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We have a network 8x8 of a big chessboard. The 81 grid points are the crossroads. The crossroads are linked with the neighboring crossroads through edges of 1 m length horizontally and vertically. The horizontal streets can be crossed in both directions. The vertical 1st, 3rd, 5th, 7th and 9th streets from up to down and the 2nd, 4th, 6th, 8th from down to up. In this described graph can only the four fields in the centre of the chessboard turn clockwise to 90 degrees including the street orientation. The minimum number of visited edges of the optimal solution of this graph's chinese postman problem's is then:
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