Shlomi Fish committed 81f89c6

Add the strategy with the loop/path of possibly diagonal white cells.

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 number, then its white edge points can be marked with black in the opposite
 direction to its extent.
+#. One cannot have a loop or a path of white cells (including diagonal ones)
+from one edge of the board to the other, which contains black cells inside,
+because this will prevent the black cells from being contiguous.
+    - Alternative phrasing: a polymino of black cells that can only expand into
+    a single grey cell will expand there.
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