9.1.7 Checkerboard V2 Codehs _best_ [2026]

If you’re working through the CodeHS Java (or JavaScript) Graphics track, you’ve probably reached . This is a classic “level-up” from the basic checkerboard challenge. It’s designed to test your understanding of nested loops, conditional logic, and coordinate math.

The goal of Checkerboard V2 is to create a grid-like pattern of "markers" or "beepers" on a canvas of any size. Unlike the first version, V2 often requires the program to be dynamic—meaning it must work whether the grid is

While specific instructions can change, here is the general approach to the Python logic used in :

: You are managing a list where each element is itself a list (representing a row). Logical Strategy To solve this correctly, follow these general steps: 9.1.7 Checkerboard V2 Codehs

(Creates the square but never calls add(square) )

Inside the inner loop, check the coordinates using (row + col) % 2 == 0 . Standard Code Blueprint

✅ The code generates a list of lists where each inner list represents a row, alternating like this: Row 0 (Even): [1, 0, 1, 0, 1, 0, 1, 0] Row 1 (Odd): [0, 1, 0, 1, 0, 1, 0, 1] ...and so on. If you’re working through the CodeHS Java (or

You must use nested loops and assignment statements to modify an existing grid of zeros. 💻 Implementation (Python)

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SQUARE_SIZE : The pixel width and height of each individual square. 2. Construct the Nested Loop The goal of Checkerboard V2 is to create

Every square on a grid has an (x, y) or (row, col) coordinate: (1,1) (1,2) (2,0) (2,1) (2,2)

s where the numbers alternate in a checkerboard pattern. The key is to use nested loops modulus operator ) to determine if a specific cell should be a based on its row and column indices. The Core Logic

Row 0: B W B W B W B W Row 1: W B W B W B W B Row 2: B W B W B W B W …

: Do not hardcode the loop limits as 8 if the exercise provides variable inputs. Always use board.length for rows and board[r].length for columns to keep the code dynamic.

# Setup the screen and turtle screen = turtle.Screen() screen.setup(500, 500) screen.title("Checkerboard V2")