Many students fail this one because they try to "shortcut" the board creation by appending pre-made lists. Here’s how to fix your code so it passes every test case. The Problem: Why Your Code Isn't Passing The autograder for this exercise specifically checks for assignment statements
for (int row = 0; row < rows; row++) for (int col = 0; col < cols; col++) Color color = (row + col) % 2 == 0 ? Color.BLACK : Color.WHITE; g.setColor(color); g.fillRect(col * squareSize, row * squareSize, squareSize, squareSize);
For the exercise, the goal is to create an 8x8 grid (a list of lists) where specific rows are populated with 1s to represent checkers and others with 0s to represent empty spaces. The Problem Brief You are required to: Initialize an 8x8 grid filled with 0 s. Use a nested for loop to modify the grid.
(leftIsClear()) turnLeft(); move(); turnLeft(); 916 checkerboard v1 codehs fixed
The autograder often fails if you simply print "1" or use a shortcut. To pass, you must: Initialize an 8x8 grid filled with 0 . Loop through the rows and columns. Update specific elements to 1 using board[i][j] = 1 . Fixed Python Code
This approach uses a nested loop as required by the CodeHS autograder.
, you aren't alone. This exercise is a classic "gotcha" because it doesn't just want the right visual output; it wants you to use specific programming techniques—like nested loops and list indexing—to get there. Many students fail this one because they try
Solved 9.1.6: Checkerboard, v1 Save 1 # Pass this function a
Always insert your row-ending actions (like a line break or moving a turtle graphics pointer down) outside the inner column loop, but inside the outer row loop. Alternative Karel / JavaScript Implementation Note
Do you need the specific Python code snippet for the checkerboard function? post_content Common Troubleshooting Tips
The primary challenge lies in the alternating pattern. It cannot simply alternate every single step, because when a row ends, the next row must start with the correct alternating value to create a grid pattern rather than vertical stripes. The Mathematical Logic
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