 ┌───────┬───────┬───────┐
 │     7 │   3   │       │
 │ 2 4   │   9   │       │
 │ 9     │ 6     │   5 7 │
 ├───────┼───────┼───────┤
 │     9 │       │     2 │
 │   6   │ 8   3 │   9   │
 │ 8     │       │ 7     │
 ├───────┼───────┼───────┤
 │ 5 1   │     6 │     8 │
 │       │   8   │   1 4 │
 │       │   1   │ 6     │
 └───────┴───────┴───────┘

Guess of 1 at (0, 0)
Hidden single 6 at (2, 1)
Hidden single 5 at (1, 0)
Hidden single 6 at (0, 7)
Guess of 2 at (3, 0)
Hidden single 4 at (4, 2)
Hidden single 8 at (5, 0)
Hidden single 1 at (5, 2)
Hidden single 2 at (6, 2)
Guess of 4 at (6, 0)
Hidden single 6 at (7, 0)
Hidden single 9 at (8, 0)
Hidden single 6 at (8, 5)
Hidden single 6 at (4, 3)
Guess of 5 at (3, 1)
Hidden single 7 at (5, 1)
Guess of 3 at (7, 1)
Hidden single 8 at (6, 1)
Hidden single 1 at (8, 1)
Hidden single 8 at (7, 3)
Hidden single 5 at (8, 4)
Hidden single 1 at (6, 4)
Hidden single 3 at (6, 3)
Hidden single 7 at (1, 3)
Hidden single 4 at (0, 3)
No candidates at (0, 4)
Backtracking 9 guesses
Guess of 8 at (7, 1)
Hidden single 8 at (6, 3)
Guess of 1 at (6, 1)
Hidden single 3 at (8, 1)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 5 at (8, 8)
Hidden single 5 at (5, 7)
Hidden single 4 at (5, 3)
Hidden single 3 at (7, 3)
Hidden single 7 at (0, 3)
No candidates at (1, 3)
Backtracking 9 guesses
Guess of 3 at (6, 1)
Hidden single 1 at (8, 1)
Hidden single 1 at (6, 4)
Hidden single 5 at (8, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (5, 8)
Hidden single 4 at (5, 3)
Hidden single 3 at (7, 3)
Hidden single 7 at (0, 3)
No candidates at (1, 3)
Backtracking 14 guesses
Guess of 7 at (3, 1)
Hidden single 5 at (5, 1)
Guess of 3 at (7, 1)
Hidden single 8 at (6, 1)
Hidden single 1 at (8, 1)
Hidden single 8 at (7, 3)
Hidden single 5 at (8, 4)
Hidden single 1 at (6, 4)
Hidden single 3 at (6, 3)
Hidden single 7 at (1, 3)
Hidden single 4 at (0, 3)
No candidates at (5, 3)
Backtracking 9 guesses
Guess of 8 at (7, 1)
Hidden single 8 at (6, 3)
Guess of 1 at (6, 1)
Hidden single 3 at (8, 1)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 5 at (8, 8)
Hidden single 5 at (3, 7)
Hidden single 5 at (4, 5)
Hidden single 1 at (2, 5)
Hidden single 1 at (3, 3)
Guess of 3 at (1, 2)
Hidden single 8 at (2, 2)
Hidden single 3 at (0, 3)
Hidden single 7 at (1, 3)
Hidden single 4 at (5, 3)
No candidates at (7, 3)
Backtracking 5 guesses
Guess of 8 at (1, 2)
Hidden single 3 at (2, 2)
Hidden single 2 at (2, 7)
Hidden single 4 at (2, 4)
No candidates at (2, 6)
Backtracking 13 guesses
Guess of 3 at (6, 1)
Hidden single 1 at (8, 1)
Hidden single 1 at (6, 4)
Hidden single 5 at (8, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (3, 8)
Hidden single 5 at (4, 5)
Hidden single 1 at (2, 5)
Hidden single 1 at (3, 3)
Hidden single 3 at (8, 8)
Hidden single 3 at (0, 3)
Hidden single 7 at (1, 3)
Hidden single 4 at (5, 3)
No candidates at (7, 3)
Backtracking 23 guesses
Guess of 9 at (6, 0)
Hidden single 4 at (7, 0)
Hidden single 6 at (8, 0)
Hidden single 3 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 9 at (8, 8)
Hidden single 9 at (1, 7)
Hidden single 9 at (3, 6)
Hidden single 9 at (5, 5)
Hidden single 4 at (2, 6)
Hidden single 4 at (3, 5)
Hidden single 1 at (3, 3)
Hidden single 4 at (5, 8)
Hidden single 5 at (3, 8)
Hidden single 7 at (3, 1)
Hidden single 5 at (5, 1)
Hidden single 7 at (5, 3)
Hidden single 3 at (1, 3)
Hidden single 8 at (1, 2)
Hidden single 3 at (2, 2)
Hidden single 4 at (0, 3)
Hidden single 8 at (6, 3)
