Care to share, Bob? I have been looking at that chart for years and still don't understand it!
All the analyzes of it I have read as just as confusing as the chart.
Best,
Karen
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This might help-
THREE WAYS OF IN-BREEDING.
The A.B.C. of Breeding Poultry for Exhibition, Egg-Production and Table Purposes © 1919
" In-breeding," says Mr. Harry R. Lewis" commonly means
the mating of individuals related for one generation. In-and-in
breeding indicates those showing a longer period and closer degree
of relationship. Three ways of in-breeding are:--

In-breeding chart showing distribution of inherited 'characters. The black
denotes the blood lines of the male and the white those of the female. The
solid black lines show that a male has been chosen from the group from
which they start and the dotted lines a female
X-Male. O-Female.
1. Breeding sire and daughter which produces ¼
blood like the mother.
2. Breeding son and mother which produces progeny
with ¾ blood of the mother.
3. Breeding brother and sister which gives progeny with
blood lines from both sire and dam in equal proportions.
The latter (No. 3) is the mating referred to above as
undesirable. It is often adopted by breeders of both
Fancy stock and heavy egg-producers, but it must
not be over done. He must be sure of the vigour of
the parent stock, else this fault will be intensified in
the progeny.
Chris