916 Checkerboard V1 Codehs Fixed ((top)) Jun 2026
"Get the fixed code for the 916 Checkerboard V1 problem on CodeHS. Understand common issues and learn how to implement a working solution using a 2D array and nested loops."
function start() while(frontIsClear()) paintRow(); if(frontIsClear()) moveToNextRow();
The objective of Exercise 9.1.6 is to use nested loops to draw a standard checkerboard pattern on the screen. The program must alternate colors—typically red and black or black and white—across rows and columns using graphical square objects. Key Requirements
while row_count > 0: # Column Counter col_count = 8
: Karel never stops moving or gets stuck painting. 916 checkerboard v1 codehs fixed
def print_board(board): for row in board: print(" ".join([str(x) for x in row]))
: Always verify Karel can move before attempting:
This is the most common bug. If Row 1 ends with a ball, Row 2 must start without a ball. If Row 1 ends without a ball, Row 2 must start with a ball. If you use the exact same logic for every row without checking Karel's orientation or row number, your rows will mirror each other instead of alternating, creating stripes instead of a checkerboard. Structural Logic: How to Build the Algorithm
Using <= totalRows instead of < totalRows inside your loop conditions when your loops are zero-indexed. "Get the fixed code for the 916 Checkerboard
If the sum is an , leave it empty (or place an alternate color).
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?
Need help with another CodeHS exercise? Check out our guides for 9.1.7, 9.2.3, or 10.3.5 — all with verified fixes.
statements correctly skip the middle two rows, leaving them as zeros. Key Requirements while row_count > 0: # Column
To determine the color of any specific cell without tracking state variables across rows, you can use the
The 916 Checkerboard problem on CodeHS is a classic challenge that requires creating a checkerboard pattern using a loop. Here is a fixed and well-documented solution:
: