|Sergash: After his 19th move, Carlsen had achieved complete equality. <19.Nxf5!? Nc5! = 20.Ng3 Rae7! 21.Nd5> Suddenly the computer prefers Black (not by much though!). |
Better was 20.Nd5 Ncxe4! 21.Bh4 = Stockfish 7 - 64 bits POPCNT.
Also : 21.Bxc5! bxc5 22.g5 Nd7 23.Qd2 = / Stockfish 7 - 64 bits POPCNT
Then Carlsen calculated a long series of exchanges that brought him a small advantage :
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<21...Bxd5! 22.exd5 (the recapture with the 'c' pawn was as good) Rxe1+! 23.Bxe1 Rxe1+! 24.Qxe1 Nd3 25.Qd1 Nxc1 26.g5!>
25.g5 is a necessary intermediate move. I guess grandmaster Badea was now realizing the 10 year old untitled kid in front of him had got the better position now?
Then <26...Nxa2?!> losing the newly built advantage...
Carlsen had to play 26...Ng4! 27.Qxc1 (or 27.Qxg4 Nxa2 Stockfish 7 - 64 bits POPCNT) b5 28.h3! Qa7+! 29.Kh1 Nf2+ 30.Kh2 g6 Stockfish 7 - 64 bits POPCNT.
Then I think Carlsen was in zeitnot (time pressure) between the 30th and the 40th nove.
First mistake: <30...Kh8?>
The kid had to play 30...Qe5! 31.Qc8+ Bf8 32.Bxh7+ Kxh7 33.Qxf8 Qf6! = Stockfish 7 - 64 bits POPCNT.
But Badea went for <31.Kf1? Qd8! => maybe to restart the boy's clock quickly?
Or maybe he was afraid of all those checks that could follow? So he missed 31.Qh4! (threat: Qxh7#) h6 32.Nf5! Kg8 33.Nxd6 Qe5 34.Nf5 Qa1+! 35.Kg2 Qb2+ 36.Qf2! Qxf2+ 37.Kxf2 Stockfish 7 - 64 bits POPCNT
Then <33.Qf5 (again threatening Qxh7#) Qg8??>
This was the fatal mistake. Carlsen would have survived with 33...Kg8! 34.Qxh7+ Kf8 = Stockfish 7 - 64 bits POPCNT.
After <34.Nf6+! Bxf6 35.Qxf6+ Qg7 36.Qd8+ Qg8 37.Qxd6 a5 38.Qxb6> there was no hope left...