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The solution to the CodeHS 9.1.7: Checkerboard V2 exercise requires creating an 8x8 grid represented by a list of lists, where the values alternate between
The specific requirement for "V2" is usually the dynamic coloring logic.
To create an efficient solution, you need to identify the mathematical pattern.
# Setup the screen and turtle screen = turtle.Screen() screen.setup(500, 500) screen.title("Checkerboard V2")
function start() var size = 40; // size of each square var startX = 0; var startY = 0; for(var row = 0; row < 8; row++) for(var col = 0; col < 8; col++) var x = startX + col * size; var y = startY + row * size; 9.1.7 Checkerboard V2 Codehs
Once you pass 9.1.7, you’re ready for even cooler graphics exercises — like drawing a chessboard with pieces, or an animated checker game.
The core of the pattern is the alternating sequence for each row. You can use Python's list multiplication to create the pattern for a single row, which will be repeated to form the full board:
my_grid = [([0, 1] * 4) if row_num % 2 == 0 else ([1, 0] * 4) for row_num in range(8)] print_board(my_grid)
To help tailor this to your exact assignment, what (e.g., JavaScript or Python) are you using for this exercise? Share public link The solution to the CodeHS 9
The biggest hurdle is determining when to draw which color. You can solve this by adding the current row index and column index together: If (row + col) % 2 === 0 , draw Color A. If (row + col) % 2 !== 0 , draw Color B. Step-by-Step Code Implementation Strategy
: The CodeHS autograder often checks for an "assignment statement" (e.g., grid[i][j] = 1
: Ensure your range() parameters correctly cover indices 0 through 7 for an 8x8 board.
In , you might have created a static 8x8 board. In Checkerboard V2 , the requirements typically change in one of two ways (depending on your school’s version): The core of the pattern is the alternating
Sometimes students write a complex condition like ((row % 2 == 0 && col % 2 == 0) || (row % 2 != 0 && col % 2 != 0)) . This is logically correct but verbose and error-prone. Stick with (row + col) % 2 .
For the CodeHS exercise 9.1.7: Checkerboard, v2 , the objective is to create an grid where the values alternate between in a checkerboard pattern.
GRect square = new GRect(x, y, sqWidth, sqHeight); square.setFilled(true);
x_pos = c * SQUARE_SIZE : Moves the drawing pen to the right as the column index increases.
