Truelsons dominate SDCA again
The Truelsons dominated the summer SDCA tournaments. The Truelson team won the South Dakota Teams at Oacoma drawing only one match.. Nels took Board one prrize while his son. Nick Truelson won the board 3 prize. The Truelsons got out quickly crushing Sioux Falls One in the first round. After Sioux Falls could only draw with last years champions Merchants of Death, the Sioux Falls team was merely playing out the string. This draw however neant that the Merchants of Death would need a win over the Trulesons. They were
only able to get a drawn match with the Truelson. On board two Randall Koeller tied with Serif Suljic with Randall winning the head to head meeting. Dan Merchant won the board four prize It was decided that next years Teams would be in Pierre.
Nels tied with Lyle Hanson at the Closed for South Dakota State Champion.. They drew their head to head game and then drew the playoff so we have joint champions for the first time since 1982.This was Nels’s fourth championship and Lyle’s third championship.. Nick Truleson was able to win his third straight junior title despite losing his head to head game with Isaac Gerdes.
This is the second time that I have
this tournament. I did not see myself as a threat to winning the State Championship. I have always enjoyed the Teams because there was a more
been elected SDCA President. Both times I was not present at the meeting at which I was elected. The moral of the story is to attend the SDCA annual meeting if you do not want to be elected president. Recently
I received a phone call blaming me as SDCA president for the low attendance at the South Dakota Closed. I have only played twice in the Closed at the 1990 and 1993 tournaments in Rapid City. I only atteneded these tournaments because I had been forced to miss the South Dakota Team Tournament Personally I have never had any attraction for this atteniding
relaxed atomosphere and you could find satisfaction in your teams success even if you were not doing well I have some success at the Teams winnning
2 THE BULLETIN OF THE SOUTH DAKOTA CHESS ASSOCIATION OCTOBER 2003
three board prizes and playing on three winning teams.Since the mid 1990s I have become moreof a tournament director than a tournament. In addition, I have emphasized scholastic chess in tournaments which I have directed.Below is list of the numbers of players at South Dakota Closed tournaments since I moved to South Dakota. The numbers havelways been low. In fact the SDCA Annual Meeting which used to be at the Closed was moved to the Teams because the Teams had higher.We tried to solve this problem by having a separate Junior tournament with a cheap entry to Juionrs who wanted to enter after their tournament was at end We ended the separate junior tournament in 2001. Since then numbers have been below 20. Maybe we need to look at the Closed. North Dakota has opened its Closed.South Dakota has not run an Open Championship since 1970. Nebraska runs a 6 person Closed championship where persons qualify by winning various tournaments. You can contact me at Wes Schmidt,2213 E.Tricia Lane,Sioux Falls,SD 57103, 6053392248emailsaschmidt@prodigy.net. if you have any suggestions on improving the Closed. I personally am going to recommend moving the Closed to Sioux Falls for next year. Wes Schmidt 1983 19 Aberdeen
1984 26 Rapid City
1985 20 Sioux Falls 1986 Huron
1987 16 Rapid City
1988 24,Sioux Falls 1989 17,Pierre
1990 28, Rapid City 1991 24 Sioux Falls 1992 15,Pierre
1993 15. Rapid City. 2 Junior 1994 27. Sioux Falls, 5 Junior 1995 18 Rapid City,3 Junior 1996 23 Sioux Falls,9 Junior 1997 28 Pierre.8 Junior 1998 23 Pierre,10 Junior
1999 28 Oacoma,6 Junior 2000 26 Oacoma,8 Junior 2001 19 Oacoma 2002 18 Oacoma 2003 13 Oacoma one below. After you have created several headings, the "Table of Contents" button will automatically generate a table of contents.
CLUB NEWS
Sioux Falls
..Nels Truelson’s Sioux Falls Chess League meets on the third Thursday of each month from October to May. from 6:30 10:00 pm For more information call 371 4535 or contact Nels at NTruelson@aol.com Sioux Empire Chess Club meets at the Kenny Anderson Community Center,3rd &Bahson, Sioux Falls, SD on the first, second and fourth Thursdays of each month from 6:30 10:00pm Dick Rostrom is in charge 338 4277
PIERRE CHESS CLUB Contact Bob Wallace, PO Box 416, Pierre, SD 57501
Brookings Chess Club Contact Bruce Brandt work 605/688 4058 home 605/5789email: brand73 @home.com.
