645 Checkerboard Karel Answer Verified Extra Quality Jun 2026

Ensure your turn conditions accurately align Karel to face the correct direction before the next fillRow() call.

Here is the verified Karel code for the 645 Checkerboard Karel challenge:

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If a row ends on a beeper, the next row must start with a blank space.

The classic implementation for this problem is in Java, using Stanford's karel.jar library. Here are two different, verified code examples. Ensure your turn conditions accurately align Karel to

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Karel checks the front again . If clear, it moves a second space and drops a beeper. If you share with third parties, their policies apply

The most reliable way to solve this is to think about each row individually while keeping track of whether the next row should start with a beeper or a blank space.

if (rightIsClear()) turnRight(); move(); turnRight(); else if (leftIsClear()) turnLeft(); move(); turnLeft(); else break;

Below is the answer for the 645 Checkerboard problem. This code has been tested on world sizes from 1x1 to 20x20.