Hidden single 1 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 7 at (0, 4)
Hidden single 2 at (4, 4)
Hidden single 4 at (6, 4)
Hidden single 2 at (1, 5)
Hidden single 6 at (4, 5)
Hidden single 3 at (7, 5)
Hidden single 7 at (4, 6)
Hidden single 2 at (7, 6)
Hidden single 2 at (2, 7)
No candidates at (5, 7)
Backtracking 41 guesses
Guess of 4 at (3, 0)
Hidden single 2 at (4, 2)
Hidden single 8 at (5, 0)
Hidden single 1 at (5, 2)
Hidden single 4 at (6, 2)
Hidden single 2 at (2, 4)
Last possible number 3 at (1, 5)
Hidden single 8 at (1, 2)
Hidden single 3 at (2, 2)
No candidates at (2, 7)
Backtracking 13 guesses
Guess of 6 at (0, 0)
Hidden single 6 at (2, 7)
Guess of 5 at (1, 0)
Guess of 1 at (8, 0)
Hidden single 9 at (6, 0)
Hidden single 5 at (8, 4)
Hidden single 5 at (2, 5)
Hidden single 5 at (4, 3)
Hidden single 6 at (4, 5)
Hidden single 6 at (7, 3)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 1 at (2, 1)
Hidden single 1 at (5, 2)
Hidden single 8 at (5, 0)
Hidden single 1 at (6, 4)
Hidden single 1 at (0, 3)
Hidden single 1 at (3, 5)
Hidden single 9 at (5, 5)
Hidden single 2 at (4, 4)
Hidden single 2 at (3, 0)
Hidden single 4 at (7, 0)
Hidden single 4 at (4, 2)
Hidden single 2 at (6, 2)
No candidates at (6, 6)
Backtracking 23 guesses
Guess of 9 at (8, 0)
Guess of 3 at (1, 2)
Hidden single 7 at (1, 3)
Hidden single 7 at (4, 4)
Hidden single 2 at (1, 5)
Hidden single 9 at (1, 7)
Hidden single 9 at (6, 6)
Hidden single 8 at (1, 8)
Guess of 1 at (2, 1)
Hidden single 8 at (2, 2)
Guess of 5 at (3, 1)
Hidden single 7 at (5, 1)
Hidden single 8 at (5, 0)
Guess of 2 at (7, 0)
Hidden single 2 at (6, 7)
Hidden single 5 at (5, 7)
Hidden single 5 at (8, 8)
Last possible number 1 at (8, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (3, 3)
No candidates at (5, 3)
Backtracking 7 guesses
Guess of 4 at (7, 0)
Guess of 1 at (3, 0)
Hidden single 2 at (6, 0)
Hidden single 1 at (6, 2)
Last possible number 4 at (3, 3)
Hidden single 4 at (6, 4)
Hidden single 1 at (0, 4)
Hidden single 3 at (0, 3)
Hidden single 5 at (2, 4)
No candidates at (8, 4)
Backtracking 8 guesses
Guess of 2 at (3, 0)
Hidden single 1 at (6, 0)
Hidden single 4 at (4, 2)
Hidden single 1 at (5, 2)
Hidden single 2 at (6, 2)
Hidden single 2 at (4, 6)
Hidden single 5 at (5, 7)
Hidden single 4 at (5, 3)
Hidden single 1 at (3, 3)
Hidden single 3 at (0, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (8, 4)
Hidden single 8 at (6, 3)
Hidden single 3 at (6, 1)
No candidates at (6, 7)
Backtracking 18 guesses
Guess of 7 at (3, 1)
Hidden single 5 at (5, 1)
Hidden single 8 at (5, 0)
Hidden single 7 at (7, 6)
Guess of 2 at (7, 0)
Hidden single 2 at (6, 7)
Hidden single 7 at (5, 7)
Hidden single 3 at (0, 7)
Hidden single 3 at (2, 5)
Hidden single 5 at (2, 4)
Hidden single 1 at (8, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 5 at (3, 3)
No candidates at (3, 7)
Backtracking 10 guesses
Guess of 4 at (7, 0)
Hidden single 2 at (7, 8)
Hidden single 2 at (2, 6)
Hidden single 2 at (4, 2)
Hidden single 1 at (3, 0)
Hidden single 2 at (6, 0)
Hidden single 4 at (5, 2)
Hidden single 1 at (6, 2)
Hidden single 1 at (5, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (8, 4)
Hidden single 4 at (2, 4)
No candidates at (6, 4)
Backtracking 18 guesses
Guess of 8 at (2, 1)
Hidden single 1 at (2, 2)
Guess of 1 at (6, 1)
Guess of 5 at (3, 1)
Hidden single 7 at (5, 1)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Guess of 2 at (4, 2)
Last possible number 4 at (4, 6)
