There were many fighting and exciting games is the Round 3 of the World Cup. Sergey Shipov annotates the most interesting fragments.
The main sensation occurred at the first table. Despite all the achievements of Judit Polgar, people still tend to underestimate her. Which, of course, benefits her at the board...
J. Polgar — S. Karjakin
If the Black’s bishop arrives to b7, White’s hopes are gone, so she needs to hurry.
20.e6! Bxe6 21.Bxc7
The White’s bishop breaks to the queenside pawns. In order to defend Black need to solve a tricky study. Sergey did not succeed.
Insufficient is 21...Bd7 22.Bb8 Bc6 23.Nc3 (23.Re1 Kd8 24.Bxa7 Kc7) 23...Bxf3 24.gxf3 a6 25.Nd5 Bd8 26.Bc7!
The only solution is to bring the h8-rook to the 6th rank: 21...Rh6! 22.Bb8 a6 23.Ba7 Bd8 24.Nc3 Bd7 25.Nd5 Re6 with equality.
22.Bb8 a6 23.Ba7
I did not understand why the opponents ignored the following simple line: 23.Bc7!? b5 24.Nxc5! with the idea 24…Bxc5? 25.Rd8+, and Black loses an exchange.
Here Karjakin began to think again, but it was already too late.
Black probably miscalculated the following line: 24...Ne7 25.Na4 Nc8, missing an unexpected blow 26.Bxb6! Nxb6 27.Nxb6 Bxb6 28.Rd6 with a healthy extra pawn for White.
25.Na4 b5 26.Nxc5 Bc8
The magic of the bishop pair could create an impression that Black survives even without a pawn, but Polgar can cast the anti-spell.
27.cxb5 axb5 28.a4!
Simple and strong.
28...bxa4 29.bxa4 Re8 30.Rb1 g5?!
The last inaccuracy. More stubborn is 30...Re2!, and White cannot win by straightforward means: 31.Rb8 Nd6 32.Bb6 (32.Nxh4?! Re1+ 33.Kh2 Bc7!) 32...Bxb6 33.Rxb6 Ne4 34.Nxe4 Rxe4 35.a5 Ra4 — the a5-pawn is stopped.
31.Bb6! Be7 32.a5 Bxc5 33.Bxc5
The opposite-colored bishops don’t affect the evaluation here because of the passed pawn.
33...Re6 34.Rb6 Ng7
Or 34...Rxb6 35.Bxb6 Ke6 36.Bd8!
35.Be3 Nf5 36.Rb8 Re8
Here is a nice line: 36...Nxe3 37.Rxc8 Nd5 38.Rc5 Nf4 39.Rxg5! fxg5 40.Nxg5+ Ke7 41.Nxe6 Nxe6 42.a6 Nc7 43.a7 Kd7 44.g4, and White wins.
Black probably loses after 37...Bd7 38.Rxe8 (38.Ra7!?) 38...Kxe8 39.a6 Nxe3 40.fxe3 as well.
38.Ra7 Re7 39.Bc5 Rd7 40.a6 Bc6 41.Rxd7+ Bxd7
Black easily survives, if we remove the knights from the board, but it is not going to happen.
42.Nd2! Ke6 43.Nc4 Bc6 44.Nb6 Nd6 45.Bxd6 Kxd6 46.a7 Kc7 47.a8Q Bxa8 48.Nxa8+ Kb7 49.f4!
And the king collects Black’s pawns. Black resigns.
More analysis here.