George Duke wrote on Mon, Jun 29, 2009 10:45 PM UTC:
Jeremy, to your recent question of all, I once saw a CV -- one only -- in
1994 Pritchard 'ECV' with that exact wording but different enough
meaning, instead really being ''it takes two pieces to attack.'' Their earlier
idea is variation on your (2) Mutators: such as White N on d3 and B on a3 can
either one take opponent on b4, but if only one attacks, there can be no
capture at all. So it is different from your test example here. It was in the last 1/3 of ECV on an odd-number page about
'S' to 'W' where anyone could easily re-locate it.
http://www.goddesschess.com/whatsnew/whatsnew.html
