Mage wrote:Don't understood exactly how you count solving steps.

My solver, and I believe ab's too, counts like this;

1. locate singles (naked or hidden) - but don't place any numbers

2. place all located singles in one sweep

3. rinse and repeat until solved

Your puzzle required 9 such steps. It had the following number of singles per step; 5,8,9,2,6,9,7,10,2

In other words, the opening grid has 5 singles. After placing all of those, the grid now has 8 singles. Place those and you'll have 9 more, etc.

This one appears to need 27 steps:

- Code: Select all
`+-------+-------+-------+`

| 2 . . | 9 8 . | . . . |

| . 7 6 | . . . | . . . |

| . . . | . . . | 4 2 . |

+-------+-------+-------+

| 3 . 8 | . 4 . | . 1 . |

| . . 4 | . 9 . | 3 . . |

| . 6 . | . 2 . | 9 . 4 |

+-------+-------+-------+

| . 3 5 | . . . | . . . |

| . . . | . . . | 8 4 . |

| . . . | . 6 7 | . . 3 |

+-------+-------+-------+

Path "breadth"; 3,1,1,1,1,2,3,1,1,1,1,1,1,2,2,2,1,2,1,2,2,2,5,6,4,5,2