Thursday, July 10, 2014

Sacramento Chess Champoinship 2014

The night before the tournament begin, Bryon and I decided to play in the Sacramento /state capital/ Chess Championship. The July 4th fireworks didn't end until we both scored 5/6 to tying for first in the top section. In the 6 games I played over the July 4th weekend, there were lots of sparkles, explosions and exciting results like fireworks.

Tied for first at the Sacramento chess championship and
finally, made a master rating of 2206!
In my first round, I played the Austrian attack against the Pirc defense. Without too much difficulty, I reached a dominating position, where it guaranteed me a full point.
Position after 25.Bxf5
Uyanga Byambaa (2171) vs Ziad A. Beroudi (1914)
game continues 25...Qb5 26. Nc7 Qa5 27. Be6+ Kg7 28. Nxa5 1-0. Here, he lost on time as well as on the board. Interestingly, my opponent withdrew from the open section after round 2 and reentered in the Reserve section, where he finished tied for first.

Round 2 was one of my critical wins in the tournament. In the opening, somehow I misplayed my Kings Indian defense (KID), but he made a couple of inaccuracies, which allowed me to equalize. After finding some defensive moves, we reached this position.
Position after 24. c5
James Macfarland (2200) vs Uyanga Byambaa (2171)

24.c5 dxc5 25.Qc4+ Rf7 26.Qxc5 Bf8 27.Qb5 gxf3 28.Bxf3 Bd6 ugly, but important to defend the e5 and c7 pawns. "A bad bishop defends a good pawn." 29.Bxf6 Rxf6 30.Nd5 Rf8 31.Rc1 Qg6 32.Qe2 h4 33.Kh1 Kh7 34.Qf2 Qg5 35.h3 Rg8 36.Rc3 Qh6 Idea is to bring the rook to g3. 37.Qa7 Rg3 38.Kh2 [38.Nxc7? Rg7-+] 38...Rg7 38....Qg7 is better. 39.Qf2 Qg5 40.Be2 Be6 41.Bf3 Kh6 42.Kh1 Rg8 43.Kh2? Bxd5 44.exd5 e4 white resigned. 0-1

In round 3, I lost a difficult game against NM Robert Hatarik, who was leading the tournament with 3.5 after 4 rounds. I didn't feel too bad losing to him this time because the first time we played at the US amateur team west 2014, I defeated him in 17 moves with a fried liver attack.

Then I bounced back from my loss in round 3 by scoring an exciting victory with another KID.  

Graham Grindland (2030) - Uyanga Byambaa (2171) [E99]
Sacramento Chess Championship (4), 05.07.2014

 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 6.Nf3 e5 7.0-0 Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Nd3 f5 11.Bd2 Nf6 12.f3 f4 13.Rc1 g5 [13...c5 14.dxc6 Nxc6] 14.c5 Ng6 15.cxd6 cxd6 16.Nf2 h5 17.h3 Rf7 18.Nb5 a6 waste of time! helping the knight where it wants to go. it also weakens the queenside. [18...Bf8 is more accurate 19.Qc2 Bd7 20.Qc7 Bxb5 21.Qxd8 Rxd8 22.Bxb5 a6=] 19.Na3 Bf8 20.Nc4 b6 forced. Black shouldn't allow 21. Ba5 followed by Nb6 where it forks the rook and bishop. Black's light-square bishop is the key piece in KID, which later helps on the kingside attack. 21.a4 trying to challange the b6 square by playing a5. Again, black should not allow white to play a5. 21...a5 [21...Rb8 is playable. 22.Qb3 Bd7+/=] 22.Qb3 Rb7 [22...Rb8? 23.Nxa5+-] 23.Na3 Nh4?! Very aggresive move. I still refuse to give up on my kingside attack. 24.Rc6 g4?! unclear pawn sacrifice! [24...Bd7 is pointless since the rook doesn't have to move. 25.Nc4 Bxc6?? 26.dxc6 Rf7 27.Nxb6+-]
Position after 24.Rc6

