@EriktheOutgolfer that's a nice challege. it took me a while to realise that "surroundings" of the current head means the 6 lines connected to it, not the neighbouring 6 points
This week Dyalog's @mkromberg is in Bangalore for Functional Conference 2018 (@FnConf) where he will be taking part in Code Jugalbandi and giving an intensive all day #APL workshop. #Dyalog #FnConf18