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Shlomi Fish committed 967aa9d

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docs/Nurikabe_Strategies.txt

 #. If marking a cell as white will make it reachable only by one island,
 and as a result they will form a parly-diagonal loop of white cells, which
 will segment the black master region, then the cell must be black.
+
+#. If we have something like:
+   x1  x2 x3
+y1 [2W][G][B]
+y2 [ G][G][B]
+
+The if [G](x1,y2) is white, then (x2,y1) and (x2,y2) will be black which
+will form a 2*2 region of black cells which is impossible.