Madison Chess Club Contact Jud Bergan 605/256 6781Email: berganj@hcpd.com
Rapid City Chess Club meets at Interstate Hardees meeting room, 2250 Haines Ave., Rapid City, SD Thursdays at 7pm. Contact Terry Likens 605/348 1015 E mail: sdchess @rushmore.comm
Rapid City chess Club Championship Vermillion The USD Chess Club meets at the Coyote Student Center, Sunday at 7:pm. Contact chess#usd.edu or L.J Ottenbacher at jottenba@usd.edu or Mark Derby 605/624 7823 or E mail mderby@usd.edu
2003 South Dakota Team Championship2003 South Dakota Team Championship ,Oacoma,SDJune 21-22,2003
Team Rating Rnd 1 Rnd 2 Rnd 3 Rnd 4 Rnd 5 Total
1Truelsons and Friends (4)1662 W6,3.0 W4,2.5 W5,2.5 D2,2.0 W3,3.5 4.5
2Merchants of Death (6) 1662 D3,2.0 W5,3.5 W6,3.5 D1,2.0 W4,4.0 4.0
3Sioux Falls One (3) 1695 D2,2.0 W6,3.0 D4,2.0 W5,3.0 L1,0.5 3.0
4Pierre (1) 1700 D5,2.0 L1,1.5 D3,2.0 W6,3.5 L2,0.0 2.0
5West River Rats (5) 1553 D4,2.0 L2,0.5 1,1.5 L3,1.0 W6,4.0 1.5
6De's Efforts Team (2) 1265 L1,1.0 L3,1.0 L2,0.5 L4,0.5 L5,0.0 0.0 Board 1
Player Rating Rd 1 Rd 2 Rd 3 Rd 4 Rd 5 Total
1Truelson, Nels W, Truelsons and Friends2200 W6 W4 D5 W2 W3 4.5
2Hanson, Lyle A, Merchants of Death 1822 D3 W5 W6 L1 W4 3.5
3Horton, Louis A, Sioux Falls One 1839 D2 W6 D4 W5 L1 3.0
4Carroll, Curtis L, Pierre 1858 D5 L1 D3 W6 L2 2.0
5Likens, Terry Dean, West River Rats 1807 D4 L2 D1 L3 W6 2.0
6Kieffer, Clarence, De's Efforts Team 1400 L1 L3 L2 L4 L5 0.0 Board 2
Player Rating Rd 1 Rd 2 Rd 3 Rd 4 Rd 5 Total
7Suljic, Serif, Merchants of Death 1785 L8 D9 W11 W10 W16 3.5
8Koeller, Randall S, Sioux Falls One 1732 W7 D11 D14 W9 D10 3.5
9Schmidt, Daniel J, West River Rats 1727 W16 D7 W10 L8 W11 3.5
10Gerdes, Isaac, Truelsons and Friends 1708 W11 X16 L9 L7 D8 2.5
11Gerdes, Mark A, De's Efforts Team 1306 L10 D8 L7 Z16 L9 1.0 Board 3
Player Rating Rd 1 Rd 2 Rd 3 Rnd 4 Rd 5 Total
12Truelson, Nicholas, Truelsons and Friends1605 W17 D14 W20 W13 W15 4.5
13Meeter, Alden L, Merchants of Death 1541 D15 W20 W17 L12 W14 3.5
14Wallace, Robert M, Pierre 1712 D20 D12 D8 W17 L13 2.5
15Schmidt, Wesley D, Sioux Falls One 1709 D13 W17 Z16 Z24 L12 2.5
16Bezpaletz, Reuben, Pierre 1731 L9 F10 Z15 Z11 L7 1.0
17Gerdes, Taryn N, De's Efforts Team 1188 L12 L15 L13 L14 L20 0.0
Board 4
Player Rating Rd 1 Rd 2 Rd 3 Rd 4 Rd 5 Total
18Merchant, Dan E, Merchants of Death 1502 W23 W24 D21 W22 W19 4.5
19Rydland, Sigurd A, Pierre 1500 W24 W22 D23 W21 L18 3.5
20Likens, Jill Way, West River Rats 1429 D14 L13 L12 D23 W17 2.0
21Kingsley, Alan G, De's Efforts Team 1166 W22 D23 D18 L19 L24 2.0
22Truelson, Zachary, Truelsons and Friends1138 L21 L19 W24 L18 W23 2.0
