916 Checkerboard V1 Codehs Fixed Jun 2026

If you would like to debug a specific error message you are receiving, please share the or the canvas dimensions required by your teacher. Share public link

for row in range(8): # Start with a new empty row current_row = []

The autograder often fails students who simply print the pattern; it strictly requires that you initialize a board of 0s and then use assignment statements (e.g., board[i][j] = 1 ) to place pieces. Fixed Python Solution

To fix the common autograder "assignment" error, you must first create a grid of zeros and then use nested loops to change the top and bottom three rows to grid[row][col] = 1 Need help with Checkerboard v2 or applying the modulus operator for alternating patterns?

# Check if we are in the top 3 or bottom 3 rows (indices 0,1,2 and 5,6,7) if row < 3 or row > 4: # Loop through each of the 8 columns for col in range(8): # The (row + col) % 2 condition creates the checkerboard pattern if (row + col) % 2 == 0: current_row.append(1) else: current_row.append(0) else: # Fill the middle rows (indices 3 and 4) with 8 zeros for col in range(8): current_row.append(0) 916 checkerboard v1 codehs fixed

The system wants to see you access a specific spot in a 2D list (e.g., board[i][j] = 1 The Solution: Step-by-Step Fix

If you encounter problems, use this debugging guide to find your specific issue.

: An outer loop controls the rows (vertical movement), while an inner loop handles the columns (horizontal movement).

If the sum of the row and column is (i + j = even), you place a 1. If you would like to debug a specific

Using this mathematical rule ensures that when you move down to the next row, the pattern automatically offsets itself without requiring complex tracking variables. The Fixed Code Implementation

What are you using? (JavaScript or Java Karel?)

# Starting position (Bottom-left or Top-left depending on preference) # Here we start from top-left for standard drawing order start_x = -200 start_y = 200

// CodeHS 9.1.6 Checkerboard v1 - Fixed Solution public void run() // Define the dimensions of your board int totalRows = 8; int totalCols = 8; // Nested loop to traverse the grid for (int row = 0; row < totalRows; row++) for (int col = 0; col < totalCols; col++) // Apply the coordinate sum logic if ((row + col) % 2 == 0) // Action: Place your checkerboard piece or color here drawSquare(row, col); else // Action: Leave blank or place alternative piece skipSquare(row, col); Use code with caution. Common Bugs in 9.1.6 and How to Fix Them # Check if we are in the top

: Squares don't line up correctly or overlap strangely.

Do you need to modify this code to use instead of integers?

if ((row + col) % 2 == 0)