[r-t] 720s

Robin Woolley robin at robinw.org.uk
Wed Mar 5 15:13:16 UTC 2014

Hi All,

As is widely known, it is possible to obtain an extent of plain minor 
using just 12 calls. One such is 3*1236 + a common single, all at home, 
twice repeated.

Does any one know when and by whom this was first published?

Best wishes

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