Guess of 1 at (3, 0)
Last possible number 4 at (3, 3)
Last possible number 9 at (3, 5)
Hidden single 9 at (5, 8)
Hidden single 5 at (5, 7)
Hidden single 1 at (5, 3)
No candidates at (5, 5)
Backtracking 6 guesses
Guess of 4 at (3, 0)
Hidden single 1 at (5, 0)
Hidden single 8 at (5, 2)
Hidden single 4 at (6, 2)
Last possible number 1 at (3, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (6, 4)
No candidates at (8, 4)
Backtracking 9 guesses
Guess of 4 at (4, 2)
Hidden single 2 at (4, 6)
Hidden single 7 at (7, 6)
Hidden single 5 at (5, 7)
Hidden single 2 at (2, 8)
No candidates at (7, 8)
Backtracking 7 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 6 at (8, 5)
Hidden single 6 at (4, 3)
Hidden single 1 at (8, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (3, 3)
Hidden single 5 at (5, 3)
No candidates at (4, 5)
Backtracking 10 guesses
Guess of 7 at (3, 1)
Hidden single 5 at (5, 1)
Hidden single 7 at (7, 6)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Last possible number 2 at (7, 8)
Hidden single 2 at (2, 6)
Hidden single 2 at (4, 2)
Hidden single 2 at (6, 0)
Hidden single 4 at (4, 6)
Hidden single 3 at (3, 6)
Hidden single 2 at (3, 7)
Hidden single 7 at (5, 7)
Hidden single 3 at (0, 7)
Hidden single 3 at (2, 5)
Hidden single 5 at (2, 4)
Hidden single 3 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 4 at (7, 0)
Hidden single 1 at (3, 0)
Hidden single 8 at (5, 0)
Hidden single 4 at (5, 2)
Hidden single 8 at (6, 2)
Hidden single 4 at (0, 3)
Hidden single 5 at (3, 3)
Hidden single 6 at (4, 3)
No candidates at (4, 5)
Backtracking 23 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 6 at (8, 5)
Hidden single 6 at (4, 3)
Hidden single 1 at (8, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 5 at (3, 3)
No candidates at (4, 5)
Backtracking 12 guesses
Guess of 3 at (6, 1)
Last possible number 6 at (7, 1)
Hidden single 1 at (8, 1)
Hidden single 5 at (8, 4)
Hidden single 4 at (2, 4)
Hidden single 1 at (0, 4)
No candidates at (6, 4)
Backtracking 15 guesses
Guess of 8 at (1, 2)
Hidden single 8 at (2, 8)
Guess of 1 at (2, 1)
Hidden single 3 at (2, 2)
Guess of 5 at (3, 1)
Hidden single 7 at (5, 1)
Hidden single 8 at (5, 0)
Guess of 2 at (7, 0)
Guess of 1 at (3, 0)
Hidden single 4 at (6, 0)
Hidden single 1 at (6, 2)
Last possible number 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 5 at (8, 8)
Hidden single 5 at (5, 7)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 7 at (3, 3)
Hidden single 3 at (1, 3)
Hidden single 8 at (6, 3)
Hidden single 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 2 at (4, 4)
Hidden single 4 at (2, 4)
Hidden single 7 at (0, 4)
Hidden single 2 at (1, 5)
Hidden single 5 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (5, 5)
Hidden single 4 at (7, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
Hidden single 9 at (6, 6)
Hidden single 3 at (7, 6)
Hidden single 4 at (3, 6)
Hidden single 3 at (0, 7)
Hidden single 2 at (3, 7)
No candidates at (6, 7)
Backtracking 36 guesses
Guess of 4 at (3, 0)
Hidden single 1 at (6, 0)
Hidden single 2 at (4, 2)
Hidden single 1 at (5, 2)
Hidden single 4 at (6, 2)
Hidden single 2 at (2, 4)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 3 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 1 at (3, 3)
Hidden single 4 at (0, 3)
No candidates at (0, 4)
Backtracking 13 guesses
Guess of 4 at (7, 0)
Guess of 1 at (3, 0)
Hidden single 2 at (6, 0)
Hidden single 1 at (6, 2)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (5, 8)
