If your code still does not pass the CodeHS autograder, check these final three details:
By understanding the common pitfalls and implementing the strategies outlined in this guide, you can successfully complete the assignment and build a solid foundation for more advanced programming challenges. Remember that the checkerboard pattern is not just an isolated exercise—it's a building block for more complex projects like game boards, pixel art generators, and graphical user interfaces.
# --- Setup --- t = turtle.Turtle() t.speed(0) # Set speed to fastest t.hideturtle() 916 checkerboard v1 codehs fixed
Pass your modified board variable into the print_board() function already provided in the CodeHS editor to see the visual output and pass the test cases. Common Troubleshooting Tips
Create a checkerboard with 8 rows and 8 columns, with alternating black and white squares. If your code still does not pass the
For an 8x8 grid, your program should print or store data that visualizes like this:
Introduction The CodeHS JavaScript simulation "9.1.6 Checkerboard v1" challenges developers to create a grid of alternating colored squares. Solving this requires a strong grasp of nested loops, coordinate geometry, and grid boundaries. Common Troubleshooting Tips Create a checkerboard with 8
# Function to print the board def print_board(board): for row in board: # Join elements with a space for proper formatting print(" ".join([str(x) for x in row])) # 1. Initialize an 8x8 board with all zeros board = [] for i in range(8): board.append([0] * 8) # 2. Use nested loops to assign 1s to specific indices # Row indices 0, 1, 2 are the top three rows # Row indices 5, 6, 7 are the bottom three rows for row in range(8): for col in range(8): # Check if the row should have pieces if row < 3 or row > 4: # Only set to 1 if (row + col) is even to create the pattern if (row + col) % 2 == 0: board[row][col] = 1 # 3. Display the final board print_board(board) Use code with caution. Copied to clipboard Key Logic & Fixes 💡
This report outlines the correct approach to solving the 916 Checkerboard assignment. The "Fixed" aspect focuses on proper loop management. Using for loops is the cleaner solution, but if while loops are required, ensuring the counter variable decrements ( count -= 1 ) is the critical step to prevent an infinite loop crash. The code provided above will successfully draw an 8x8 alternating color grid.
CodeHS often uses a custom GraphicsProgram class. Here is the for 9.1.6 Checkerboard (v1) in Java:
The assignment usually provides this function. It accepts a 2D list ( board ) and prints it in the required grid format.
