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Peter Svidler vs Nico Georgiadis
Biel (2018), Biel SUI, rd 2, Jul-23
Sicilian Defense: Canal Attack (B51)  ·  1-0



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Kibitzer's Corner
Premium Chessgames Member
  An Englishman: Good Morning: 39.White to Play--if sound, a future puzzle.
Jul-23-18  Marmot PFL: Why didn't black play 44...Rxh3+, or did he miss 45 Ne3?
Jul-23-18  pawnpro: nico almost had him but not strong enoght in the end very powerful opening by both players
Premium Chessgames Member
  PawnSac: < 13.Bd2 >
A new move/novelty? The CG database shows only 13.h3 (2 games), a typical idea to develop Bf4. If black plays ..e5 then Bh2. This clears the back rank for the rooks, and d2/e3 to facilitate a knight transfer toward the K-side, the path of which depends on the pattern black choses.

Bd2 may look a little odd, but saves a tempo and anticipates Nxc3 Bxc3 which suggests...

< 17. Qe4!? > is part of Peter's prepared analysis.

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There are several candidate moves here:
Nxc3; Nf4; and N7f6. The most ambitious is ..N7f6 as it continues knight development, blockades f7 from a possible Qf5, supports the knight on d5 (which still has the option of f4), and offers the Qxe5 Bd6 gambit. Nxc3 is based on the idea of refuting a gambit by accepting it (i.e., ok, prove it!). I therefore loaded the position in stockfish to see what the prog thinks..

25/45 02:38 95,171k 599k -0.13 17. ... Nxc3 18.Bxf7+ Kxf7 19.Qf5+ Kg8 20.Bxc3 Qc6 21.Nc4 Bf6 22.Qh3 Rcd8 23.Qg3 Re7 24.Ne3 Qe6 25.Ng4 Bxf3 26.Qxf3 Bg5 27.Ra1 Rf8 28.Qh3 h6 29.Bxe5 Nxe5 30.Rxe5 Qf7 31.Ree1 Qg6 32.Rxe7

32/54 20:06 728,969k 604k -0.10 17. ... N7f6 18.Qh4 Bd6 19.Nc4 Nf4 20.Nxd6 Qxd6 21.Nxe5 Nxg2 22.Nxf7 Qxd3 23.Rxe8+ Rxe8 24.Qc4 Qxc4 25.Bxc4 b5 26.axb5 axb5 27.Nd6+ bxc4 28.Nxb7 Nh4 29.Be3 Nf5 30.Bxc5 Re2 31.Na5 Ne4 32.Bb6 Nfd6 33.Bc7 Nb5 34.Bg3 Rxb2 35.Nxc4 Nbxc3 36.Ra1 Rb4 37.Nd6 Nxd6 38.Bxd6 Rg4+ 39.Kf1 Rg6

36/54 1:49:22 3,281,402k 500k -0.08 17. ... Nf4 18.Qf5 Bf6 19.Bxf4 Bxf3 20.Bg3 Bb7 21.Rc2 Qc6 22.f3 b5 23.Rce2 Re7 24.Qh3 g6 25.axb5 axb5 26.d4 c4 27.Bc2 Rce8 28.Be4 Qb6 29.Bxb7 Qxb7 30.Bh4 Bxh4 31.Qxh4 Re6 32.Nc2 Qb6 33.Qf2 Kg7 34.Ra1 exd4 35.Rxe6 Rxe6 36.Qxd4+ Qxd4+ 37.Nxd4 Rb6 38.Ra7 Nc5 39.Ra5 Kf6 40.Rxb5 Rxb5 41.Nxb5 Nd3

hmmm. They all seem to fair about equal, so i suppose it's a matter of taste. I leaned toward ..N7f6 (since i tend to chose the more ambitious and often risky lines). But in the practical, black is for choice.

Premium Chessgames Member
  HeMateMe: why doesn't black play 39...PxN?
Premium Chessgames Member
  Count Wedgemore: <HeMateMe: why doesn't black play 39...PxN?>

Because after 40.Qg6+ Kf8 41.Qxh6+ Kg8 42.Re6 (threatening Rg6+ and mate in 3), Black will get mated. The only thing Black can do is delay the mate by giving some checks, that's it.

Premium Chessgames Member
  ChessHigherCat: Another brilliant tactical performance by Svidler. The fact that he's not the star of the tournament shows what a strong field it is.
Jul-25-18  cormier:

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Analysis by Houdini 4:

d 25 dpa 1. = (0.11): 21...Qc6 22.Qh3 Qd5 23.Ne3 Qe6 24.Ng4 Rcd8 25.a5 Bxf3 26.Qxf3 b5 27.Nxf6+ Qxf6 28.Qe4 Qf4 29.Red1 Qf7 30.f3 Qe6 31.Be1 Nf6 32.Qe2 Rd5 33.Bf2 Qd6 34.Re1 Rd8 35.Rc3 Qc7

d 24 dpa 2. = (0.21): 21...g6 22.Qg4 b5 23.Ncd2 Bg7 24.Ne4 Nf6 25.Nxf6+ Bxf6 26.Re3 Re7 27.Rce1 Rce8 28.Qg3 Bxf3 29.Rxf3 Bg7 30.Qh4 Rf7 31.Rxf7 Qxf7 32.axb5 axb5 33.Qe4 b4 34.Bd2 Rd8 35.Be3 Qd5 36.Qc4 Qxc4 37.dxc4 Bf8 38.Bg5 Rd4

Premium Chessgames Member
  patzer2: <An Englishman: Good Morning: 39.White to Play--if sound, a future puzzle> No doubt 39. Nxh6! ± (+1.24 @ 34 ply, Stockfish 8) is sound.

I think it would make for a good Thursday or Friday puzzle discussion, especially since the second best alternative 39. axb5 ± (+0.96 @ 34 ply, Stockfish 8) is almost as good.

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98_B30/31+B51/52_<3 Bb5>-Sicilian (Rossolimo, Ca
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