Hidden single 5 at (4, 3)
Hidden single 6 at (4, 5)
Hidden single 6 at (7, 3)
Last possible number 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 5 at (2, 4)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 7 at (3, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 29 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (7, 3)
Hidden single 6 at (4, 3)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 5)
Guess of 2 at (4, 2)
Hidden single 4 at (5, 2)
Hidden single 2 at (2, 4)
Hidden single 3 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 4 at (3, 3)
Hidden single 1 at (0, 3)
Hidden single 5 at (5, 3)
No candidates at (4, 5)
Backtracking 8 guesses
Guess of 4 at (4, 2)
Hidden single 2 at (5, 2)
Guess of 3 at (1, 3)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (3, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (4, 5)
Hidden single 4 at (5, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 18 guesses
Guess of 7 at (1, 3)
Hidden single 4 at (3, 3)
Hidden single 7 at (4, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (0, 4)
Hidden single 3 at (0, 3)
Hidden single 5 at (6, 3)
No candidates at (8, 4)
Backtracking 12 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 7 at (3, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (4, 5)
Hidden single 4 at (5, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 6 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 29 guesses
Guess of 2 at (3, 0)
Hidden single 1 at (6, 0)
Hidden single 4 at (4, 2)
Hidden single 1 at (5, 2)
Hidden single 2 at (6, 2)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (5, 8)
Hidden single 5 at (4, 3)
Hidden single 4 at (5, 3)
Hidden single 4 at (2, 5)
Hidden single 5 at (2, 4)
Hidden single 1 at (8, 4)
Hidden single 7 at (0, 4)
Hidden single 3 at (1, 3)
Hidden single 1 at (0, 3)
Hidden single 7 at (3, 3)
Hidden single 6 at (7, 3)
Hidden single 2 at (4, 4)
Hidden single 2 at (1, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (3, 5)
Hidden single 9 at (5, 5)
Hidden single 3 at (7, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 27 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (7, 3)
Hidden single 6 at (4, 3)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 5)
Guess of 3 at (1, 3)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (3, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 1 at (3, 5)
Hidden single 5 at (4, 5)
Hidden single 4 at (5, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (5, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 18 guesses
Guess of 7 at (1, 3)
Hidden single 7 at (4, 4)
Hidden single 2 at (2, 4)
Hidden single 3 at (1, 5)
Hidden single 5 at (2, 5)
Hidden single 5 at (5, 3)
Hidden single 3 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 4 at (0, 3)
Hidden single 1 at (3, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (8, 4)
Hidden single 2 at (4, 5)
No candidates at (4, 6)
Backtracking 16 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (3, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 1 at (3, 5)
Hidden single 5 at (4, 5)
Hidden single 4 at (5, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (5, 5)
Hidden single 6 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 33 guesses
Guess of 7 at (3, 1)
Hidden single 5 at (5, 1)
Hidden single 8 at (5, 0)
Guess of 2 at (7, 0)
Guess of 1 at (3, 0)
Hidden single 4 at (6, 0)
Hidden single 1 at (6, 2)
Last possible number 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 5 at (8, 8)
