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+Here is a comparison matrix which shows a case in which
+it is possible for the forward and backward scan in 'diag'
+to meet along a nonzero length of diagonal simultaneous
+(so that bdiag[d] and fdiag[d] are not equal)
+even though there is no snake on that diagonal at the meeting point.
+
+
+     85   1   1   1  159  1   1   17
+        1   2   3   4
+60
+    1   2
+1
+    2       2   3   4
+71
+    3       3   4   5
+85
+    4   3   4   5
+17
+    5   4   5
+1
+    6       4   5   6
+183
+    7       5   6   7
+10
+    8       6   7
+1
+    9           6   7   8
+12
+                7   8   9  10
+13
+       10       8   9  10
+14
+           10   9  10
+17
+       10      10
+1
+   10   9  10
+1
+        8      10      10      10
+183
+    8   7       9       9       9
+10
+    7   6       8   9   8       8
+1
+    6   5               7       7
+1
+            5           6       6
+1
+                5       5       5
+50
+            5   4       4       4
+1
+                    4   3       3
+85
+            5   4   3   2       2
+1
+                            2   1
+17
+            5   4   3   2   1       1
+1
+                                1   0
+     85   1   1   1  159  1   1  17