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Ding Liren vs Zhou Jianchao
Chinese League (2012), Beijing CHN, rd 6, Jun-28
King's Indian Defense: Saemisch. Bobotsov-Korchnoi-Petrosian Variation (E81)  ·  1-0



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Kibitzer's Corner
Jun-29-12  DanielBryant: What was the positional justification for White's exchange sacrifice on move 20?
Jun-29-12  King Death: The problem is that White's pieces are a little tangled up and he can't play into 20.Rd1 because 20...Ra2 21.Be5 Re5 22.Nc6 bc 23.Rd8+ and Rc8 because 24...Rea5 is good for Black who threatens 25...Ra1+ winning. The way Ding played might be OK for him with a pawn for the exchange and some play.
Jun-29-12  luzhin: The other problem is that if 20.Rc2 Be3! or if 20.Rb2 Bc1 21.Rb1 Bf4! 22.a4 Nxf3+ 23.gxf3 Bxd6 and Black is much better. So the exchange sac with 20.a4 is actually forced.
Jun-30-12  hellopolgar: when you play against someone who is weaker, a bishop-rook exchange sacrifice when you are up a pawn is sometimes a good idea, especially if the opponent is in time trouble. being an exchange up (and possibly low on time), your opponent will play passively, allowing you to actually turn a dead even game into a victory.
Jun-30-12  rilkefan: At black's 17th, where stockfish thinks the position is equal, I wanted to play ...Ra3 instead of ...Bc8. This also evaluates as equal (at a depth of 24): 18.Be7 Rfa8 19.f4 Nd7 20.f5 Bxc4 21.bxc4 Re3.

Stockfish suggests 20...f5 as equal; it sees white wasting a tempo with 21.Bc7 compared to lines with an immediate ...Bxd2, as on 21.fxe5 c5 gives black an advantage (-0.4).

Aug-27-17  tigreton: An instructive rook endgame. 50. Re5! cuts off the black king on the 3rd rank, so he is not able to help the h-pawn, and at the same time prepares a bridge on the 5th rank should the black rook decide to attack from behind.

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