second, we mostly dont actually care too much about getting the correct answers to the riddles. Its partially to look at the way person solves problems, but mostly its psychological. In software dealing with non tech, high level biz people, you get all kinds of bizarre requests. If you throw a hissy fit in the middle of an interview, or storm out because someone asks you a riddle... Are we to expect you to keep your head when the VP of Sales asks you for something 'crazy'?