Have you ever played checkers? It's a game where you have a board with little pieces that you move around to try to win. Well, imagine if you had a bigger board and you could move your pieces in a special way that let you jump over your opponent's pieces. That's called "straddling," and it's what a straddling checkerboard is all about.
You see, usually in checkers, you can only move your pieces diagonally. But on a straddling checkerboard, you can move your pieces diagonally *and* horizontally or vertically. And when you move your piece that way, you can "straddle" your opponent's piece and jump over it to capture it.
It's kind of like when you play leapfrog with your friends. You jump over them to get to the other side. That's what you're doing with your checkers pieces on a straddling checkerboard - jumping over your opponent's pieces to win the game.
So, a straddling checkerboard is just a special kind of checkerboard that has extra lines on it so you can move your pieces in a different way and play a more challenging game of checkers. It's a fun way to test your skills and outsmart your opponent!