[Retros] N2Ai: 7Qs+2Rs
elkies at math.harvard.edu
Wed Apr 13 15:37:35 EDT 2011
Alain BROBECKER <abrobecker at yahoo.com> writes:
> The computer at last found a 7Q+2R position for N2Ai.
> There won't be much of them i think.
> I don't know if it's more interesting than
> previous 8Qs+1R position
Neat -- but wait, what about double checks?
Come to think of it the one-Rook problem has such cooks as well
and this one does too (Kb4/kb1: Q7/7Q/3Q1Q2/1Q6/1K4Q1/4Q3/R7/1kR5).
Did you also look for positions with a Bishop in the corner?
A Bishop on a1 can't give check even once unless it's discovered check,
so b2/c3 are already dealt with and each of the five squares d4-h8
need only be covered once more. No double-check worries either
unless you also try to replace one of the remaining Q's by a Rook.
More information about the Retros