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Zorigt Bayaraa vs Marc Esserman
United States Chess League (2008), Internet Chess Club, rd 13, Dec-06
Sicilian Defense: Najdorf Variation (B95)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Dec-26-08  notyetagm: 24 ?


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Black has just played 23 ... b7-b5 to chase away the White a4-knight. White duly retreated the White a4-knight with 24 ♘a4-c3?!. Instead she could have won with the brilliant 24 ♘a4-b6!!.

(VAR) 24 ♘a4-b6!!


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http://main.uschess.org/content/vie...:

<The moment of truth, however, came on move 23, when both sides were beginning to get dangerously low on time. Black's 23...b5 led to a position in which White could have dealt Black a tactical blow:

24.Nb6!! Nxb6 25.Rd8 Kh7 26.Qxf7+ Qg7 27.Qxf3 would have left Black helpless.>

(VAR) 24 ♘a4-b6!! <pin: d8-square> ♘d7x♘b6 25 ♖d1-d8 <the point> ♔g7-h7 26 ♕e7xf7+ ♕e5-g7 27 ♕f7xf3


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So both sides missed the idea of 24 ♘a4-b6!!, exploiting a powerful <PIN AGAINST A SQUARE>, as the White d1-rook <PINS> the Black d7-knight against the d8-square.

24 ♘a4-b6!!: <PINS AGAINST SQUARES>: Black d7-knight is <PINNED> to the d8-square by the White d1-rook.

Dec-26-08  notyetagm: 18 ?


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Black has just played 17 ... h5xg4?!, opening the h-file and threatening the <UNDEFENDED> White h1-rook.

To meet this threat of ... ♖h8x♖h1, White played the automatic 18 ♖h1x♖h8?!. Instead White could have played the much stronger <ZWISCHENZUG> 18 f3-f4!, meeting the attack on the <UNDEFENDED> White h1-rook with an <EQUAL OR STRONGER THREAT (EST)> against the <EXPOSED> Black e5-queen.

(VAR)
18 f3-f4! <zwischenzug>


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http://main.uschess.org/content/vie...:

<Much to the excitement of those watching on the Internet Chess Club , Zorigt gained a sizable advantage in the opening. <<<As pointed out by the spectators the in-between move 18.f4! instead of 18.Rxh8+ would have secured White's positional dominance.>>>>

<FRITZ 11> evaluates the <ZWISCHENZUG> 18 f3-f4! at <+2.67 > whereas it evaluates the obvious capture 18 ♖h1x♖h8?! at <+1.16 >, a difference of over 1 1/2 pawns(!). So Fritz 11 says that White has a winning position after the <ZWISCHENZUG> 18 f3-f4! but White is only much better after 18 ♖h1x♖h8?! .

1: Zorigt Bayaraa - Marc Esserman, United States Chess League 2008


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Analysis by Fritz 11:

1. (2.67): 18.f3-f4 Qe5-g7 19.Rh1xh8+ Qg7xh8 20.Bf1-g2 Qh8-f8 21.e4-e5 d6-d5 22.Bg2xd5 Qf8-b4 23.Bd5-e4 Qb4-b6 24.Qd2-g2 Nd7-c5 25.Qg2-h2 Nc5-d7 26.Qh2-h4 Qb6-e3

2. (1.16): 18.Rh1xh8+ Qe5xh8 19.f3-f4 Qh8-f8 20.Bf1-e2 g4-g3 21.Qd2-e3 b7-b5 22.a2-a3 Bc8-b7 23.Qe3xg3 0-0-0 24.Qg3-e3 Nd7-c5 25.b2-b4 Nc5-d7 26.Kb1-b2

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Featured in the Following Game Collections[what is this?]
24 Na4-b6!! Black d7-knight can't defend b6, block d-file to d8
from OVERLOADED! by notyetagm
18 f3-f4! ignores attack on undef h1-rook, attacks e5-queen
from EST'S: EQUAL OR STRONGER THREATS by trh6upsz
18 f3-f4! ignores attack on undef h1-rook, attacks e5-queen
from EST'S: EQUAL OR STRONGER THREATS by notyetagm

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