Here is a small grid area of node id's from a larger grid.

52 53 54 55 56 102 103 104 105 106 152 153 154 155 156 202 203 204 205 206 252 253 254 255 256

Horizontal and vertical moves increment 10, diagonal increments 14. I am followig this tutorial ... http://www.policyalm...tarTutorial.htm

Node 103 is my starting node. So the lowest F score above takes me to node 154 from 103. I have calculated the G cost as follows from node 153.

14 10 14 10 10 14 10 14Next iterations F score gives me node 205, so I then calculate G cost from node 205 and I get the following:

28 24 28 24 24 28 24 28And one more iterations F score gives me node 256, so I calculate G cost from node 256:

42 38 42 38 38 42 38 42Am I calculating G cost correctly?

Something I don't understand is after I choose the lowest F score, the G cost of 4 nodes is always the same and therefore I can't choose a lowest G cost at this point.

Any help much appreciated.