Hidden single 5 at (3, 7)
Hidden single 1 at (0, 3)
Hidden single 4 at (3, 3)
Hidden single 7 at (5, 3)
Hidden single 3 at (1, 3)
Hidden single 8 at (6, 3)
Hidden single 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 4 at (2, 4)
Hidden single 7 at (0, 4)
Hidden single 2 at (1, 5)
Hidden single 5 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (5, 5)
Hidden single 4 at (7, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 3 at (3, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 32 guesses
Guess of 4 at (3, 0)
Hidden single 1 at (6, 0)
Hidden single 2 at (4, 2)
Hidden single 1 at (5, 2)
Hidden single 4 at (6, 2)
Hidden single 2 at (2, 4)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 3 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 4 at (5, 3)
Hidden single 1 at (0, 3)
Hidden single 5 at (3, 3)
Hidden single 6 at (4, 3)
No candidates at (4, 5)
Backtracking 15 guesses
Guess of 4 at (7, 0)
Guess of 1 at (3, 0)
Hidden single 2 at (6, 0)
Hidden single 1 at (6, 2)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (3, 8)
Hidden single 4 at (3, 3)
Hidden single 4 at (2, 5)
Hidden single 5 at (2, 4)
Hidden single 1 at (8, 4)
Hidden single 7 at (0, 4)
Hidden single 3 at (1, 3)
Hidden single 1 at (0, 3)
Hidden single 7 at (5, 3)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 2 at (1, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (5, 5)
Hidden single 3 at (7, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 3 at (3, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 30 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (7, 3)
Hidden single 6 at (4, 3)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 5)
Guess of 2 at (4, 2)
Hidden single 4 at (5, 2)
Hidden single 2 at (2, 4)
Hidden single 3 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 1 at (5, 3)
Hidden single 4 at (0, 3)
Hidden single 5 at (3, 3)
Hidden single 3 at (6, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (8, 4)
Hidden single 4 at (6, 4)
Hidden single 7 at (4, 4)
Hidden single 5 at (2, 5)
Hidden single 4 at (4, 5)
No candidates at (4, 6)
Backtracking 15 guesses
Guess of 4 at (4, 2)
Hidden single 2 at (5, 2)
Guess of 3 at (1, 3)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (5, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (4, 5)
Hidden single 4 at (3, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 3 at (3, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 19 guesses
Guess of 7 at (1, 3)
Hidden single 7 at (4, 4)
Hidden single 2 at (2, 4)
Hidden single 3 at (1, 5)
Hidden single 5 at (2, 5)
Hidden single 5 at (3, 3)
Hidden single 3 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 4 at (0, 3)
Hidden single 1 at (5, 3)
Hidden single 1 at (0, 4)
Hidden single 5 at (8, 4)
Hidden single 2 at (4, 5)
No candidates at (4, 6)
Backtracking 18 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 7 at (5, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (4, 5)
Hidden single 4 at (3, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 6 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 3 at (3, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 30 guesses
Guess of 2 at (3, 0)
Hidden single 1 at (6, 0)
Hidden single 4 at (4, 2)
Hidden single 1 at (5, 2)
Hidden single 2 at (6, 2)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Hidden single 5 at (3, 8)
Hidden single 5 at (4, 3)
Hidden single 6 at (4, 5)
Hidden single 6 at (7, 3)
