findPos returns the first index, where 'pos' was found in 'from'
p = findPos(from, pos)
The first index of "pos" within "from" is returned. Note: this function was originally designed to return the index set.
This function is central to all chess figures. It helps identifying the instance within the figure class.
Given are four positions, we want to know the first occurence of [3 4].
p = findPos([[1 2];[3 4]; [4 4]; [3 4]], [3 4])
p = 2
King, Queen, Knight, Bishop, Rook, Pawn