- Code: Select all
9 . . | . . . | . . 7
. 6 7 | . 5 . | 9 4 .
2 4 . | . . . | . 1 6
-------+-------+-------
. . . | 2 . 7 | . . .
3 . . | . 6 . | . . 2
. . . | 3 . 1 | . . .
-------+-------+-------
7 3 . | . . . | . 5 1
. 5 2 | . 3 . | 6 7 .
6 . . | . . . | . . 4
(Henk Collection, Puzzle #212, rating 25714)
After the basic steps we arrive at the following grid:
- Code: Select all
9 18 35 | 468 148 3468 | 258 28 7
18 6 7 | 18 5 2 | 9 4 3
2 4 35 | 789 789 389 | 58 1 6
----------------+-------------------+---------------
458 189 6 | 2 489 7 | 14 3 589
3 7 1489 | 4589 6 4589 | 14 89 2
458 2 489 | 3 489 1 | 7 6 589
----------------+-------------------+---------------
7 3 489 | 4689 2489 4689 | 28 5 1
148 5 2 | 1489 3 489 | 6 7 89
6 189 189 | 5789 12789 589 | 3 289 4
Now, I am interested to know how the various solvers (humans and computer programs) out there would solve this puzzle from here in a single step. For reference, here is my definition of "single step":
Single Step: a logical deduction with which the puzzle is solved, i. e., a logical deduction from which all other further logical deductions needed to complete the puzzle are the most basic ones: naked and hidden singles, locked candidates, pairs, triples and quads, and eventually X-Wings and type-1 URs, but nothing beyond that (Swordfish, XY-Wing, Colors, etc).
Every contribution is welcome.
Thanks in advance.
Carcul