Selection Rules - No Jumps
If no jumps are available, a player can move to any square in the same quadrant (marked by blue lines) that allows a jump on next move, i.e. adjacent to a filled square.
If Red had selected F on the last move (note that original position is shaded), and this was the complete board, no jump is available, so Red can select any square in the current quadrant that allows a jump on the next move (only R in this case).