- The Washington Times - Friday, May 11, 2007

In a battle of unbeatens, IM Oladapo Adu defeated expert Enkhbayar Janchivnyambuu in their decisive last-round encounter to take clear first in the George Mason Open held the weekend of April 28 and 29. A total of 73 players competed in the tournament, held at the university’s Arlington campus.

Baltimore expert Josh Zwingli was alone in second, a half-point back at 4 1/2-1/2. Janchivnyambuu, who upset FM John Meyer on his way to a 4-0 start, finished in a seven-way tie for third with FM Rodion Rubenchik, Avi Cohen, Matt Grinberg and scholastic players Katherine Wu, Darwin Li and Daniel Clancy.

Tournament Director Mike Atkins reports that Wu, rated 1603, ran off four straight wins after her Round 1 loss, including another upset of Meyer, to post a performance rating of 2167 and take home the Class B prize.

The tournament’s critical game turned on a pair of bishops, one good and one very bad. In a Queen’s Gambit Slav, Adu exploits White’s decision to lock up the queen-side with 5. c5, maneuvering into a position where his bishop clearly outranks its White counterpart, which is hemmed in by his own pawns.

White’s queen-side edge in space proves worthless compared to Black’s pressure in the center. The exchange of light-squared bishops on 20. exd4 Bxd3 21. Qxd3 only magnifies the power of Black’s remaining bishop, and by 22. f5 23. Rxe4 fxe4 24. Qe3 Qf5 25. Qg3 Rf8 26. h4 h6, Adu’s positional dominance is complete.

With White’s pieces reduced to passive defense, Black breaks things open with a powerful shot: 28…Qg4 29. g3 (the h-pawn could not be saved) Bxh4 30. Kh2 Rf5! 31. gxh4 Rh5, and the Black queen-and-rook battery will prove irresistible.

There followed 32. Qg3 (Qg2 Rxh4+ 33. Kg1 Qf5 34. Kf2 [Bf2 Rg4 35. Bg3 h5, and the bishop can’t escape the pin] Qh5! 35. Ke1 [on 35. Kg1, 35…Rh2+ wins] Rh2 36. Qg3 Qe2 mate) Rxh4+ 33. Kg2 Qh5!, when 34. Kf2 Rh2+ 35. Kg1 Rh3 36. Qf2 Rh1+ 37. Kg2 Qh2 is mate.

White’s 34. Rg1 works out no better in the long run after 34…Rg4 35. Kf2 Rxg3 36. Rxg3 Qd1, when White’s rook and bishop are no match for the rampaging queen. In the final position, White will lose the rook after 41. Rg6 Qh5+; Janchivnyambuu resigned.

––

The Round 2 donnybrook between expert Douglas Stanley and Class A player Tyler Cook packed a lot of entertainment into a modest number of moves. The game is a classic Sicilian Dragon slugfest, with White pressing a mating attack on one flank while trying to stave off disaster on the other.

With the kings castled on opposite wings, the fun begins with 12. Bh6 Ne5 13. Nf5!?, with Stanley rightly reckoning that an open g-file is worth far more than a mere knight in this kind of game. But Black has his resources, too.

There followed: 13…Nxf3 14. Qf4 gxf5 15. gxf5 (the insipid 15. Qxf3? fxg4, shutting down White’s attack, isn’t worth analyzing) Bxh6 16. Qxh6 Rxc3! (Qb6? 17. Be2 Ne5 18. Rhg1+ Neg4 19. Bxg4 Nxg4 20. Qxh5 wins for White) - Black’s classic Sicilian countersacrifice, removing the key White piece defending his center.

White seems to come to grief if he stops to take the rook: 17. bxc3?! Qa5 18. Be2 Qxc3 19. Bxf3 Rc8 20. Rdg1+ Ng4 21. Rg2 Ba4! (threatening 22…Qa1+ 23. Kd2 Rxc2+ 24. Kd3 Qc3 mate) 22. Bxg4 Qa1+ 23. Kd2 Rxc2+ 24. Ke3 Qc3+ 25. Kf4 Rxg2 and wins.