23Rostrom, Dick, Sioux Falls One 1501 L18 D21 D19 D20 L22 1.5
24Cass, Larry R, West River Rats 1251 L19 L18 L22 Z15 W21 1.5
SOUTH DAKOTA CLOSED,OACOMA JULY1920,2003
Name Pts Rd1 Rd2 Rd3 Rd4 Rd5 Rd6
1.Truelson, Nels W 5.0 W5 W4 W3 D2 W7 D2
2.Hanson, Lyle A 5.0 W9 W7 W4 D1 W3 D1
3.Likens, Terry Dean3.0 W10 W6 L1 W7 L2
4.Wallace, Robert M3.0 W12 L1 L2 W5 W9
5.Brandt, Bruce E 3.0 L1 W13 W12 L4 W10
6.Truelson, Nicholas3.0 W8 L3 L7 W10 W12
7.Gerdes, Isaac 2.0 W13 L2 W6 L3 L1
8.Carroll, Curtis L 1.5 L6 D9 W13 U U
9.Likens, Jill Way 1.5 L2 D8 L10 W12 L4
10.Rostrom, Dick 1.0 L3 L12 W9 L6 L5
11.Gerdes, Mark A 1.0 U U U W13 U
12.Heidinger, Dan J1.0 L4 W10 L5 L9 L6
13.Truelson, Zachary0.0 L7 L5 L8 L11 U"
ANNOTATED GAMES FROM THE 2OO3 SOUTH DAKOTA
I was not familiar with this gambit, and was unaware of its dangers.
3….. dxe
4. f3 exf
5. Nxf3…
5.Qxf3 is another possibility. 5 .. e6
7. Be3 Bb7
8. 0-0 Nc6
9. Qe2….
Perhaps better was 9. Qe1, with the idea of bringing the queen to h4.
9…. Be7
10. Rad1 0-0 11 .Ne4 Nb4
12. Nxf6+ Bxf6 13. Bc4 a6?
Round 2, 2003 South Dakota State Championshiop
White: Terry Likens
Black: Nick Truelson (Notes by Nick Truelson)
1. d4 Nf6
2. Nc3 d5
3. e4
A rather passive move. More active alternatives include Bf4, Bg5 and g6.
6. Bd3 b6
To stop White from controlling e4.
The pieces must be traded. 13 ..Bd5 forces the exchange of White's best bishop.
14. c3 Nd5
15. Bc1 b5
16. Bb3 c5 17. dxc Qc7
BULLETIN OF THE SOUTH DAKOTA CHESS ASSOCIATION OCTOBER 2003
18. Bc2 Qxc5+ 19. Kh1 Bxc3
I didn't anticipate White's
resourceful 23rd move.
20. bxc3 Nxc3 21. Bxh7+ Kxh7
9.Qe2….
21. Qb5….
22. Qc2 Be4 23. Rd3! Bxd3 24. Qxd3+ g6 25. Ng5+ Kg7 26. Rxf7+! Rxf7 27. Nxe6+ Kh7 28. Nxc5 Re8?
Last chance. Black could have still secured the draw with 28…Rd8! 29. Qh3+, Kg8 30. g3, Rd1+ 31. Kg2, Rxc1.
29. h4 Re1+ 30. Kh2 Rxc1 31. h5 Rf5 32. hxg+ Kxg6 33. g4 Resigns.
Round 4, 2003South Dakota State Championship White: Lyle Hanson Black: Nels Truelson (Notes by Nels Truelson)
1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Nc6 7. 0-0 Be7 8. Nc3
The immediate offer to trade of this knight is more typically made with 8. Nd2. The text does not allow c4 for White, and thus gives Black another option.
8…… f5
Possibly the wrong order. Playing 9. Re1 first would have made Black's next move worthless.
9….. Nb4
10. Bf4 0-0
11. Rfe1 c5!
Just when the tensions appeared to be favoring White, Black seizes the initiative. None of the counter-tactics quite work for White.
12. a3 cxd 13. Nb5 Nc6
14. Nc7?…
White should have settled for 14. Nbxc4, Bc5, after which Black's more active pieces give him a slight edge with the isolani.
