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Go ranks and ratings

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516:(abbreviated online as "d") ranks are for advanced amateur players. Although many organisations let players choose their own kyu rank to a certain extent, dan ranks are often regulated. This means that players will have to show good results in tournaments or pass exams to be awarded a dan rank. Serious students of the game will often strive to attain a dan rank, much as martial arts practitioners will strive to achieve a black belt. For amateurs, dan ranks up to 7th dan are available. Above this level, a player must become a 36: 2785: 1312:
to 40 in chess, so there are more opportunities for a weaker player to make sub-optimal moves. The ability to transform a small advantage into a win increases with playing strength. Due to this ability, stronger players are more consistent in their results against weaker players and will generally score a higher percentage of wins against opponents at the same rank distance.
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standard deviation of 104, i.e. slightly more than one rank, while the European Go Federation ratings have a sliding standard of deviation from 200 for beginners down to 70 for top players. The IGS has a fixed standard deviation for all levels of play, but a non-standard distribution. The following table displays some of the differences:
1124:(from above). However, there is a slight inflationary mechanism built into the ratings adjustment after each game to compensate for the fact that newcomers usually bring fewer ELO points into the pool than they take out with them when they cease active play. Other Elo-flavor ratings such as the AGA, IGS, and DGS systems use 1311:
While in chess a player must take some risks to avoid a draw, in Go draws (jigo) are either impossible (with superko and non-integer komi, such as 6.5 points, as is common) or less likely in the case of integer komi. Also, an average game of Go lasts for 240 moves (120 moves in chess terms), compared
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The professional dan ranking system is similar to that of amateurs in that it awards dan ranks that increase numerically with skill. The difference between these grades is much smaller than with amateurs however, and is not based on the number of handicap stones required. Professional dan ranks go up
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Player pools that do not regularly mix (such as different countries, or sub-groups on online servers) often result in divergent playing strengths compared to the same nominal rank level of other groups. Players asked to give their rank will therefore often qualify it with "in my country" or "on this
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A variation of the Elo rating system called WHR ('Whole History Rating'), differs from standard Elo in that it retroactively re-rates players based on their entire history after each new result is added, rather than incrementally changing a player's rating on a game-by-game basis. This involves more
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rank as an honorary title for exceptional achievement. In the United States, amateur dan ranks are often based on the AGA rating system. Under this system, some strong amateurs and former professional players have achieved up to 9th dan amateur, though generally they will register as 6th or 7th dan
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The rating indirectly represents the probability of winning an even game against other rated players. This probability depends only on the difference between the two players' ratings, but its magnitude varies greatly from one implementation to another. The American Go Association adopted a uniform
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In a small club, ranks may be decided informally and adjusted manually when players consistently win or lose. In larger clubs or country wide rating systems, a mathematical ranking system is generally easier to maintain. Players can then be promoted or demoted based on their strength as calculated
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Although players who have achieved professional dan ranks are nominally stronger than amateur dan players, in practice some of the strongest 7th dan amateur players have a playing level on par with that of some professional players. Such players have either never tried for a professional rank, or
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ranks. Beginners who have just learned the rules of the game are usually around 30th kyu. As they progress, they advance numerically downwards through the kyu grades. The best kyu grade attainable is therefore 1st kyu. If players progress beyond 1st kyu, they will receive the rank of 1st dan, and
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Differences in strength up to amateur dan level generally correspond to the level of handicap that would yield an even game between the two players. For instance, it is expected that a 3d player could give 2 handicap stones to a 1d player and win half of their games. In contrast, differences in
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professional ranks are much smaller, perhaps 1/4 to 1/3 of a handicap stone. There are some significant differences in strength between ordinary 9p players and the best players in the world because 9p is the highest rank possible, which may account for this variation.
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is varied depending on the rating of the players, because of the low confidence in (lower) amateur ratings (high fluctuation in the outcome) but high confidence in pro ratings (stable, consistent play). K is 116 at rating 100 and 10 at rating 2700
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Most Go playing servers use a mathematical rating system to keep track of the playing strength of their members. Such ratings may or may not be translated to kyu and dan ranks for the convenience of the players.
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Although almost all organizations use this system, there is no universal calibration. The methods of awarding each of those ranks and the corresponding levels of strength vary from country to country and among
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attempts to establish rough correspondence between ratings and kyu/dan ranks. This is done by varying some of the components of the Elo formula to achieve a close match to the adjacent table. The probability
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color. With the ready availability of calculators and computers, rating systems have been introduced. In such systems, a rating is rigorously calculated on the basis of game results.
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intense computation than other methods, but is claimed that "in comparison to Elo, Glicko, TrueSkill, and decayed-history algorithms, WHR produces better predictions.". The website
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rating systems. Rating systems generally predict the probability that one player will defeat another player and use this prediction to rank a player's strength.
