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Darwin Yang vs Eugene Perelshteyn
"Yin and Yang" (game of the day Feb-21-2021)
36th World Open (2008), Philadelphia, PA USA, rd 4, Jul-04
King's Indian Defense: Orthodox Variation. Glek Defense (E94)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Feb-21-21
Premium Chessgames Member
  al wazir: Why did white resign?
Feb-21-21
Premium Chessgames Member
  beatgiant: <al wazir>
Maybe because there's no way to stop Black from playing ...Nh3 followed by ...Nxf2 with threats up the yin yang?
Feb-21-21
Premium Chessgames Member
  al wazir: <beatgiant: Maybe because there's no way to stop Black from playing ...Nh3 followed by ...Nxf2 with threats up the yin yang?>

I'll buy that. Thanks.

Feb-21-21
Premium Chessgames Member
  HeMateMe: where's the 'Yin'?
Feb-21-21  RandomVisitor: 25.Qd3 was necessary. After that, it was survival of the fittest...


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Stockfish_21022022_x64_modern:

<40/69 04:02 +2.13 25.Qd3 Rb8 26.b3 Bh3+ 27.Ke2> Bg2 28.Nd6 Rbd8 29.Nxf7 Kxf7 30.Qc4+ Kg6 31.Rg1 Kh7 32.Qe6 Rf6 33.Qe7 Rdf8 34.Bh4 Qxh4 35.Rxg2 R8f7

Feb-21-21  newzild: <al wazir>

I'll buy that too.

I thought the idea of Bf6 was to allow Kg7 followed by Bxc4 and Nxf3, but couldn't figure out why Black didn't just move his king off the a2-g8 diagonal immediately.

Feb-21-21  Brenin: Daniel Yang was 11 years old at the time of this game. At least the resignation was a mature judgment: as <beatgiant> has pointed out, White has no reasonable defence against Nh3, Nxf2 and Bh4.
Feb-21-21  goodevans: <HeMateMe: where's the 'Yin'?>

I believe he was in the audience that day: https://en.wikipedia.org/wiki/Billy...

Feb-21-21  goodevans: <RandomVisitor: 25.Qd3 was necessary...>

The point being that the K will be much better off on e2 than on e1. With the K on e2 white's forces coordinate much better (e.g. his Rs can access the K-side).

White needs to consider whether f3 will become a target as becomes evident if the Q goes instead to d2: <25.Qd2 Qh5 26.Ke2 Ng5 27.Qd3 Nxf3 28.Qxf3? Bg4>.

After 25.Qd3 the same plan for black isn't quite quick enough: <25.Qd3 Qh5 26.Ke2 Ng5 27.Rh1> so f3 is safe.

Feb-21-21  RandomVisitor: <goodevans>Yes, white is able to fend off any black attack, and in turn take advantage of the exposed black king. The white queen is able to survive on the open d-file due to the Nd6-f7 trick. A longer run confirms the white advantage:


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Stockfish_21022022_x64_modern:

<61/96 6:06:15 +2.37 25.Qd3 Rb8 26.b3 Bh3+ 27.Ke2> Rbd8 28.Nd6 Bg2 29.Nxf7 Kxf7 30.Qc4+ Kf6 31.Rd3 Qh5 32.Rg1 Qh3 33.Qxa6 Rxd3 34.Qxd3 Kg6 35.Nb1 Bf6

Feb-21-21  RandomVisitor: At move 18, Stockfish has trouble deciding between 18.Qa4 and 18.exf5:


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Stockfish_21022022_x64_modern:

<54/74 2:22:56 +0.94 18.Qa4> f4 19.Bf2 Bd7 20.Nc4 g5 21.Nd6 Nxd6 22.cxd6 Qxd6 23.Rfd1 Qe6 24.Rd3 Rf7 25.Qc2 h5 26.Na4 Qg6 27.Nc5 Be6 28.Rd6 Re8

53/82 1:51:57 +1.20 18.exf5 gxf5 19.Qa4 Rb8 20.Qxc6 Rxb2 21.Nc4 Bd7 22.Qc7 Rc2 23.Rac1 Rxc1 24.Rxc1 Qe6 25.Na5 Kh8 26.Rd1 Bc8 27.Qc6 e4 28.Nd5 exf3

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