An anecdote (1) about Chandragupta Maurya indicates he learnt that attacking margins is a better battle strategy than attacking the center, and that this insight came from a hot dish (possibly hot rice, may be a hot cake). I'm looking for a genuine reference for this anecdote, but I haven't been able to come up with any. I have found one possible reference for this anecdote (2), but this is inaccessible.
Does anyone know of a reputable (academic or folklore book) reference for this anecdote?
References: (1) https://issuu.com/daraniv93/docs/chanakya (2) https://books.google.com/books?id=v3iDAAAAMAAJKauṭilya and the Arthaśāstra