Hi Almighty CF Community,

First I googled a lot but didn't get any explanation.(However code is available)

I feel it difficult to solve problems of type "no of ways to arrange some elements of chess so that they are attacking/not attacking each other." I was solving CSES Two Knights problem and I am struggling to come up by a general formula.

I will request if any one can explain the idea behind such problems in general? or at least for this Two Knights problem.

$$$If \,you\, know \,some \,chess \,based \,problems, \,I \,will\, request\, you \,to \,please \,share \,it. \,Thanks.$$$