Codehs Fixed ~upd~ — 916 Checkerboard V1

Struggling with the logic for the Checkerboard problem in Python? I finally got the v1 version passing all test cases! The key was properly nesting the loops and using the modulo operator % to toggle the colors based on the row and column index.

println(row);

Forgetting that radius is half of the diameter . If your circles are 40 pixels wide, you need to move 40 pixels to reach the next center point.

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If you look at the coordinates of a 2D grid (let's call the row index i and the column index j), a distinct pattern emerges when you add them together (i + j). 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

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

Before diving into the code, you must understand exactly what CodeHS requires for the v1 checkerboard. Karel starts at the bottom-left corner (Street 1, Avenue 1) facing East. Your program must paint the world in an alternating grid pattern. Key Constraints and Rules

: Failing to target exactly the top three (indices 0, 1, 2) and bottom three rows (indices 5, 6, 7). 3. The Fixed Solution Strategy Struggling with the logic for the Checkerboard problem

The beauty of the fixed code lies in its use of the for loop. By nesting a column loop inside a row loop, the program efficiently visits every coordinate on the grid. This structure teaches students how computers handle two-dimensional space: not as a continuous canvas, but as a matrix of discrete points defined by x and y coordinates.

This code creates a sharp, red-and-black checkerboard where the top-left square is black.

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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. println(row); Forgetting that radius is half of the

If your circles are overlapping, only appearing on one line, or refusing to alternate colors, you’re in the right place. Here is the logic, the common bugs, and the fixed code to get your checkerboard working perfectly. The Logic Behind the Grid

Here is the completed, "fixed" Python code that correctly initializes the 2D list and applies the correct mathematical pattern:

# 1. Initialize the board with all 0s board = [] for i in range(8): board.append([0] * 8) # 2. Use nested loops to replace 0s with 1s # Goal: Top 3 and bottom 3 rows should have 1s in a checkerboard pattern for row in range(8): for col in range(8): # Check if it's in the top 3 (0-2) or bottom 3 (5-7) rows if row < 3 or row > 4: # Use modulus to create the alternating checkerboard pattern if (row + col) % 2 == 0: board[row][col] = 1 # 3. Print the final board for row in board: print(row) Use code with caution. Copied to clipboard Why this works: