More about Pebbling a Chessboard
You really need to have seen the main video for this to make sense!
MAIN VIDEO: http://youtu.be/lFQGSGsXbXE
CONTINUATION: http://youtu.be/qbkH_0TNdk0
AND EVEN MORE: http://youtu.be/uENSO785aEI
PLUS CUT FROM PART ONE: http://youtu.be/hggcjvdCihc
Featuring Zvezdelina Stankova - Professor of Mathematics at Mills College, Director of Berkeley Math Circle, UC Berkeley
Spreading clones across a chessboard and escaping "prison" - commonly known as pebbling a chessboard.
Check these papers:
http://bit.ly/pebblechess1
http://bit.ly/pebblechess2