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Installing Daily Chess Puzzle Widget is very easy and does not require any template modification in most cases. The only requirement is that your template supports widgets. Just follow these steps:

1. Upload the folder 'daily-chess-puzzle-widget' to the '/wp-content/plugins/' directory.
2. Activate the plugin through the 'Plugins' menu in WordPress.
3. Under "appearance" on the "widgets" page you will see a "Daily Chess Puzzle Widget" that you can drag into your sidebar. Select the size of puzzle you want to display.