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John Daniel Bryant vs Parker Bi Guang Zhao
USA Junior Championship (2010), St Louis USA, rd 9, Jul-19
Sicilian Defense: Alapin Variation. General (B22)  ·  1/2-1/2


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Kibitzer's Corner
Jul-20-10  pastpawn: An interesting endgame: 72 ♘f2+! was a nice idea, since capturing leads to a drawn ♔♗ + wrong color ♖♙ vs ♔ position . Looking at a tablebase, 71 ... e2 would have won Black the game and the tournament, although the position after exchanging rooks on move 67 is drawn. 68 ♘e4 is a losing move, instead of the only way to hold the draw, 68 ♔e2. A line I liked is 68 ♔e2 ♗d4 69 ♘e6 ♗b6 70 ♔f3 ♔h4 71 ♘f4 h5 72 ♘d5 ♗a7 73 ♘xe3 ♗xe3 74 ♔g2!= (not 74 ♔xe3?? ♔g3 ).

It's interesting how hard it is for humans to play (correctly) simple-looking endgames under tournament conditions (i.e. after several hours of play, and on increments).

Jul-20-10  wanabe2000: <pastpawn>

I was listening to Nakamura's comments on the ending of this game. He gave 73...e2 as winning. The Shredder table base confirms this as correct.

You are right about 68.Ne4? The Shredder table base gives that move drawing, all other moves lose. As you stated, it is difficult to find the winning maneuvers under pressure.

However, when move 73...e2 wins quickest, 73...Bg3 and 73...Bd4 would also win with correct play. Black lost his final winning chances with 75...Bd6? when the clever 75.Nf2+! draws. Even at the incorrect 75th move Black could still have won with 75...e2, 75...Bg3, or 75...Bb6.

Tough game for the young Parker Bi Guang Zhao.

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