Question involving theory on the najdorf.

In the game Shirov vs Van Wely 2007 (http://www.chessgames.com/perl/chessgame?gid=1444696), on move 13 black plays the knight to e8 (13...Ne8). Why is this? Why not play the knight to h5?

Thanks

here i will attempt to answer this:

He played Ne8 Instead of Nh5 if he plays Nh5. Where is the Knight  Going? that knight has no future and is hardly doing anything. if he plays it to E8 he can play and improve the position of that knight by Going Nc7 and Maybe Jump to b5.

That is why he played Ne8.

Nh5 is Also Playable but its bad for black. here black s' plan is to play Nf4 to give a good square for that knight but after Bxf4 exf4 Qxf4 white has an advantage.

Thanks. I thought that maybe Nh5 is okay because it could stop whites kingside pawn storm but active play with the knight going on to c7 and b5 is better.

Again thanks a lot

Nh5 is a bad move if white can attack it.

And indeed, on 13...Nh5 14.Ng3! makes the job!

Now if black takes on g3, white will have h file openned, Qh2 will follow...

So Black has to play Nf4, where the knight seems nice but not stable. White should protect g pawn with h4, and have this nice idea : Nd4!

U don't have this with Ne8, seems passive but u dont have any problem with your knight.