No space in a generated 8x8 board is ever a 9 or higher. Not an official rule of the game but a side effect of the generation algorithm
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Captured this interesting play for posterity. How did this move follow from the previous board state?pic.twitter.com/fb1WLdydT2
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The blue space in the bottom right corner would have been a 10 if the space to its left were blue, so it must be red!
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Another insight leading to weird plays: If an empty space lacks line of sight to any numbered blues, it and its empty neighbors must be red
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This is derived from the property of the generation algorithm that all boards must be unambiguously solvable from the initial state
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