The white pawn is betwixt the black.
The definition of betwixt is between.
When you are in between two things, this is an example of a time when you are betwixt.
between: archaic except in the phrase betwixt and between, in an intermediate position; neither altogether one nor altogether the other
Origin of betwixtMiddle English bitwix from Old English betwix from be, by + a form related to twegen, twain; -t is unhistoric
Origin of betwixtMiddle English bitwixt from Old English betwix ; see dwo- in Indo-European roots.
- (literary or archaic) Between, specifically between two objects.
From Old English betwēox.