Why did Lewis Carroll write about red chess pieces instead of black ones?

Answer 1

Although the traditional colours of Chess pieces are either white or black, other colours can be used so long as they contrast. Some chess sets have red pieces instead of black (I've played a few games with red pieces)

Answer 2

Lewis Carroll decided to write about red chess pieces in "Through the Looking-Glass" to symbolize the opposing nature of the game and to highlight the concept of duality and change, as red is often seen as a contrasting color that stands out. It also added a colorful and imaginative element to his storytelling.