25.hxg4 [25.fxg4 hxg4] 25...hxg4 [25...Rg7!] 26.fxg4 Rg7 27.Qxb6? [27.Qd1 keeps the advantage for white.] 27...Qxb6 28.Rxb6 Nxg4 29.Nc4? Diagram
Position after 29.Nc4
Black to play and win
[29.Nxg4 Bxg4 30.Kf2 Bxe2 31.Kxe2 Rxg2+ 32.Kd1=] 29...f3!! only move to win! 30.gxf3 [30.Nxg4 Bxg4 31.Bd3 fxg2-+; 30.Bxf3 Nxf3+ 31.gxf3 Ne3+ 32.Kh1 Nxc4-+; 30.Bd1 fxg2 31.Re1 Nxf2 32.Kxf2 Rf7+ 33.Kg1 Bh3-+] 30...Nxf3+ 31.Bxf3 [31.Kh1?? Nxf2+ 32.Rxf2 Rg1#; 31.Kg2 Ngh2+ 32.Kh1 Nxf1 33.Bxf3 Ba6-+] 31...Ne3+ 32.Ng4 Nxc4 white resigned since there are three pieces hanging at the same time and position is very difficult to save. 0-1

In the last day of the tournament, I was lucky to win both of my games. In round 5, I faced off against a strong expert Philip Stienez (2174) with black. Earlier in the game, I missed a good winning chance. Shortly after, I grabbed a pawn in a risky position where I found myself in trouble. Unfortunately, my opponent blundered in the time pressure on move 30, as a result; I was able to win the game.

In the last round, due to my opponent's choice of a dubious opening line, I obtained a big advantage and I was able to convert to a win.

Uyanga Byambaa (2171) - Kenan Zildzic (2230) [C57]
Sacramento chess championship (6), 06.07.2014
Position after 11...e4
White to play and win

12.Qxf7!+ Be7 13.h4 Qxg2 14.Qxd5+ Bd6 15.Rf1 Rhf8 16.Nc3 Rae8 17.Nb5 Rf6 18.Nxd6 cxd6 19.Qg5 Qf3 20.b3 Rf5 21.Qg3 Qh5 22.Ba3 Re6 23.Qxg7+ Rf7 24.Qg5 Qf3 25.Rc1 Rf5 26.Qg7+ Rf7 27.Qg3 Qh5 28.Qc3
black resigned. 0-1

Big Congratulations to expert Bryon Doyle who won the tiebreak! He had a truly amazing tournament with a performance rating of 2500 and he gained 80 points to make his rating 2164!
The winner of the Sacramento Chess Championship 2014
For me, this tournament is definitely one of the most memorable because I broke 2200 for the first time.

More info about the result visit:

fpawn chess blog:

Dana's blog :

Monday, November 25, 2013

Reno-Western states open 2013

Reno tournament, both the Larry Evans memorial and Western State open, are my favorite tournaments of the year. It is an excellent tournament, plus, less expensive, and not far from the bay area. Last October I went to the Western State open where I had a very disappointing performance; however, it was definetely the most memorable.  
A view from the hotel room on 15th floor of Sands regency
Another thing I like about the tournament is its side events, free lectures and game analysis by IM John Donaldson and sometimes GM Walter Browne.  One of the side events, GM Jesse Kraai's book reading attracted my interest. Check out the new chess novel, Lisa by Jesse Kraai! For more info visit:
I'd highly recomment everyone to read Lisa, a chess novel. It's a great book. I really loved it.
Lisa, a chess novel on my lap :)

To Uyanga 

who inspired me with a chessboard 
in the basement of Berkeley Public library!
                                        Jesse Kraai

 When Lisa studied with Igor secretly using the money she won from the tournament, it reminded me that I used to go to chess club secretly in Mongolia when I was in middle school because my parents wouldn’t let me pursue chess. I'd pay my teacher using the lunch money I saved everyday instead of eating lunch at the school.

I finished the tournament very poorly, scored 3 out of 6 in the expert section. Here is some of my games of the tournament.

