9.1.6 Checkerboard V1 Codehs |best| Jun 2026

Here is a common way to structure the code using list multiplication for simplicity: # Pass this function a list of lists to print it as a grid print_board range(len(board)): # Join elements with a space for readability .join([str(x) board[i]])) # 1. Initialize the empty board # 2. Loop through 8 rows # 3. Add a row of eight 1s for pieces board.append([ # 4. Add a row of eight 0s for empty space board.append([ # 5. Print the final result print_board(board) Use code with caution. Copied to clipboard Common Pitfalls Nested Loops

if (frontIsClear()) move(); col++; else break;

. This ensures that for every row created, the program draws a full set of squares across the screen. The Modulus Strategy 9.1.6 checkerboard v1 codehs

The pattern typically requires specific rows to have alternating values, creating a "checkerboard" effect. It is a fundamental exercise to understand how to manipulate 2D arrays using nested loops. 2. Key Concepts and Techniques

The horizontal position depends entirely on the current column index c . Column 0 starts at , Column 1 starts at , and so on. Here is a common way to structure the

Implementing a grid-based graphics program is a classic milestone in learning computer science. In the CodeHS JavaScript Graphics curriculum, the assignment challenges you to combine loops, nested structures, and geometric math to draw a classic checkerboard pattern on the screen.

Ensure you are using the correct color constants (e.g., Color.BLACK vs Color.black ) depending on your specific CodeHS library version. Add a row of eight 1s for pieces board

The most common mistake is simply "cheating" the output with a print statement. The CodeHS autograder specifically checks for (e.g., board[i][j] = 1 ). If you don't use these, you'll see a red error message: "You should set some elements of your board to 1." .

By understanding the logic and code for the "9.1.6 Checkerboard, v1" exercise, you've taken a significant step toward mastering 2D lists and building the foundation for more complex projects in your Python journey.

CodeHS Exercise 9.1.6 (Checkerboard, v1) requires creating an 8x8 grid, utilizing nested loops to populate top and bottom rows with 1s in alternating positions while leaving middle rows as 0s. The solution initializes a 2D list and applies an assignment statement to update specific cells where the sum of the row and column indices is odd. For detailed code solutions, review the answers at

To draw a grid, you cannot just use a single loop. You need a structure: Outer Loop (Rows): Controls the vertical position ( coordinate). Inner Loop (Columns): Controls the horizontal position ( coordinate) within that specific row.