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Based off of: Ken Duisenberg's Puzzle of the Week Oct. 15, 2003: Minesweeper Queens

For the puzzle, in the given diagram, the numbered squares are empty, from which the given mines can be attacked by a chess queen. As in standard chess, a queen can attack all eight directions, and only one mine in a single direction.

For example:

Place 5 mines:

1 2
4
3

has 4 solutions, one of them being (x represents a mine)

+---+---+---+---+---+
| 1 | x | x | x | 2 |
+---+---+---+---+---+
|   |   | x | 4 |   |
+---+---+---+---+---+
|   |   |   | 3 | x |
+---+---+---+---+---+



To get the $\color{green}✓$:

  • Place 13 mines in this grid
  • Show the steps you took.
+---+---+---+---+---+---+
|   | 4 |   | 4 |   |   |
+---+---+---+---+---+---+
| 4 |   |   |   |   |   |
+---+---+---+---+---+---+
|   |   | 6 |   |   |   |
+---+---+---+---+---+---+
| 5 |   |   |   |   |   |
+---+---+---+---+---+---+
|   |   |   | 5 |   |   |
+---+---+---+---+---+---+
| 3 |   | 4 |   |   |   |
+---+---+---+---+---+---+
$\endgroup$
2
  • $\begingroup$ Are the lines-of-sight blocked by numbers (as if there was a friendly queen standing on each numbered space), or only by mines? $\endgroup$
    – Tim C
    Commented Jan 24 at 0:20
  • $\begingroup$ @TimC Only by mines is my understanding $\endgroup$
    – CrSb0001
    Commented Jan 24 at 2:06

1 Answer 1

2
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Two numbers in the grid are forcing 3 mines:

enter image description here

From this point, I feel like there are many possible paths, just by trying to satisfy each number with the closest mines that don't contradict any other already cleared number. Here's a possible next step with 10 mines:

enter image description here

Now, 5 spots on the right are not seen by any number. Just pick your favourite 3 and place mines in them to reach the required number of 13 mines.

enter image description here

$\endgroup$

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