Round 1:                    SAMIR ALAZAWI (2003) - UYANGA BYAMBAA (2075)                10/18/13

Position after 26. Bd3 /Find the best shot for black/

1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 0-0 6.Be2 e5 Kings Indian main line, classical variatian 7.0-0 [7.dxe5 dxe5 8.Qxd8 Rxd8 9.Nxe5 Nxe4 Note that 10.Nxf7 impossible because of 10...Bxc3+] 7...Nc6 8.d5 Ne7 9.Ne1 There are many possible moves here for white. The most common are b4 or Nd2 9...Nd7 10.Be3 f5 11.f3 f4 12.Bf2 Nf6? I already made a serious mistake giving up the c5 square too early. 13. g5 supposed to be played. 13.c5 g5 14.Rc1 Ng6 15.cxd6 cxd6 Houdini proves that white already have decisive advantage (+-1.45) 16.Nb5 Rf7 17.Qc2 Ne8 Not the best defense. 17...b6 is neccessary stopping Nxa7. I didn't think losing a7 pawn was a big deal. Certainly, this wasn't the case in which typical KID black launches kingside attack whitout caring the a7 pawn. Unfortunaly, my queenside fell apart too fast even before my kingside attack starts. 18.Nxa7 Bd7 19.Qb3 g4 A little hope! Seeking for some kind of counterplay. 20.fxg4 Nf6 21.Bb6 Qb8 22.Nb5 Nxe4 Still white has +-(2.00) advantage according to Houdini. 23.Bc7? almost any move is good, but this wasn't accurate. 23...Qc8 24.Qc2 Bxb5 25.Bxb5 Rxa2 Make sense to gain my pawn back and get rid of his passed pawn. However I completely missed 25..f3! idea [25...f3 26.Qxe4 (26.Nxf3 Qxg4 27.Nd2 Nxd2 28.Qxd2 Nf4+/=) 26...Rxc7] 26.Bd3? Gives me chance to equalize! 26...Nf6?? I was thinking about 26..Nd2! a long time. For some reason I rejected it and played this horrible move instead :( [26...Nd2! 27.Bf5 (27.Qxd2 Rxc7; 27.Rf2 e4 28.Rxd2 Rxb2 29.Bxe4 Rxc2 30.Rdxc2 Qxg4=/+) 27...Rxc7 28.Bxc8 Rxc2 29.Rxc2 Nxf1 30.Kxf1=] 27.Bxd6 We both missed crushing 27.Bf5 black would have completely lost after that. 27...Qxc2 28.Rxc2 Nxg4 29.Ba3? I was somehow releaved. I equalized it. [29.Rc8+ Nf8 30.Nf3+/-] 29...Ne3 [29...e4 30.Bxe4 Bd4+ 31.Kh1 Ne3© Nice compensation for the pawn.] 30.Rc8+ Bf8 31.Nc2 Nxf1 32.Kxf1 Kg7 33.Bc4 Rxa3 34.Nxa3 Ne7? Bad move caused by miscalculation. [34...Bxa3 35.bxa3 Much better than what I did! Position is totally equal. The reason I didn't play is maybe I was scared to draw. I just hate draws. That's obvoisly not good attitute if the position calls for a draw. Overaggresiveness is what kills me the most. Once i know I equalized the position, I start thinking about winning. Not good!] 35.Rc7 Rf6 36.Nb5 Kh6 37.Rxb7 Nf5 38.b3 Crazy, houdini thinks after this move white doesn't have any advantage. I had no idea that i still had some chance to save the game. 38...Ne3+ 39.Kf2 e4? Last serious mistake that caused to lose. [39...Rg6 40.Kf3 Rxg2 Unbelievable, this is pretty close to draw.] 40.Nc3 He eventually went on and win the game. The endgame was tough to hold. *

No fun to began  the tournament losing the first round, but it was quite a fighting game. I fought back hard untuil I blundered the equal endgame.  

Round 2:           UYANGA BYAMBAA (2075) - RANDALL D HOUGH (2033)             10/18/13

Position after 32...f6

We reached this interesting endgame after move 32. My evalution of the postion was favorable for white until I realized his passed pawn on the queenside can be very dangerous.
33.gxf6+ Kxf6 Oh boy! He's gonna have a passed pawn supported by his rook and king. I don't think i have a way to stop that except I could sacrifice one of my miner pieces. 34.Nd2 Not the best! 34.Bd7 is more accurate! 35...g5 3.hxg5+? Again, 35. Bd7 is almost stops blacks's dangerous pawn. Now black has a good chance to win. [35.Bd7 gxh4 36.Nf3=] 36...Kxg5 36.Bd7 Now, it's a little too late :( 36...Kf4 37.Bf5 h4 38.Kc2 h3 39.Nf1 h2 40.Nxh2 Rxh2+ 41.Kb3 Re2? [41...Ke3 wins] 42.a4 ba 43.ab Rxe4 44.Bxe4 Kxe4 45.Kc4 rest is forced draw. *

A perfect example of how rook can dominate two miner pieces. it's amazing how this position can be turn around and white is the only one who fights for the draw.
In Round 3, I won with white scoring my first full point. 

