Figure 1 - Before: An ant facing south would be able to choose from 8 possible directions (assuming all grid squares around it are empty)
Figure 2 - After: An ant facing south can now only choose the three squares in front of it.
Figure 3 - After: An ant facing south-east can only choose the three squares in front of it.
How this solves the split trail problem
Figure 4 -Demonstrates how the problem does not now occur - the ant cannot now choose the grid square behind it, so it must choose one that is in the direction of the food.