Last possible number 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 5 at (2, 4)
Hidden single 2 at (4, 4)
Hidden single 7 at (5, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (3, 3)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 1 at (3, 5)
Hidden single 9 at (5, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 3 at (3, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 28 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (7, 3)
Hidden single 6 at (4, 3)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 5)
Guess of 3 at (1, 3)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (5, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 1 at (3, 5)
Hidden single 5 at (4, 5)
Hidden single 4 at (3, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (5, 5)
Hidden single 3 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 18 guesses
Guess of 7 at (1, 3)
Hidden single 4 at (5, 3)
Hidden single 7 at (4, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (0, 4)
Hidden single 3 at (0, 3)
Hidden single 5 at (6, 3)
No candidates at (8, 4)
Backtracking 10 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 3 at (7, 5)
Hidden single 2 at (1, 5)
Hidden single 2 at (4, 4)
Hidden single 7 at (5, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 1 at (3, 5)
Hidden single 5 at (4, 5)
Hidden single 4 at (3, 3)
Hidden single 5 at (6, 3)
Hidden single 5 at (2, 4)
Hidden single 4 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (5, 5)
Hidden single 6 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 35 guesses
Guess of 3 at (2, 1)
Hidden single 1 at (2, 2)
Hidden single 3 at (6, 2)
Guess of 1 at (6, 1)
Last possible number 6 at (8, 1)
Last possible number 8 at (7, 1)
Hidden single 8 at (5, 0)
Hidden single 1 at (3, 0)
Hidden single 8 at (6, 3)
Guess of 2 at (6, 0)
Hidden single 4 at (7, 0)
Hidden single 4 at (6, 4)
Hidden single 9 at (6, 6)
Hidden single 5 at (6, 7)
Last possible number 3 at (8, 8)
Hidden single 3 at (3, 6)
Guess of 5 at (3, 1)
Hidden single 7 at (5, 1)
Hidden single 5 at (5, 8)
Hidden single 5 at (4, 3)
Hidden single 6 at (4, 5)
Hidden single 6 at (7, 3)
Hidden single 3 at (7, 5)
Last possible number 2 at (1, 5)
Hidden single 5 at (2, 4)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 7 at (3, 3)
Hidden single 3 at (1, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 1 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 1 at (5, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 24 guesses
Guess of 7 at (3, 1)
Hidden single 5 at (5, 1)
Hidden single 5 at (3, 8)
Hidden single 4 at (3, 3)
Hidden single 4 at (2, 5)
Hidden single 5 at (2, 4)
Hidden single 1 at (8, 4)
Hidden single 7 at (0, 4)
Hidden single 3 at (1, 3)
Hidden single 1 at (0, 3)
Hidden single 7 at (5, 3)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 2 at (1, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (5, 5)
Hidden single 3 at (7, 5)
Hidden single 5 at (8, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
No candidates at (7, 6)
Backtracking 31 guesses
Guess of 4 at (6, 0)
Hidden single 2 at (7, 0)
Last possible number 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 3 at (8, 5)
Hidden single 2 at (1, 5)
Hidden single 4 at (2, 4)
Hidden single 7 at (0, 4)
Hidden single 3 at (1, 3)
Hidden single 1 at (0, 3)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 5 at (2, 5)
Hidden single 6 at (4, 5)
Hidden single 1 at (5, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (7, 3)
