[saulpw]

You can be clever and use half-blocks: ♘

[shmageggy]

What's a half-block and how do I use one?

[saulpw]

Sorry, that didn't render. They're U+258C and U+2590. So you put them on either side and each square is rendered across 3 cells, and the 2 outer cells are half-blocks shared with the adjacent squares.

https://en.wikipedia.org/wiki/Block_Elements