9.1.7 Checkerboard V2 Codehs May 2026

This essay explores the logic and implementation of the Checkerboard V2 challenge in the CodeHS 9.1.7 curriculum

1. The board size is variable (e.g., a ROWS and COLUMNS constant, or user input).
2. You must use a single nested loop and decide square color based on (row + column) % 2.

Master this, and you have unlocked a fundamental pattern used in game development, graphics programming, and algorithm design.

var x = col * SQUARE_SIZE; var y = row * SQUARE_SIZE; var square = new Rectangle(SQUARE_SIZE, SQUARE_SIZE); square.setPosition(x, y); // The "Checkerboard" Logic if ((row + col) % 2 == 0) square.setColor(COLOR_ONE); else square.setColor(COLOR_TWO); add(square); Use code with caution. Common Pitfalls to Avoid

Final Tips

• Run your code after writing just the outer loop to avoid debugging too much at once.
• If squares overlap, check that you’re multiplying SQUARE_SIZE correctly.
• If colors are wrong, test your modulo logic with a print statement: System.out.println((row+col)%2);

Since I can't see your specific assignment screen, I'll provide a general solution and explanation for drawing a checkerboard pattern, which is a common exercise in CodeHS's JavaScript Graphics unit.

If (row + column) % 2 == 0 → Color A.
If (row + column) % 2 == 1 → Color B.