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A method for eternally dominating strong grids

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Fig. 2: Snapshot of a 10 × 10 subgrid of a much larger grid, showing the positions of the guards in a D (left) and a D 0 (right) configuration.
Tab. 1: Movements of guards from a D to a D 0 configuration in the 8 × 8 subgrid corre- corre-sponding to all possible attacks (less symmetric cases).
Fig. 3: Movements of guards from a D to a D 0 configuration in the 8 × 8 subgrid corre- corre-sponding to all possible attacks (less symmetric cases)
Fig. 4: One possible configuration of the guards in the 9 × 9 strong grid with the guards in white in the corners never moving, the guards on the paths of length seven between the corners in black, and the remaining guards in gray.
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