Round 4:           PHILIP IRWIN (1905) - UYANGA BYAMBAA (2075)        10/19/13

Position after 39. Qg6+
Here is the critical position that arose from the forced line i chose. Throughout the whole game, I had a proming advantage without any difficulties. When i go into that line, i thought i can win easily. Nevertheless, chess is never easy even when you think you'r completely winning. Because of the mind set that i was winning the most part of the game, it didn't occur to me that king and pawn ending  I'm about to go into was a draw. Without considering the deep calculation after trading the queens, I played 39...Qe4? very carelessly (39... Kd2! would have been promising win for black).  40.Qxe4 Kxe4 41.Kg2 Kf4 42.c5 b6 43.cxb6 axb6 44.a3 c5 45.a4 Kg4?? [45...Ke4 46.Kh3 Kd3 47.Kxh4 Kc3 48.Kg4 Kxb3 49.h4 c4 50.h5 c3 51.h6 c2 52.h7 c1Q 53.h8Q Kxa4-/+] 46.h3+ Kf4 47.Kf2 Ke4 48.Ke2 Kd4 49.Kd2 Ke4 50.Ke2 Ke5 51.Ke3 Ke6 52.Ke4 Kd6 53.Kd3 Kd5 draw agreed.
Tip: Don't go into the king and pawn ending unless you are hundred percent sure that you'll win. 

After the game, I was really disappointed with myself. I could've played much better the entire time. Due to my laziness, carelessness and impatience, I threw the win away. I was really upset. Perhaps I let my emotions effect my performance in the next round which resulted in a loss. Overall, 2 losses, 2 draws and 2 wins, which cost me  (-30) rating points.

In the Open section of Western State Open, GM Jesse Kraai, GM Alexander Ivanov, GM Melikset Khachiyan, GM Sergey Kudrin, GM Enrico Sevillano, and FM/SM Ronald Cusi scored 4.5 out of 6.
Congratulations GM Jesse Kraai who won the playoff!

 Also, congratulations to my friend Cailen Melville who won the B section! 
with Cailen Melville and Bryon Doyle, celebrating Cailen's victory!

My Reno tournament experiences go way back.  For some reason, I have always had a bad tournament in Reno although I enjoy going every time. Sadly This Western State open may be my last tournament in Reno even though it has been a great tournament and a great place!

The first time in reno, October 2011

Larry Evans memorial, April 2013 /Playing against  6-time US Champoin GM Walter Brown/ 

With friend exploring the casinos

Monday, March 11, 2013

Golden state open 2013

After I had a very discouraging tournament, North american open in Vegas (open section), my anger and frustration made me enter in Golden state open without any doubt. But the question is that should I enter in Open section or U2200? Although the open section's entry fee was twice as cheaper than other sections (because i'm foreign fide rated player), I decided to play in U2200 to build my confidence.

I've been playing Golden State open since 2010. In 2010 and 2012,  I had a really bad tournament whereas in 2011,   I finished off with 5 points in  U2000 section with $300 prize money.  Golden State open 2013 in U2200 section  was the most successful tournament I've played so far and scored full 6 points for clear 2nd and pocketed $1000.
Golden State open 2013, Round 7
With calm and confidence working on my 6th win
There are some advantages helped me to do well. Golden state open is one of the biggest tournaments of  CCA (Continental Chess Assossation) in Bay Area, where I don't have to travel long since it's only 30 min drive from where i live. During the tournament days, I was resting very good and providing myself homemade food I cooked. Having a good sleep and good food are very important when you playing in chess tournaments. Thinking all day long behind the board requires a lot of energy and patience. Not an easy task! It can make people very exhausting and hungry.
Between the rounds in my free time I was trying to keep myself concentrated as much as possible. As an adult, there are so many things to worry about in life. It's not easy to forget about everything and think about chess for days without any distraction. So, I made a "Tournament Do or Do Not list" to remind myself some important but simple stuff in chess. The list can be created based on your own weaknesses that you think you need to improve. I wrote,  1."Do what the position wants you to do", 2."Do Not intimidate with your opponent. Play with your board, not with the person" and etc. This was another way that I was trying to discipline myself. On the other hand, How should I discipline myself after I lost? Losing is the worst part of the tournament. Most of the times,  it is too heartbreaking and too difficult to handle. This is the another psychological challenge for every chess player. After my 4th round which I lost, I was devastated because I thought I was  completely winning. After the game, I analyzed with my friend and realized it wasn't that simple as i thought. I misjudged the certain position and underestimated my opponent's two connected passed pawns while I was enjoying my extra piece. I still had one more game to play that day, obviously, it wouldn't be a good idea to regret and be miserable. So, I decided to play some ball with my friend to get my mind off of chess. Amazingly, it actually worked. I came back energetic and win my next round convincingly. That was the most exciting game on this tournament.
At last, I wanna say preparation is the key to success. A preparation gives you a confidence, a confidence can make a power. Chess is too complex to prepare although we can narrow it down by reviewing opening lines, studying tactics or working on your own games. Recently, I just picked up a new opening line for black, in which needs a tremendous study. It's not necessary to know everything in the opening but it is necessary to know your middlegame plan and what you'r doing. What I did in my preparation was very simple; mainly, I reviewed my openings to make sure I can reach a reasonable position to go on and worked on my games and mistakes to make sure I don't repeat them. I don't really think that what you are preparing is important, what's important is a preparation itself. Whatever you prepare can enhance your confidence to get you ready for the brutal chess battle.

