Funny story: as a kid my chess trainer told me how to mate with knight and bishop and I thought it to be "useless". However a short while later I really had thi

Funny story: as a kid my chess trainer told me how to mate with knight and bishop and I thought it to be "useless". However a short while later I really had this in a "serious" game.. I was able to mate my opponent but only because he made non-optimal moves :) Takeaway: it is really rare but good to know it.