9.1.7 Checkerboard V2 Codehs -

This essay explores the logic and implementation of the Checkerboard V2 challenge in the CodeHS 9.1.7 curriculum

Off-by-one errors: Ensure your loops start at 0 and end at GRID_SIZE - 1. 9.1.7 Checkerboard V2 Codehs

Understanding the Problem (The "What")

Before writing a single line of code, you must understand the specification. This essay explores the logic and implementation of

: The CodeHS autograder often checks for an "assignment statement" (e.g., grid[i][j] = 1 if (i + j) % 2 == 0:

    # The Logic: Check if the sum of row index and column index is even or odd
    # This creates the alternating pattern on both axes.
    if (i + j) % 2 == 0:
        print("*", end=" ") # Print a star and a space
    else:
        print(" ", end=" ") # Print a space and a space
Coordinate Math: Remember that the x coordinate is determined by the column, while the y coordinate is determined by the row.
Modulo told his first apprentice, "Start with obsidian (0), then pearl (1). Repeat this four times."The apprentice laid out: [0, 1, 0, 1, 0, 1, 0, 1]. 2. Planning the Alternation
The Sum Rule: A more efficient way to calculate the color is to check if the sum of the row and column indices (