Here is my games with an annotation:

3 day schedule, G/75  Jan 19, Round 1:

Uyanga Byambaa - Charles Tang [C10]
Golden State Open 2013 (1), 19.01.2013

Position after 16. Ra4

1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Bd3 Ngf6 6.Nf3 Nxe4 7.Bxe4 Nf6 8.Bd3 c5 9.0-0 cxd4 10.Nxd4 Bc5 11.Nb3 Bb6 12.a4 0-0 13.Bg5 Qd5
He allowed his king to be exposed a little bit and remained to have a pair bishops. [13...h6 14.Bf4 Nd5 15.Bg3 ]

14.Bxf6 gxf6 15.a5 Bc7 16.Ra4
Nice rook lift! One more piece join the attack besides bishop's aiming to h7 and queen placed on a nice diagonal d1-h5. However, black has a lot of sources he can defend.

16...f5 17.Rh4 Qe5 18.f4?
Hanging b2 pawn wasn't really smart in this case because it's not a poisoned pawn. [18.Qh5 Qg7 19.f4 Qg6 20.Rf3 Qxh5 21.Rxh5 f6 22.Bc4 Kh8 23.Nd4 ]

18...Qf6 19.Rh3
[19.Qh5 again this was the best but I just didn't want to exchange my queens after he plays 19... Qg6. Unfortunately, keep hesitating to exchange off my queen worsened my position gradually. ]

19...Kh8 20.Rff3
threatening Rxh7+!

20...Rg8 21.c3 Rg4 22.Rfg3 Rxg3 23.hxg3 e5 24.fxe5 Bxe5 25.g4 Be6
both sides having a little bit of time pressure at this moment.

26.Nc5 Rg8 27.Nxe6 fxe6 28.gxf5 exf5 29.Qf3 b6 30.Bxf5 Rg7 31.Qa8+
black resigned. 1-0

Round 2:

Anthony Alexander Blessing - Uyanga Byambaa [E97]
Golden State Open 2013 (2), 19.01.2013

Position after 33....Bb3

1.Nf3 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.d4 0-0 6.Be2 e5 7.0-0 Nc6 8.Be3 Ng4 9.h3 Surprising move! I didn't think he could give up his dark square bishop in this position where the dark square bishop is very importand to have. However in return, white is obtaining the half open f-file. Nxe3 10.fxe3 Bh6 Now, he has some dark square problem's since the bishop is gone, so start attacking his weak dark squares. 11.Nd5 Be6 12.Kh1 Kh8 13.Nc3 Threatening to fork on d5. Bd7 14.Nd5 a5 15.Qb3 Qc8 16.Qc3 Bg7 17.Rad1 Nb4 18.a3 Nxd5 19.exd5 f5 20.dxe5 dxe5 21.e4 f4? fxe4 was better. 22.c5 Qe8 23.Rc1 Qe7 24.c6 bxc6 25.dxc6 Be6 26.Qc5 Qf6 27.Rfd1 Rfb8 28.Rd2 g5 that's where time trouble started. 29.Nh2 Bf8 30.Qc2 Rd8 31.Rcd1 Rxd2 32.Rxd2 Rd8 33.Bg4 Bb3! 34.Qc3 Rxd2 35.Qxd2 Qxc6 Black stands clearly better however; because of time trouble I made a lot of lousy moves that are leads to almost a draw. Luckily, my opponent blunder really bad at the end when he had only few seconds on the clock. 36.Nf3 Bd6 37.Nxg5 Kg7 38.Bf5 h6 39.Nf3 a4 40.Qf2 Qc1+ 41.Kh2 Bd1 42.Qe1 0-1


Uyanga Byambaa - Ed Cohen [C50]
Golden State Open 2013 (3), 07.02.2013

Position after 19. h4

1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7 4.d4 exd4
[4...d6 5.dxe5 ]

5.Nxd4 Nf6
[5...d6 ]