Hidden single 4 at (7, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
Hidden single 5 at (4, 3)
Hidden single 9 at (6, 6)
Hidden single 3 at (7, 6)
Hidden single 4 at (3, 6)
Hidden single 7 at (3, 3)
Hidden single 5 at (3, 1)
Hidden single 7 at (5, 1)
Hidden single 4 at (5, 3)
Hidden single 3 at (0, 7)
Hidden single 2 at (3, 7)
No candidates at (6, 7)
Backtracking 37 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (5, 0)
Hidden single 6 at (7, 1)
Hidden single 1 at (8, 1)
Hidden single 1 at (3, 0)
Hidden single 5 at (8, 4)
Hidden single 5 at (2, 5)
Hidden single 5 at (6, 7)
Hidden single 9 at (6, 6)
Hidden single 5 at (4, 3)
Hidden single 6 at (4, 5)
Hidden single 8 at (7, 3)
Hidden single 1 at (5, 5)
Hidden single 9 at (3, 5)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 4 at (2, 4)
Hidden single 1 at (6, 4)
Hidden single 4 at (6, 3)
Hidden single 2 at (6, 0)
Hidden single 4 at (7, 0)
Hidden single 7 at (3, 3)
No candidates at (5, 3)
Backtracking 30 guesses
Guess of 8 at (1, 0)
Hidden single 5 at (2, 1)
Hidden single 3 at (1, 2)
Hidden single 1 at (2, 2)
Hidden single 8 at (2, 8)
Guess of 2 at (7, 0)
Guess of 1 at (8, 0)
Hidden single 9 at (6, 0)
Hidden single 4 at (6, 2)
Hidden single 2 at (4, 2)
Hidden single 8 at (5, 2)
Hidden single 5 at (8, 4)
Hidden single 2 at (2, 4)
Hidden single 1 at (6, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 4 at (0, 4)
Hidden single 7 at (4, 4)
Hidden single 3 at (2, 5)
Hidden single 6 at (8, 5)
Hidden single 6 at (7, 1)
Hidden single 8 at (6, 1)
Hidden single 3 at (8, 1)
Hidden single 6 at (4, 3)
Hidden single 3 at (6, 3)
Hidden single 8 at (7, 3)
Hidden single 4 at (4, 5)
No candidates at (7, 5)
Backtracking 22 guesses
Guess of 9 at (8, 0)
Guess of 1 at (6, 0)
Hidden single 4 at (6, 2)
Hidden single 2 at (4, 2)
Hidden single 8 at (5, 2)
Hidden single 2 at (2, 4)
Last possible number 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 1 at (0, 3)
Hidden single 5 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 4 at (0, 4)
Hidden single 7 at (4, 4)
Hidden single 3 at (2, 5)
Hidden single 6 at (8, 5)
Hidden single 6 at (7, 1)
Hidden single 8 at (6, 1)
Hidden single 3 at (8, 1)
Hidden single 6 at (4, 3)
Hidden single 3 at (6, 3)
Hidden single 8 at (7, 3)
Hidden single 4 at (4, 5)
No candidates at (7, 5)
Backtracking 21 guesses
Guess of 4 at (6, 0)
Last possible number 8 at (6, 2)
Hidden single 8 at (5, 1)
Hidden single 7 at (3, 1)
Hidden single 8 at (7, 3)
Hidden single 4 at (7, 5)
Hidden single 6 at (8, 5)
Hidden single 6 at (7, 1)
Hidden single 6 at (4, 3)
Hidden single 3 at (6, 3)
Hidden single 1 at (6, 1)
Hidden single 3 at (8, 1)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
Hidden single 5 at (8, 8)
Hidden single 1 at (0, 3)
Hidden single 3 at (2, 5)
Hidden single 5 at (4, 5)
Hidden single 5 at (1, 3)
Hidden single 4 at (3, 3)
Hidden single 7 at (5, 3)
Hidden single 7 at (0, 4)
Hidden single 4 at (2, 4)
Hidden single 2 at (4, 4)
Hidden single 4 at (4, 2)
Hidden single 2 at (5, 2)
Hidden single 2 at (1, 5)
Hidden single 2 at (2, 6)
Hidden single 7 at (4, 6)
Hidden single 9 at (6, 6)
Hidden single 3 at (3, 6)
No candidates at (7, 6)
Backtracking 33 guesses
Guess of 4 at (7, 0)
Guess of 1 at (8, 0)
Hidden single 9 at (6, 0)
Hidden single 2 at (6, 2)
Hidden single 4 at (4, 2)
Hidden single 8 at (5, 2)
Hidden single 5 at (8, 4)
Hidden single 9 at (3, 6)
Hidden single 9 at (5, 5)
Hidden single 1 at (3, 5)
Hidden single 7 at (3, 1)
Hidden single 1 at (5, 1)
