I have come to a halt with this one and would appreciate a hint with the next move (and explanation why)
original puzzle:
xx2|6xx|xxx
x7x|1xx|xxx
5xx|xxx|x63
--------------
xx4|3xx|x9x
x91|x2x|37x
x3x|xx8|2xx
--------------
72x|xxx|xx8
xxx|xx3|x5x
xxx|xx9|4xx
this is how far I have got:
xx2|6xx|xxx
x76|1xx|5xx
5xx|xxx|x63
--------------
254|3xx|89x
891|x2x|37x
637|9x8|2xx
--------------
72x|xxx|9x8
xxx|xx3|65x
16x|xx9|4xx
Any ideas ?