But the critical position arises on the game’s 17. Be2 (see diagram), when Black has a fascinating option in 17…Ne5 18. Rdg1+ Neg4. White has to break down the g-file barrier if his attack is to succeed, but things quickly get hairy after 19. Bxg4 hxg4 20. Rxg4+ Nxg4 21. Rg1 Bxf5! 22. exf5 Rxc2+!!, when Black can defend after 23. Kxc2 Qc8+ and 24…Qxf5.

White can sidestep that with 23. Kd1, but then Black has 23…Rc1+!! 24. Qxc1 (Kxc1 Qc8+ 25. Kd1 Qxf5 holds again) Kh7 25. Rxg4 Rg8 26. Rg5 Rxg5 27. Qxg5, and the queen ending is probably drawn.

Back in the real world, Black can’t find the best defense with the clocks ticking: 17…Nxe4? 18. bxc3 Bxf5 (Nfg5 19. Rdg1 Bxf5 20. Bd3 is strong) 19. Bxf3 Nf6 20. Rhg1+ Bg6 21. Bd5!, a crushing move that presents Cook with insoluble defensive problems.

The bishop pins the Black’s f-pawn, but removing the pin with 21…Nxd5 leaves the Black king totally exposed: 22. Rxg6+!! fxg6 23. Qxg6+, and the king can’t escape the mating net. The conclusion: 23…Kh8 24. Qh6+ Kg8 25. Rg1+ Kf7 26. Qg6 mate.

–-

Churchill High freshman Shinsaku Uesugi already has a nice line to add to his college application: national chess champion of Japan.

The rapidly improving 16-year-old master won the Japanese national title on tiebreaks last Saturday in Tokyo, scoring 9 1/2-3 1/2. Japan is not exactly a world chess power, but it’s impressive nonetheless. Thirty-nine players competed in the event, and Uesugi is the country’s youngest champion ever.

Uesugi, who was born in Japan, also took the U.S. national ninth-grade title in December.

GMU Open, Arlington, April 2007

EnkhbayarAdu

1. d4 d5 21. Qxd3 Re4

2. c4 c6 22. Rae1 f5

3. Nf3 Nf6 23. Rxe4 fxe4

4. Nc3 a6 24. Qe3 Qf5

5. c5 Bf5 25. Qg3 Rf8

6. Bf4 Nbd7 26. h4 h6

7. Qb3 Qc8 27. Be3 Bd8

8. Na4 e6 28. Qf2 Qg4

9. Ne5 Be7 29. g3 Bxh4

10. Nxd7Nxd7 30. Kh2 Rf5

11. Nb6Nxb6 31. gxh4 Rh5

12. Qxb6Bd8 32. Qg3 Rxh4+

13. Qb3Ba5+ 33. Kg2 Qh5

14. Bd2 Bc7 34. Rg1 Rg4

15. Qc3 0-0 35. Kf2 Rxg3

16. e3 Re8 36. Rxg3 Qd1

17. f4 f6 37. Kg2 Qb1

18. Bd3 e5 38. Kh3 Qxb2

19. 0-0 exd4 39. Kg4 Kf7

20. exd4 Bxd3 40. Kf5Qh2

White resigns

GMU Open, Arlington, April 2007

StanleyCook

1. e4c514. Qf4gxf5

2. Nf3 d6 15. gxf5 Bxh6

3. d4 cxd4 16. Qxh6 Rxc3

4. Nxd4Nf617. Be2 Nxe4

5. Nc3 g6 18. bxc3 Bxf5

6. Be3 Bg7 19. Bxf3 Nf6

7. f3 0-0 20. Rhg1+Bg6

8. Qd2 Bd7 21. Bd5 Nxd5

9. 0-0-0Nc6 22. Rxg6+hxg6

10. g4Rc8 23. Qxg6+Kh8

11. h4 h5 24. Qh6+ Kg8

12. Bh6Ne5 25. Rg1+ Kf7

13. Nf5Nxf3 26. Qg6 mate

David R. Sands can be reached at 202/636-3178 or by e-mail at dsands@washington times.com.

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