Hidden single 4 at (2, 5)
Hidden single 3 at (0, 3)
Hidden single 1 at (0, 4)
Hidden single 7 at (1, 3)
Hidden single 2 at (2, 4)
Hidden single 7 at (4, 4)
Hidden single 4 at (6, 4)
Hidden single 5 at (1, 5)
Hidden single 2 at (4, 5)
No candidates at (4, 6)
Backtracking 20 guesses
Guess of 9 at (8, 0)
Guess of 1 at (6, 0)
Hidden single 2 at (6, 2)
Hidden single 4 at (4, 2)
Hidden single 8 at (5, 2)
Guess of 2 at (3, 0)
Hidden single 5 at (5, 0)
Guess of 1 at (3, 1)
Hidden single 7 at (5, 1)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 2 at (2, 4)
Hidden single 5 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 1 at (0, 4)
Hidden single 7 at (4, 4)
Hidden single 1 at (5, 3)
Hidden single 5 at (8, 4)
Hidden single 1 at (8, 5)
Hidden single 2 at (4, 6)
Hidden single 6 at (4, 5)
Hidden single 5 at (4, 3)
Hidden single 4 at (3, 3)
Hidden single 3 at (0, 3)
Hidden single 6 at (7, 3)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 2 at (5, 5)
Hidden single 3 at (7, 5)
Hidden single 3 at (2, 6)
Hidden single 7 at (3, 6)
No candidates at (7, 6)
Backtracking 25 guesses
Guess of 8 at (6, 1)
Hidden single 8 at (7, 3)
Hidden single 6 at (4, 3)
Guess of 3 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 6 at (7, 5)
Guess of 5 at (1, 3)
Last possible number 2 at (1, 5)
Hidden single 4 at (2, 4)
Hidden single 2 at (4, 4)
Hidden single 7 at (3, 3)
Hidden single 7 at (0, 4)
Hidden single 1 at (0, 3)
Hidden single 4 at (5, 3)
Hidden single 3 at (6, 3)
Hidden single 5 at (6, 4)
Hidden single 1 at (8, 4)
No candidates at (8, 5)
Backtracking 11 guesses
Guess of 7 at (1, 3)
Hidden single 5 at (1, 5)
Hidden single 7 at (4, 4)
Hidden single 5 at (3, 3)
Hidden single 2 at (2, 4)
Hidden single 2 at (4, 5)
No candidates at (4, 6)
Backtracking 9 guesses
Guess of 6 at (7, 1)
Hidden single 3 at (8, 1)
Hidden single 3 at (7, 5)
Hidden single 3 at (0, 3)
Hidden single 1 at (0, 4)
Hidden single 7 at (1, 3)
Hidden single 5 at (8, 4)
No candidates at (8, 8)
Backtracking 12 guesses
Guess of 7 at (3, 1)
Hidden single 1 at (5, 1)
Guess of 3 at (6, 1)
Hidden single 8 at (7, 1)
Hidden single 6 at (8, 1)
Hidden single 8 at (6, 3)
Hidden single 4 at (6, 4)
Hidden single 2 at (2, 4)
Hidden single 5 at (1, 5)
Hidden single 7 at (1, 3)
Hidden single 4 at (5, 3)
Hidden single 1 at (0, 4)
Hidden single 3 at (0, 3)
Hidden single 6 at (7, 3)
Hidden single 5 at (4, 3)
Hidden single 1 at (3, 3)
Hidden single 7 at (4, 4)
Hidden single 5 at (8, 4)
Hidden single 4 at (2, 5)
Hidden single 9 at (3, 5)
Hidden single 6 at (4, 5)
Hidden single 2 at (5, 5)
Hidden single 3 at (7, 5)
Hidden single 1 at (8, 5)
Hidden single 3 at (2, 6)
Hidden single 4 at (3, 6)
Hidden single 2 at (4, 6)
Hidden single 9 at (6, 6)
Hidden single 7 at (7, 6)
Hidden single 7 at (0, 7)
Hidden single 9 at (5, 7)
Hidden single 2 at (1, 7)
Hidden single 5 at (6, 7)
Hidden single 3 at (3, 7)
Hidden single 4 at (0, 8)
Hidden single 9 at (1, 8)
Hidden single 5 at (3, 8)
Hidden single 7 at (5, 8)
Hidden single 2 at (7, 8)
Hidden single 3 at (8, 8)

Solved in 28μs with 2,243 steps taken.

 ┌───────┬───────┬───────┐
 │ 6 8 7 │ 2 3 5 │ 1 4 9 │
 │ 2 4 5 │ 7 9 1 │ 3 8 6 │
 │ 9 3 1 │ 6 4 8 │ 2 5 7 │
 ├───────┼───────┼───────┤
 │ 3 7 9 │ 1 5 4 │ 8 6 2 │
 │ 1 6 2 │ 8 7 3 │ 4 9 5 │
 │ 8 5 4 │ 9 6 2 │ 7 3 1 │
 ├───────┼───────┼───────┤
 │ 5 1 3 │ 4 2 6 │ 9 7 8 │
 │ 7 2 6 │ 3 8 9 │ 5 1 4 │
 │ 4 9 8 │ 5 1 7 │ 6 2 3 │
 └───────┴───────┴───────┘

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