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Challenges 8 coexisting queens

This is a fixed output challenge. Output a textual representation of a chessboard hosting 8 queens, none of which are attacking each other. There are 92 ways of arranging them, 12 if rotations and...

5 answers  ·  posted 2y ago by trichoplax‭  ·  last activity 1y ago by m90‭

#1: Initial revision by user avatar trichoplax‭ · 2022-09-29T12:13:45Z (about 2 years ago)
8 coexisting queens
This is a fixed output challenge. Output a textual representation of a chessboard hosting 8 queens, none of which are attacking each other.

There are 92 ways of arranging them, 12 if rotations and reflections are discounted. You may choose any 1 of these arrangements.

You are not required to calculate or search for a valid arrangement. Hardcoding your choice of arrangement is one possible valid solution.

## Input
- There is no input for this challenge

## Output
- 8 newline separated lines of 8 characters, with an optional trailing newline
- Each character is either a queen or an empty square. You may choose any two distinct characters to represent a queen and an empty square
- No more than 1 queen appears in each row, column, and diagonal
- There are 8 queens in total
- Your output must be the same each time (your code must have deterministic output, even if it uses a probabilistic approach internally)

## Examples
The examples show a queen as `Q` and an empty square as `#`. There are 12 examples, one for each of the fundamental solutions (before rotation and reflection). Any combination of rotating and reflecting one of these examples is also a valid solution.

```text
###Q####
######Q#
##Q#####
#######Q
#Q######
####Q###
Q#######
#####Q##

####Q###
#Q######
###Q####
######Q#
##Q#####
#######Q
#####Q##
Q#######

###Q####
#Q######
######Q#
##Q#####
#####Q##
#######Q
####Q###
Q#######

###Q####
#####Q##
#######Q
##Q#####
Q#######
######Q#
####Q###
#Q######

##Q#####
#####Q##
#######Q
Q#######
###Q####
######Q#
####Q###
#Q######

####Q###
##Q#####
#######Q
###Q####
######Q#
Q#######
#####Q##
#Q######

####Q###
######Q#
###Q####
Q#######
##Q#####
#######Q
#####Q##
#Q######

###Q####
Q#######
####Q###
#######Q
#####Q##
##Q#####
######Q#
#Q######

##Q#####
#####Q##
###Q####
Q#######
#######Q
####Q###
######Q#
#Q######

#####Q##
#Q######
######Q#
Q#######
###Q####
#######Q
####Q###
##Q#####

###Q####
######Q#
Q#######
#######Q
####Q###
#Q######
#####Q##
##Q#####

#####Q##
###Q####
######Q#
Q#######
#######Q
#Q######
####Q###
##Q#####
```

The 12 fundamental solutions were taken from the [Wikipedia page for the 8 queens puzzle](https://en.wikipedia.org/wiki/Eight_queens_puzzle#Constructing_and_counting_solutions_when_n_=_8) which also provides them as images:

[![The 12 fundamental solutions to the 8 queens puzzle](https://codegolf.codidact.com/uploads/WA6gMm476tdsgfbzPQHTPdUF)](https://en.wikipedia.org/wiki/Eight_queens_puzzle#Constructing_and_counting_solutions_when_n_=_8 "View the images on Wikipedia")

## Scoring
Despite there being 92 valid outputs, this is a standard code golf challenge. Your score is the number of bytes in your code.


> Explanations in answers are optional, but I'm more likely to upvote answers that have one.