It comprises a 9-square grid with 3 rows and 3 columns. The sum of this grid (the addition of the rows, columns, and diagonals) equals 15, which is considered a lucky number. Additionally, the ...

The Lo Shu grid or magic square is an ancient Chinese branch of numerology used to interpret all aspects of one's life. Details here.

And then work out the grid reference. Start by going along the corridor or bottom of the map. In the left-hand corner of the square is the eastings number: zero, four. Next, go up the stairs.