Enter line 1: Enter line 2: Enter line 3: Enter line 4: Enter line 5: Enter line 6: Enter line 7: Enter line 8: Enter line 9: 

Input puzzle:

060050020
000300090
700600010
006030400
004070100
005090800
040001006
030008000
020040050

Number of attempts: 10880
Number of backtracks: 1334

Solution:

861 | 459 | 723
452 | 317 | 698
793 | 682 | 514
---------------
216 | 835 | 479
984 | 276 | 135
375 | 194 | 862
---------------
547 | 921 | 386
139 | 568 | 247
628 | 743 | 951