AHh - yes. Forgot about the "little squares". Thanks

In the JS kata the below sudoku array test states that it should return false - but I cant see why as it is a valid sudoku matrix?

[
[ 1, 2, 3, 4, 5, 6, 7, 8, 9 ],
[ 2, 3, 1, 5, 6, 4, 8, 9, 7 ],
[ 3, 1, 2, 6, 4, 5, 9, 7, 8 ],
[ 4, 5, 6, 7, 8, 9, 1, 2, 3 ],
[ 5, 6, 4, 8, 9, 7, 2, 3, 1 ],
[ 6, 4, 5, 9, 7, 8, 3, 1, 2 ],
[ 7, 8, 9, 1, 2, 3, 4, 5, 6 ],
[ 8, 9, 7, 2, 3, 1, 5, 6, 4 ],
[ 9, 7, 8, 3, 1, 2, 6, 4, 5 ]
]

Not only is that a really clever solution - it is also a really clear and straightforward solution ;)

This bit of code has helped me immensely on how to look at and disect some fo these problems.

Thanks!