Geometry
posted by Dallas .
With exacty seven horizontal or vertical jumps, remove all seven red checkers leaving the single black checker.
There's 8 pieces on a grid, the black is in A1 and and reds are in A2 A3 A4 B1 B2 B3 B4.

Geometry 
MathMate
According to instructions, the pieces are placed thus:
RRRR
BRRR
or see page 6 of the following link for a visual illustration.
http://www.redmond.k12.or.us/14552011718214563/lib/14552011718214563/Lesson_1.7.pdf
According to the rules of checkers, jumps are made diagonally, and a jump must land on a vacant square.
It can be done in one move if
1. diagonal jumps are permitted, and
2. the black piece can jump forward and backwards, like a king, and
3a. the black piece can land on and capture a red piece, or
3b. if A3 is vacant (i.e. capturing a total of only 6 red pieces).
The move is A1*A3*A5*C3*A3*C1*A1 where * denotes a capture. 
Geometry 
Dallas
It doesn't say you can make diagonal moves which is why I'm confused

Geometry 
MathMate
It doesn't say the captures have to be done in one single move either. In any case, I do not see ways of doing it either. If you find the answer, please post it for the benefit of readers.
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