I usually prefer to have a priority like so: Simply, either choose one at random, or have a priority set. However, in this case, we have 2 nodes with the same f value, 5. We've calculated the g, h, and f values for all of the blue nodes. The big number in the center of each square is the "f" value, while the number on the top left is the "g" value, and the number on the top right is the "h" value: Let's do the same for all the other blue squares. So, the final value for this node is "5". Now, let's try calculating the "h" value: Let's calculate the "g" value for the blue square immediately to the left of the green square: This is known as the "Manhattan Distance" (opens new window) formula. In order to calculate these heuristics, this is the formula we will use: distance = abs(from.x - to.x) + abs(from.y - to.y) This is the final number which tells us which node to move to.
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