14 . G5
15. Nxd5 gxf4
16. Nxf4 Bd6
Other than the pawn, White's only compensation for the piece is Black's characteristic time trouble.
17. Nh3 Qf6 18. Rad1 Bd7
19. Bc4+ Kh8
20. Bd5 Rae8
Admittedly looking pretty desperate, but what else is White to do? Considering the clocks, it was good to stir something up.
21 . Ne5 22. Qxb7 Rb8
Yes, this works too, but if Black were looking for simplicity, 22 .Nxf3+ 23. gxf3, Nc5 followed by 24….f4 simply picked up a second piece.
23. Qxa7 Nxf3+
Again, this should win, but clearly better was to trap White's queen with 23 .Bc5 24. Qa5 (24. Qc7, Rfc8), Rb5 25. Qa4, Rxb2 26. Qa5, Rb5 27. Qa4, Nc3.
24. gxf3 Qe5 25. f4 Rg8+
Unnecessary. 25 ..Qxd5 26. Qxd7, Nc5 27. Qa7, Qg2+, and Black can choose his choice of wins.
26. Bxg8 Rxg8+ 27. Kf1 Qg7??
Very sad. After a relatively well-played game, Black
throws away the win by bypassing the natural move
27….Bb5+ 28. Rd3, Qc5
29. Qxc5, Nxc5, after which
28. Qxd4 Bb5+ 29. c4 Bxc4+ Draw agreed upon.
Probably the natural result. After 30. Qxc4, Qg2+ 31. Ke2, Qxh3 32. Rxd6, Qg4+, it is very complicated, but perpetual checks tend to avail themselves for both sides.
Effective 1 October 2003
1: 2204 TRUELSON,NELS W
2: 2188 Salem,PaulJ
3: 2134 Falk,Mark
4: 2056 KERKHOVE,DAVID E
5: 1969 SORENSON,ARNE C
6: 1913 KNUDSON,MARK D
7: 1900 HANSON,LYLE A
8: 1877 WATHIER,JOHN
9: 1848 HORTON,LOUIS A
10: 1841 BARTH,JEFFREY E
11: 1820 WALLACE,GARY E
12: 1819 CARROLL,CURTIS
13: 1807 LIKENS,TERRY DEAN
14: 1788 SULJIC,SERIF
15: 1774 Overholtzer,Harry A
16: 1754 THELEN,MIKE J
17 1743 KOELLER,RANDALL S
18 1718 SCHMIDT,DANIEL J
19: 1712 HAGGAR,DANIEL K
20: 1711 WALLACE,ROBERT M
21: 1706 BEZPALETZ,REUBEN
22: 1706 DERBY,MARK P
23: 1703 BIER,JOHN J
24: 1700 BRANDT,BRUCE E
25: 1691 SCHMIDT,WESLEY 26: 1687 TRUELSON,NICHOLAS 27: 1686/22 RELJIC,SRDJAN D 28: 1654 SCHAFFER,STEVEN 29: 1646 GERDES,ISAAC 30: 1627 CAHILL,STEVE E 31: 1608 WALDNER,MARTIN 32: 1582 MEETER,ALDEN L 33: 1573 BERGAN,JERRY T 34: 1538 Bergan,Michael J 35: 1537/16 Lehman,Karl J 36: 1534 MERCHANT,DANIEL E
Black still has his work cut out for him, but White is in a bind, and Black's bishops will make quick work of the
37: 1528 PAINTNER,TIMOTHY 38: 1516 BERGAN,JUD J 39: 1514 YOUNG,ALEXANDER 40: 1500 ROSTROM,DICK 41: 1497 RYDLAND,SIGURD 42: 1492 LOOYENGA,PAUL 43: 1442 DAGGITT,RYAN R 44: 1429 BRINK,DARIN 45: 1428 LIKENS,JILL WAY 46: 1400 KIEFFER,CLARENCE 47: 1396/18 SAX,LARRY A 48: 1395 HOFF,JORDAN L 49: 1370 NELSON,MICHAEL T 50: 1332 CLEBERG,THOMAS M
TOP 25 SOUTH DAKOTA
SCHOLASTICS
