First, I’ve some very important information to announce today. A few months ago, we switched to our new site. As you might have noticed, now we’ve also improved our support system and switched to a new one. 
The most important thing you should be aware of is that our support e-mail address has changed to support@chess-teacher.com. Additionally, you can contact us through the Support Form here: LINK
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TIP: it would be convenient if you bookmark any (or even all) of those pages. We’re always here to help you! 
Second, I’d like to remind you of the upcoming webinar “Chess calculation training” (LINK), which will be conducted by IM Attila Turzo on Sunday 5 July at 10 a.m. New York time (check timings here: LINK). You can find more details about the webinar and sign up here: LINK
Additionally, I thought that I could help you ‘get ready’ for Sunday’s webinar by discussing “calculation” today.
So, without further ado, let’s get started!
Example
Avetisyan – Anton Guijarro
Black to move
It’s Black’s turn now in the above position. Please spend some time thinking about the game situation and come up with how the Black player should have continued.
Yes, Black has got an amazing move – 28…Bxh3! Of course, this is a very obvious move.
But were you careful to look at White’s counterattacking move? Speaking about calculations, you MUST think of the consequences of your moves – you need to calculate the most important variations.
Yes, White has a counter-blow 29.f4!? Did you calculate this move, honestly? If yes, then accept my congratulations! Now moving the knight is bad, as gxh3 will lose a piece.
Now moving the knight is bad, as gxh3 will lose a piece.
[29.gxh3?? Nf3+–+ should of course be avoided!; 29.Rdc1 Bd7 Black has simply won a pawn.]
So Black plays 29…Bg4! [29...Ng6 30.gxh3 Nxf4 31.Qe3± gives White a good position.] 30.fxe5 [30.Rdc1 Ng6µ] 30…Bxd1 [30...dxe5 is also a good move.] 31.Qxd1
Black to move
[31.exd6 does not work because of 31…Qc3 32.Qb6 (32.Qxc3 Rxc3–+) 32…Rd7 33.Rxd1 Qxb3–+]
31…dxe5µ Black has two pawns and a rook for two minor pieces, but the most important thing is that the White king is weak and Black has a very active rook on c2. Black has a clear advantage and went on to win.
32.Nd2 f5 33.Bd3 Rc3 34.Nf3 Qc5+ 35.Kh1 Qe3 36.Nxe5 fxe4 37.Bf1
Black to move
37…Qg5 38.Qd4 Rc1 39.Rxc1 Qxc1 40.d6 Qxf1+ 41.Kh2 Qf5 42.Qd5+ Kh7 43.g4
Black to move
Qf4+ 44.Kh3 Qe3+ 45.Kh2 Rf8 46.Ng6 Rf4 0–1
Well, that was lengthy bit of calculation indeed. But remember, there is no limit to YOUR huge mind! Now, I’m going to give you some practical exercises which you can try to solve yourself.
Now, I’m going to give you some practical exercises which you can try to solve yourself.
Maybe to motivate yourself, you can set a target and calculate. For instance, for a puzzle, you can set a target of 10 moves. So you will calculate 10 moves (this is just an example) from the given position, and finally you may check your results by seeing the whole game.
Exercise-1
Yilmaz – Hudyakov
White to move
Exercise-2
Grischuk – Aronian
White to move
Exercise-3
Eduardo – Alexander
White to move
Exercise-4
Topalov – Grischuk
Black to move
After calculating all possible variations, you can check each and every game here: LINK
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The Grandmaster's Secret
The Grandmaster's Openings Laboratory
How to Beat Titled Players
Your Winning Plan
An Endgame Expert
Self-taught Grandmaster
The Grandmaster's Positional Understanding
Calculate Till Mate
