given the position of a chess piece in algebric notation, convert it into 8 by 8 matrix format. For example,
Nb. invalid ones should be represented by nan.
Return a list sorted by number of occurrences
Distance walked 1D
Distance walked 2D
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
How many ways?
ZigZag - 01
Sky full of stars - 02
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