6.Nc3 d6 7.0-0 0-0 8.h3 a6 9.a4 Bd7 10.Be3 Ne5 11.Bb3 c5 12.Nf5 Bc6!?
it was very necessary to chop off my strong knight. My knight on f5 is much stronger than his bishop, so he shouldn't let my knight sit there forever. 13.Bd5  [13.f4 Ng6 14.Qf3 ]  13...Re8 14.f4 Ng6 15.Bxc6 bxc6 16.Qf3 Bf8 17.Rad1 Qc7 18.g4 h6 19.h4 Fearless. My plan is simple; just attack his kingside since he doesn't have any counterplay on queenside or even center. Re6 20.h5 Nh8 21.g5 Pawns are just keeps coming,  trying to open up the position. Nxe4? Unfortunately, his position is too cramped and that makes him play a dubious move like that.   22.Nxe4 Rae8 23.Neg3 g6 24.gxh6 gxf5 25.Nxf5 Another knight sits on the f5 square. Kh7 26.Kh1 f6 27.Rg1 Qf7 28.Bf2 Bxh6 29.Nxd6 Qc7 30.Qd3+ Black resigned. 1-0

 A Perfect score so far. Very nice start!

Jan 20, Round 4:

Siddarth Banik - Uyanga Byambaa [B33]
Golden State Open 2013 (5), 04.02.2013

Position after 27.Qd5

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Nd5 Be7 10.Bxf6 Bxf6 11.c4
[11.c3 ]

11...b4 12.Nc2 a5 13.g3 0-0 14.Bg2 Bg5 15.0-0 Be6
[15...Ne7 ]

16.b3 Ne7 17.f4 Bh6
[17...exf4 18.Nxf4 ]

18.Qh5 f5?
[18...Bxd5 19.cxd5 (19.exd5 Qb6+ 20.Kh1 exf4=/+ ) ]

19.fxe5 Bxd5 20.exd6
[20.exd5 dxe5 21.d6 Qxd6 22.Bxa8 Rxa8 23.Rad1 Qc5+ 24.Kg2+/= ]

20...Bf7 21.Qd1 Nc6 22.c5 fxe4?
[22...Qd7 23.Rxf5 Be6 24.Rxf8+ Rxf8 25.Qe2 ]

23.Bxe4 Rc8 24.Rxf7 Rxf7 25.Bd5 Ne5?
[25...Qf6 26.Qe2 Qf5 27.Rd1 Rcf8 ]

26.Bxf7+ Nxf7 27.Qd5 Qg5?
[27...Qd7= ]

28.d7 Rd8 29.Re1 Kf8 30.Qc6 Ne5 31.Qd6+ Qe7 32.Rxe5 Qxd6 33.cxd6 Rxd7 34.Rxa5 Bd2 35.Rd5 Bc3 36.a3 bxa3 37.Nxa3 Kf7 38.Nc4 Ke6 39.Rd3 Bb4 40.Kf2 h5 41.Re3+ Kf5 42.Re5+ Kg6 43.Ke2 Bc3 44.Kd3 Ba1
the rest was very straightforward win for white. 1-0

Round 5:

Uyanga Byambaa (2094) - Joshua Cao (2035) [B33]
Golden State Open 2013 (5), 30.01.2013

Position after 18.c4

1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5 11.Bxb5 
I could've gone for main line 11.Bd3 but I found this move very interesting. Sac probably not that sound although this side line is very playable. In my opinion, position is unclear. 

11...axb5 12.Nxb5 Rb8 
Inaccuracy! 12...Ra4 should've been played. The idea behind that is threatening to take e4 pawn with check, so white forced to castle, which slows his attack by one move. [12...Ra4 13.Nbc7+ Kd7 14.0-0 Rxe4 15.Qh5 Ne7 16.Qxf7 Kc6 17.c4~~ ] 

13.Nbc7+ Kd7 14.Qh5 Ne7 15.Qxf7 Rb7? 
[15...Kc6 16.b4 Nxd5 17.b5+ Rxb5 18.exd5+ Rxd5 19.Qxd5+ Kxc7 20.Rb1 ] 

16.Ne6 Qa5+ 17.b4 Qb5 18.c4 
[18.a4! Qc4 19.Nf6+ Kc6 20.Nd8+ Kc7 21.Qxc4++- ] 

18...Qxc4 19.Nb6+ Rxb6 20.Nxf8+ Rxf8 21.Qxc4 Ba6 22.Qb3 Nc6 23.a3 fxe4 24.Rc1 Bd3 25.f3 Nd4 26.Qa4+ Ke6 27.fxe4 Ra6 28.Qd1 Rxa3 29.Qg4+ Kf6 30.Qh4+ Kg6 31.Qg3+ Kh6 32.h4 Rf4 33.Qg5# 1-0

