Black-white chess pieces

Black and white chess covering numbers
Game objective:Move the white chess piece to the grid number 1.2.3.4 and the black chess piece to the grid number 6.7.8.9
Only one chess piece is allowed in each number cell

Mobile rules:Each chess piece can move to an adjacent one at a time, or skip adjacent squares with chess pieces
No matter which chess piece, it can only move forward and backward, left and right, not backward
Each grid can only have one chess piece