1: 1687 TRUELSON,NICHOLAS J 2: 1646 GERDES,ISAAC 3: 1582 MEETER,ALDEN L 4: 1514 YOUNG,ALEXANDER C 5: 1370 NELSON,MICHAEL T 6: 1330 SAX,JUDAH J 7: 1311 SAX,TIMOTHY B 8: 1308 PAYTON,ABRAHAM I 9: 1254 HAGGAR,JENNA J 10: 1248 GERDES,JORDAN 11: 1205 YOUNG,ZACHARY 12: 1200 WATERS,JOE G 13: 1180 HOWARD,ANDREW 14: 1166 GERDES,TARYN N 15: 1156 TRUELSON,ZACHARY Y 16: 1141 GLADER,PHILIP S 17: 1131 WATERS,SAM J 18: 1113
ABRAHAMSON,ZACHARY G F 19: 1106 GLADER,ANDREW L 20: 1103 SIOREK,MALGORZATA 21: 1101 KUSHMAN,JAMES R 22: 1080 SD GLADER,RUTH E 24: 1057 SD STEWART,GABE M 25: 1032 SD LIND,JOHN F
SCHEDULE
NOVEMBER1,2003-2004
AmericInn Lodging National Chess Tournament-Local Tournament Location: Americinn Motel,Madison, SD Contact: Wesley D. Schmidt, 2213
extra pawns.
Tricia LaneSioux Falls,SD 57103 Home:(605)339-2248 email:saschmidt@prodigy.net
NOVEMBER 8-Veteran's Day Scholastic, Saturday, November 8, 2003 at Stevens High School. (Renovations at South Dakota School of Mines & Technology mean that the Surbeck is not available this fall). Divisions: K-3; K-5; K-8; K-12. Entry fee: $10 in advance; $15 on the day of the tournament. USCF Membership required. Trophies to top five individuals and top three teams in each division.
JANUARY 31,2004- Black Hills Scholastic, Saturday, January 31, 2004 at the South Dakota School of Mines & Technology (Surbeck Center). Divisions: K-3; K-5; K-8; K-12. Entry fee: $10 in advance; $15 on the day of the tournament. USCF Membership required. Trophies to top five individuals and top three teams in each division. For more information about either of these tournaments, please contact Eric Abrahamson at 605/484-3820 or by return email. Eric Abrahamso, 1422 Clark Street Rapid City, SD 57701 or ric@prologuegroup.com
NOVEMBER 9,2003-2003
AmericInn Lodging National Chess Tournament-Local Tournament Location: Americinn Motel,3508 S.Gateway Blvd.,Sioux Falls, SDContact: Wesley D. Schmidt, 2213 Tricia LaneSioux Falls,SD 57103 Home:(605)339-224 email:saschmidt@prodigy.net
NOVEMBER 22,2003-ALL CITY CHESS FESTIVAL
6 THE BULLETIN OF THE SOUTH DAKOTA CHESS ASSOCIATION OCTOBER 20037 THE BULLETIN OF THE SOUTH DAKOTA CHESS ASSOCIATION OCTOBER 2003
Location: Sioux Falls O’Gorman High School Cafeteria,3201 S. Kiwanis.Sioux Falls, SD Open to all persons 12th grade and under
Rated:Five round SS: Rounds Game-60minutes Round times: 9am, 11am, 1pm, 3pm, 5pm Unrated 5 Round Swiss System pairings Game in 20 minutes 1st round 8:30am and 10 minutes after the completion of each round thereafter
Prizes: Trophies will be awarded to the top 4 individuals in each section.
Trophies will be awarded to the top 2 teams in each section (4/team)
USCF Membership required, except K-3 section. ( available onsite) in rated Sections. Avaiable at siteMake checks payable to Sioux Empire Chess Foundation (SECF).
