Interesting puzzles - 5

Here's one I heard from a junior:

You have a chessboard of side length 2^n. An arbitrary unit square is removed from this board. Is it possible to tile the remaining chessboard with L shaped tiles having 3 unit squares each (as shown in the figure below).

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Back ...

So I am back to blogging after a great break to Tiruppur and some busy work with some internal deadlines.

On a work related note, I will be moving to the RFID group here.

If you like python and puzzles you must have a look at python challenge. Naturally they are python centric (python module names in hints and the like..). Download the python imaging library before you start :). I am at level 16 now and can give additional hints if necessary ;)