How to move around with a keyboard on IOS

Hi,
Does anyone know how to move up and down using a keyboard on IOS or IpadOS. I'm not looking to swipe up or down, but to do the equivillant of moving your finger up or down.
Problem I'm having is, I'm trying to play chess or the "playgrounds" of IpadOS, and when I'm in a grid, I can't move via rows in the grid.
Any suggestions?
PS: turning full keboard access on actually sems to break things, more than solve things in regards to what I'm trying to do.