This is the original
6xx x9x xx4
x91 3x4 28x
xxx xxx xxx
x5x x2x x9x
x2x 8x7 x5x
x8x x1x x4x
xxx xxx xxx
x14 9x2 57x
9xx x4x xx3
Which I can resolve as far as;
6xx 29x xx4
x91 3x4 28x
x4x xxx 9xx
15x 42x x9x
429 8x7 x51
x8x 519 x42
xxx xxx 4x9
x14 9x2 57x
9xx x4x xx3
And then I'm stumped. Now there are a few squares which only have two solutions, for example 1,6 is 3 or 7, by guessing on one of these I can then do the rest, however I cant see a logical way of choosing for that or any other square at this point.
So, I've completed it, but Id welcome something which says how to do it logically without a pure guess. Did I miss something obvious or is it difficult?
TIA
Cheers
Joe