Young Board Bbs What's The Name Of The Young Adult Book That Had A Chess Board And 2 Teenagers On The Cover?

What's the name of the young adult book that had a chess board and 2 teenagers on the cover? - young board bbs

It is not Lewis Carroll, but it is almost Alice in Wonderland / Through the Looking Glass. It was written in the late 80s and early 90s. The 2 young people, boys and girls have the expressions on their faces exposed. I think it has a red T-shirt with a blue shirt. I think that is the requirement that the portal of your library that somehow connects with the stories of Alice.