U¿ytkownik "Gregory" napisa³ w wiadomo¶ci
...
My nephew here in the UK is a very enthusiastic chess player, and I
want
to give him a chess-related present for his 12th birthday. He already
has chess sets, chess books,

I'd say the easy answer is: more books. There exist many excellent
biographies of great chess masters, that everyone "should" have.
Or you could ask him what books are on his wish list.

This reminds me of the following little joke:
- I'll buy you a book for your birthday.
- No thanks, I already have a book!

chess computers, chess programs, a
subscription to a chess magazine, and he's even got the new DVD "Game
Over" about Kasparov vs. the computer. I'd really like to give him
something special, or at least usual, up to about £50 in value, maybe
Kasparov-related.

Kasparov, The Test of Time, is a must have for an advanced player.
Also, Kasparov, My great predecessors, vol.1, 2 etc., are great gifts.

isi