Adding more material to his treasure chest will lose tempo when black gives check and continues to attack.

"But dk tempo changes every move because each player takes turns, how does he lose tempo?"

Players take turns but here black will give check which forces white's move, and then black goes again.

Essentially black will get to move a second piece before white gets to move another.

So tempo will turn into development for black. An extra guy will come out that should not have.

Okay at whites 11th, he has both material and tempo (it's his move right now) what does he need? POSITION.

In this case position means 00. Black will be unable to 00 or 000. That will be a permanent advantage for white if he can prevent 00.

You can call it position, you can call it development, call it king safety.

Whatever, it's something white will have that black does not.

Does it win the game? Yes. WHy? Because the game is already won! WHite has the move and he has material. Duh.

Black will try to regain material w/ fxe but that gains 2 and he is down 3.

Anyhow

11 00

<17. Bxe6! fxe6 18 Qxe6+ Be7

After the alternative defense 18...Qe7 White has a choice between 19.Qb3 Bg7 20.Rg1 (but not 20.Re1 Be5 21.Rxe5 Qxe5 22.Qxb7 O-O when the advantage passed back to black) 20...Rf8 21.Rg4, or the more convincing 19.Qf5! Bc8 20.Qf3! and Black still cannot castle, and 20...Ra7 is met by 21.Ne4, and after 20...Qc7 all the white forces unite with:

You can call it position, you can call it development, call it king safety.

Whatever, it's something white will have that black does not.

Does it win the game? Yes. WHy? Because the game is already won! WHite has the move and he has material. Duh."

Secondly, I think I read in another game some member (I believe it was DK) claim that when counting material, doubled pawns only count as 1 pawn. He even added the comment "it works every time."

Of course, though, this is ridiculous. When counting material, you count all your material. What you then have to do is consider the position itself. I don't know why you'd make a decision just based on material count anyway -- you'd be dumb not to consider what the material is doing and what its potential is. If someone has a bad bishop vs a good bishop, we don't discount either bishop in the material count. However, we give the good bishop an advantage because the position affords it this advantage.

For those who may be familiar, was this game part of a particular Master's Open?, --or to phrase it differently, what were the conditions of the tourney and what other players were there?

It is not difficult to see why he played these moves. He was well-acquainted with the potential effects of a White bishop posted on the a2-g8 diagonal, especially before the opposing king had castled, and it is easy to see that Black's queenside pawn structure is weakened after 8. Nxc6.

It is also easy to see that 9. e5 leads either to 9...dxe5 10. Qf3 Be7 11. Rd1 or O-O or to 9...Qa5 10. Bxf6 gxf6 where Black's kingside pawn structure is weakened.

He also was well-aquainted with the principle of opening up the center files while the opposing king is still in the center, and simultaneously keeping his own queen on the d1-h5 or h5-e8 diagonals, which explains moves 11-16. After Black then played 16. Bb7 it is certainly no surprise that Nezh replied with 17. Bxe6.

There are however, two other lines that Tal didn't expound upon that could cause White some serious difficulties: 18. Qxe6+ Qe7 19. Qb3 Bc8! and 18. Qxe6+ Qe7 19. Qf5 Bc8 20. Qf3 Qc5!