Jan 21, Round 6:

Paul Richter - Uyanga Byambaa [B30]
Golden State Open 2013 (6), 04.02.2013

Position after 24....Rad6

1.e4 c5 2.Nf3 Nc6 3.Nc3 g6
[3...e5 4.Bc4 Be7 5.d3 d6 6.Nd2 Nf6 7.Nf1 Bg4 8.f3 Be6 9.Ne3 0-0 10.0-0 Rb8 11.Ned5 Nd4 12.a4 Nxd5 13.exd5 Bc8 14.Ne4 f5 15.Nxc5 dxc5 16.d6+ Be6 17.Bxe6+ Nxe6 18.dxe7 Qxe7 19.Re1 Qd6 20.c3 Rbd8 ]

[4.d4 ]

4...Bg7 5.0-0 e6 6.d4 cxd4 7.Nb5 d6 8.Nfxd4 Nxd4 9.Nxd4 a6 10.c3 Ne7 11.Bg5 h6 12.Bh4 0-0 13.Re1 Qc7 14.Bb3 Nc6 15.Nxc6 bxc6 16.Qd2 a5 17.Bg3 e5 18.f3
[18.Rad1 Rd8 ]

18...a4 19.Bc4 Ba6 20.Bxa6 Rxa6 21.Bf2 Rd8 22.c4 d5!? 
A Pawn sac in order to dominate the d- file. 23.cxd5 cxd5 24.exd5 Rad6 25.Rad1 Qc4 26.Ra1? This was his only serious mistake. Rxd5 27.Qe2 Qb4 28.Be3 e4 29.fxe4 Qxe4 30.Bb6 Qxe2 31.Rxe2 Rb8 32.Bc7 Rb7 33.Rc1 Bxb2 34.Rc4 Bd4+ 35.Kf1 Rb1+ 36.Re1 Rf5+ resign 0-1

Round 7:

Uyanga Byambaa - Jamsh Alamenzadex [C41]
Golden State Open 2013 (7), 07.02.2013

Position after 29....Rxe5

1.e4 d6 2.d4 Nd7 3.Nc3 e5 4.dxe5 dxe5 5.Nf3 c6 6.Bc4 Be7 7.0-0 Ngf6 8.Bb3 h6 9.h3 g5 Unexpected move! it's hard to believe that he was trying attack me on kingside. At first glance, it looked way premature but it might be resourceful. 10.Nh2 Nc5 11.Qe2 Nxb3 12.axb3 Bd7 13.Be3 b6 14.Rfd1 Qc8 15.Qa6 0-0 16.Qxc8 Rfxc8 17.Nf3 Be8 18.Nxe5 Now I'm a solid pawn up and have the important open file. Nh5 19.Ng4 Kg7 20.e5 Nf4 21.Ne4 c5 22.Bxf4 gxf4 it's true he has the pair bishops but are they better than my knights? Answer is NO. My knights are well placed, more active and if it's necessary i can always trade them off with his bishops. .23.Nd6 Rc7 24.Nf5+ Kg6 25.Nxe7+ Rxe7 26.Rd6+ Re6 27.Rad1 h5 28.Nf6 Kf5 29.Nxh5 Rxe5 30.g4+ fxg3 31.f4 Re3 32.Kg2 Re6 33.R1d5+ Kg6 34.f5+ Kxh5 35.fxe6+ f5 36.Rxf5+ Kg6 37.Rf4 Rc8 38.e7+ Kg5 39.Kxg3 Black resigned. 1-0

Here is the result:

