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Leinier Dominguez Perez vs Bogdan Belyakov
Russian Team Championship (2015), Sochi RUS, rd 1, May-01
Old Indian Defense: Ukrainian Variation (A54)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
May-02-15  lakshashishu: 28...Qf6 has to be blunder of tournament.
May-02-15
Premium Chessgames Member
  thegoodanarchist: incredibly bad by Black. His 28th move looks just like something my buddy Ken Sauder would play, and his rating is ~1200
May-02-15  Eduardo Leon: <thegoodanarchist> Not that there is anything better at that point.
May-02-15  Eduardo Leon: If anything, the really questionable thing is how black arrived to a completely lost position in less than 20 moves. However, it isn't surprising if we analyze his prior play.

4...a5 already seems premature to me: Black effectively commits himself to never playing ...b5, which can be useful to open lines in the queenside if white castles there.

I have no idea what purpose 6...♘fd7 and 7...♗g5 could've possibly served. Of course white was not going to exchange bishops.

By move 12, we can already see some signs that something went wrong with black's opening play. White has more space in the center and kingside. Black's queenside expansion has been halted by a single pawn move. If I were black, I would try ...c6, ...♕c7 and ...♗d7, hoping to be able to play ...b5 at some point in time. Instead, black wastes even more tempi with his knights.

16.f4 is the most natural thing in the world. Because his king is already safe in the queenside, he can afford to sacrifice a few pawns to open the center and increase his space advantage.

I think 16...f6 would've been more stubborn than 16...exf4. At least, it doesn't allow white's e pawn to reach the fifth rank.

If 16...exf4 was bad, then 19...♕xg4 is outright suicidal. The only one who can benefit from an open g file is white. Though, at this point, black's position was very hard to defend already.

May-03-15
Premium Chessgames Member
  thegoodanarchist: <Eduardo Leon: <thegoodanarchist> Not that there is anything better at that point.>

Actually, 28... Qe7 is better but won't save Black. He could have just resigned instead.

May-03-15  Eduardo Leon: <thegoodanarchist> 28...♕e7 allows mate in two: 29.♕xh7+ ♔f8 30.♕h8#, so, technically speaking, it is even worse. At least if we go by the engine-like criterion that, when mate in unavoidable, optimal play is delaying it as much as possible.
May-03-15
Premium Chessgames Member
  thegoodanarchist: <Eduardo Leon: <thegoodanarchist> 28...♕e7 allows mate in two: 29.♕xh7+ ♔f8 30.♕h8#, so, technically speaking, it is even worse. At least if we go by the engine-like criterion that, when mate in unavoidable, optimal play is delaying it as much as possible.>

Well, when humans are playing without the help of engines, then "practical chances" take precedence over delaying mate.

For example, losing your queen for nothing offers zero practical chances, however every chess player has overlooked a mate in 2 at some point in their career.

Thus, Black should play 28...Qe7 and only resign if White captures the h-pawn on move 29

May-15-15  bcokugras: What about such a defense as 21... Kxc4, 22 Qxc4, Qxf6
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