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# Thinking in logical relations

Now that we are well versed with the various constructs from the `core.logic` library, let's look at some real world problems that can be solved through logic programming.

## Solving the n-queens problem

The n-queens problem is an interesting problem that can be implemented using logical relations. The objective of the n-queens problem is to place n queens on an n x n sized chessboard such that no two queens are a threat to each other. This problem is a generalization of the eight queens problem published by Max Bezzel in 1848, which involves eight queens. In fact, we can actually solve the n-queens problem for any number of queens, as long as we are dealing with four or more queens. Traditionally, this problem can be ...

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