[Retros] N2A: 9+0

[Alain BROBECKER]

Dear retro friends,

Here's a new claim for N2A:
Alain Brobecker & Computer
7Q/Q3Q3/4Q3/1Q6/7Q/3Q4/6Q1/2Q5
9+0: Add two units.

According to my program the number of
queens can not be reduced to 8 (unless
there's a bug or another idea) and no
queen can be replaced by a rook. I will
look for other positions with rooks soon.

Best regards, Alain


Solution:
All squares are controlled at least twice!
Double check by promotion to queen by n.g7x?h8=Q
doesn't work, BK would be on g8 but there's not
enough room for WK to parry attack by WQe6.
So we must put WK in order to parry one check.
The squares that are controlled twice are:
a5,d1,f3,f4,f7,f8 and h2. But only f4 allows
enough room for WK to parry the second check.
+WKd2 +BKf4
7Q/Q3Q3/4Q3/1Q6/5k1Q/3Q4/3K2Q1/2Q5