Final Standings

#NameRtngStRd 1Rd 2Rd 3Rd 4Rd 5Rd 6Rd 7Tot
1Siddharth G Banik2033CAW60W49W30W2W7W11D46.5
2WFM Uyanga Byambaa2094CAW31W20W54L1W12W10W76.0
3Jack Qijie Zhu2180CAL20W26D51W40D15W27W115.0
4Udit Iyengar2091CAD38L29W36W32W28W17D15.0
5Steven Gaffagan2078CAW39D40D24D30W51D21W225.0
6Scott Treiman2072UTL40W66W16W29L11W23W215.0
7Jamsh Alamehzadeh1961CAW57W17W37W42L1W26L25.0
8Matthew K Ng2167CAH—H—D31W41D19D15W244.5
9Michael Wang2080CAW45L30L38W52W33W19D134.5
10Paul Richter2070CAW46D48W40D21W24L2D144.5
11Benjamin X Tong2053CAW41W56D21W22W6L1L34.5
12Joshua Cao2035CAL48W45W14W38L2W29D154.5
13Ethan Li2033AZD24D16D32W59D29W42D94.5
14Valeriy Timofeyev1975CAD33D52L12W46W45W25D104.5
15Yuan Wang1954CAH—H—W53W54D3D8D124.5
16Damon S Mosk-Aoyama1917CAH—D13L6D60W59W37W314.5
17Greg Kenneth C Lope2071CAW23L7W25W37D21L4H—4.0
18Kevin Moy2009CAH—L24L41W49D32W52W334.0
19Praveen Narayanan2002CAL49W46D59W48D8L9W474.0
20Anthony Alexander Blessing1997CAW3L2W61L24D37D30W424.0
21Ivan Troufanov1985CAW59W61D11D10D17D5L64.0
22Rayan Taghizadeh1981CAH—W43W33L11D25W35L54.0
23Christopher Au1947CAL17W57H—H—W53L6W434.0
24Peter Thomas Korzeb1920HID13W18D5W20L10W50L84.0
25Tony Sung Yim r/e2163AZD28W55L17W47D22L14H—3.5
26Walter Chan2150CAD36L3W49W31W30L7U—3.5
27Ethan Xie2015AZD43L33W44W56D35L3D303.5
28Felix Rudyak1956CAD25W50L42W57L4W51U—3.5
29Ashritha Eswaran1934CAH—W4W48L6D13L12D343.5
30Arvind Sankar1916CAW35W9L1D5L26D20D273.5
31Charles Tang1906CAL2W60D8L26W58W38L163.5
32WIM Ruth Inez Haring1900CAW62L54D13L4D18D36W553.5
33Michael S Ho1876CAD14W27L22W58L9W40L183.5
34Eric Alan Steger1867CAH—H—U—L53W46W39D293.5
35Igor Vladim Traub2112CAL30W36D56W43D27L22U—3.0
36Edward Li1977CAD26L35L4W44D47D32D413.0
37Brendan* Lacounte r/e1974CAW47W42L7L17D20L16D403.0
38Theodore Alexander Biyiasas1969CAD4D53W9L12D50L31D443.0
39Michael A Schemm1927WAL5L58L46B—W61L34W543.0
40Abhishek Handigol1924CAW6D5L10L3W56L33D373.0
41Nils Delmonico1922CAL11D62W18L8L52W56D363.0
42John Natha Morcos1919CAW50L37W28L7W54L13L203.0
43Nikunj C Oza1919CAD27L22W62L35D48W55L233.0
44Ojas Chinchwadkar1915CAL54H—L27L36W49W59D383.0
45Noah Dennis Fields1887WAL9L12W66W61L14H—H—3.0
46Vikram Vasan1844CAL10L19W39L14L34W60B—3.0
47Greg M Sarafian r/e1829CAL37B—D55L25D36W54L193.0
48Anirudh Seela1822CAW12D10L29L19D43H—H—3.0
49Ben Rood1698CAW19L1L26L18L44W68W603.0
50James E Jones2007CAL42L28W57W55D38L24U—2.5
51Vikram Ganesh1899CAX65H—D3H—L5L28U—2.5
52Joanna Liu1823CAH—D14D58L9W41L18U—2.5
53Farid Mark D. Watson2040CAH—D38L15W34L23U—U—2.0
54Ed Cohen2000CAW44W32L2L15L42L47L392.0
55Rodell E Mapp1989CAH—L25D47L50W60L43L322.0
56H. G. Pitre1905WAW58L11D35L27L40L41H—2.0
57Patrick Le Enrico1800CAL7L23L50L28B—H—H—2.0
58Ethan John Chamberlain1994CAL56W39D52L33L31U—U—1.5
59Andrew Roach1895UTL21W63D19L13L16L44U—1.5
60Jeffrey Wei1754CAL1L31B—D16L55L46L491.5
61Peter Gaffney1754CAW66L21L20L45L39U—U—1.0
62Hovik Manvelyan1990CAL32D41L43U—U—U—U—0.5
63Walter Lesquillier1770CAU—L59U—D64U—U—U—0.5
64Scott Cameron1433CAU—U—U—D63U—U—U—0.5
65No Player1988CAF51U—U—U—U—U—U—0.0
66Brendan A Lacounte1974CAL61L6L45U—U—U—U—0.0
67Bryon J Doyle1952UTU—U—U—U—U—U—U—0.0
68Aldrich Ong1796CAU—U—U—U—U—L49U—0.0
69Arul Viswanathan1370CAU—U—U—U—U—U—U—0.0