Entry fee: Rated $10 prior to deadline, $15 after Nov.15 Unrated:$5 prior to deadline $10 after Nov.15 Pre-registration 8am8:30am on Saturday November 22.t.For more information contact Wes Schmidt at:sasschmidt@prodigy.net - Mail this to: Wes Schmidt 2213 Tricia Lane,Sioux Falls, SD 57103
NOVEMBER 23,2003
AmericInn Lodging National Chess Tournament-Local Tournament Location: Americinn Motel,Chamberlain, SDContact: Wesley D. Schmidt, 2213 Tricia LaneSioux Falls,SD 57103 Home:(605)339-2248 email:saschmidt@prodigy.net
SOUTH DAKOTA CHESS ASSOCIATION
C/O WESLEY D. SCHMIDT 2213 E. TRICIA LANE SIOUX FALLS,SD 57103
who live in the Sioux Falls Metro Area Unrated is only open to persons who have never played a USCF rated game
JANUARY 17, 2004
COYOTE CLASSIC CHESS TOURNAMENT
January 17, 2004 in Vermillion, SD at the USD Coyote Student Center (where else)
Visit us online at www.usd.edu/~chess for more info.
Send questions to chess@usd.edu Tournament Format
Open section (rated): Four round SS Game in 60 minutes
Round times: 10:00a, 12:00p, 2:00p, 4:00p
Prize money will be awarded for 1st, 2nd, 3rd, biggest upset, 1st under 1400
Open section (unrated): Four round SS Game in 45 minutes
Round times: 11:00a, 12:30p, 2:00p, 3:30p Awards will be available for 1st, 2nd, 3rd
Youth Reserve Section (Rated) (K-6) Five round SS Game in 45 min.
Round times: 10:00a, 11:30a, 1:00p, 2:30p, 4:00p Individual trophies for 1st, 2nd and 3rd place– (Trophies and medals for the top 2 teams)
Youth Premier Section (Rated) (7-12) Five round SS Game in 45 min.
Sections: K-12(rated), K-9(rated), K-6(rated), K-3(rated) K12(unrated),K-9(unrated),K6(unrated)K-3(unrated)
Round times: 10:00a, 11:30a, 1:00p, 2:30p, 4:00p Individual trophies for 1st, 2nd and 3rd place– (Trophies and medals for the top 2 teams)
SCHOOLS MAY ENTER ANY NUMBER OF PLAYERS; TEAM SCORE WILL BE THE TOTAL OF THE TOP FOUR PLAYERS SCORE.
Entry fee: Open rated: $20. Open unrated: $15. Youth: $12 or $7 for first time USCF members (applications available on site)
Registration: 9:00-9:45 Note: Pre-registration is highly encouraged.Pre-register by Jan. 10
JANUARY 31, 2004 Black Hills Scholastic, Saturday, January 31, 2004 at the South Dakota School of Mines & Technology (Surbeck Center). Divisions: K-3; K-5; K-8; K-12. Entry fee: $10 in advance; $15 on the day of the tournament. USCF Membership required. Trophies to top five individuals and top three teams in each division. For more information, contact Eric Abrahamson – 605/484-3820 or eric@prologuegroup.com
THE BULLETIN OF THE SOUTH DAKOTA CHESS ASSOCIATION OCTOBER 2003
SOUTH DAKOTA CHESS ASSOCIATION BULLETIN is the official newsletter of the South Dakota Chess Association. The South Dakota Chess Association has tax-exempt status as a 501(c)(4) organization under Section 501(a) of the Internal Revenue Code. Contributions to the South Dakota Chess Association are not tax-deductible for Federal Income tax purposes. Direct your comments regarding the SDCA to Wesley D.Schmidt. Direct your comments regarding the bulletin to Wesley D.Schmidt.Direct your comments regarding the SDCA web page to Dan Merchant at dan@mjts.com
Subscriptions should be sent to Dan Merchant -- Adults-- $10 Junior-$6 Family-$15 All subscription expire on December 31.
PRESIDENT:WESLEY D SCHMIDT VICE PRESIDENT: NELS TRUELSON 2213 E.TRICIA LAND 3108 E.MARSON DR. RENNER,SD S IOUX FALLS,SD 57103 NMG8860@aol.com NTruelson@aol.com
SEC-TREAS: DAN MERCHANT EDITOR:WESLEY D. Schmidt 2204 DERDALL DRIVE 2213 TRICIA LANE BROOKINGS,SD 57006 SIOUX FALLS,S57103 dans@rmjts.com saschmidt@prodigy.net
WEBMASTER:DAN MERCHANT DISTRICT COORDINATORS: 2204 DERDALL DRIVE TERRY DEAN LIKES, DE KNUDSON BROOKINGS, SD 57006 CURTIS CARROLL dan@mjts.com
WEBSITE: http://www.sdchess.org