299:, with a difference of one rank roughly corresponding to one free move at the beginning of the game. This system is also commonly used in many East Asian 1128:
to adjust ratings, so those systems are anchored by prior distributions rather than by attempting to ensure that the gain/loss of ratings is zero sum.
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In the EGF system, the Elo points won by the winner almost equal the ones lost by the loser and the maximum points movement is the constant
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to 9th dan, but the strength difference between a 1st dan and a 9th dan professional is generally no more than 2–3 handicap stones.
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in international events. Similarly, some players have achieved 9th dan amateur ranks in the rating system of online Go servers.
505:. It is thought that the fact that there are 9 professional dan grades finds its base in the original 9 Chinese Pin Zhi grades. 259: 1538: 456:. This means that a player who is considered to be a 2nd kyu in one country, may only be considered a 5th kyu in another. 2286: 1618: 1568: 1157: 204: 2710: 1578: 794: 252: 448:(There is also an amateur title of 8-dan and a professional title of 10-dan, but these are not the same as ranks.) 1381: 1153:. Most clubs and countries maintain their own ratings, as do Go playing servers. Go tournaments in Europe use the 2663: 2281: 2344: 788:) that the player with the lower rating, player A, wins against a higher rated player B is given by the formula 2740: 997: 2815: 1125: 1328: 2334: 926: 1784: 2705: 2650: 2726: 2416: 2628: 2610: 2229: 337: 60: 2319: 2695: 2633: 2597: 2314: 2222: 1754: 873: 529:
have chosen to remain amateur players because they do not want to make a career out of playing Go.
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The ratings of players are generally measured using the game results of Go competitions and
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to achieve further promotions. In Japan and China, some players are awarded an amateur 8th
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for players based on the results of their games. Commonly used rating systems include the
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refers to the standard deviation used to calculate winning expectancies as px_sigma.
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With the invention of calculators and computers, it has become easy to calculate a
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from then on will move numerically upwards through the dan ranks. In martial arts,
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implies a distribution function which is not a bell curve, but a "pointy hat".
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formalised the teaching and ranking of Go. The system was later used in
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ranks, the former is often abbreviated to "p" (sometimes called
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implements the WHR method to calculate global player rankings.
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The rank system is tabulated from the lowest to highest ranks:
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ranks. Especially in amateur play, these ranks facilitate the
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The first Go ranks were given in 2nd century (CE) China, when
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Traditionally, the level of players has been defined using
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Approximate comparison between different ranking systems
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GoGoD (Fairbairn & Hall) (2007), "Honinbo Dosaku",
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schools; and is thought to be derived originally from
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The probability that player B wins is calculated as
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is varied depending on the prior rating of player A.
1055: 980: 903: 855: 2807: 1440: 1408: 1307:Winning chances and handicaps in Go versus chess 1109:is varied depending on the rating of the players 1348: 856:{\displaystyle S_{E}(A)={\frac {1}{e^{D/a}+1}}} 1612: 1404: 1402: 1344: 1342: 260: 991:The new rating of a player is calculated as 582: 16:Ranks and rating systems used by the game Go 1619: 1605: 1399: 1339: 283:that measure the skill in the traditional 267: 253: 34: 1379: 1375: 1373: 1371: 1052: 977: 900: 1329:"Go ranking and rating system explained" 1179: 1056:{\displaystyle R_{n}=R_{o}+K(S-S_{E})\,} 1315: 1131: 508: 489:(艺经). From the early 17th century, the 2808: 1368: 1199:Winning % of the stronger player 340:. The very best players may achieve a 1600: 1436: 1434: 1321: 981:{\displaystyle S_{E}(B)=1-S_{E}(A)\,} 532: 1417: 665:7 dan amateur or 1 dan professional 547:To distinguish between professional 310: 303:, where it often corresponds with a 13: 2711:Taiwan Chi Yuan Culture Foundation 1480: 1431: 14: 2827: 1559: 562: 483:(九品制) ranking system in his book 2783: 327:ranks. Dan ranks are considered 323:ranks. Kyu ranks are considered 2664:All Japan Student Go Federation 1530: 1511: 2741:Games played with Go equipment 1581:by the American GO Association 1499: 1474: 1449: 1144: 1049: 1030: 974: 968: 946: 940: 814: 808: 1: 1575:by the European Go Federation 1506:Inside the AGA Ratings System 1443:"EGF Official ratings system" 1126:maximum likelihood estimation 904:{\displaystyle R_{B}-R_{A}\,} 279:There are various systems of 1168:from their wins and losses. 777:European Go Federation (EGF) 7: 2706:Singapore Weiqi Association 2651:International Go Federation 1537:Official European Ratings. 1411:"Rank Worldwide Comparison" 1351:"Classifiactie van spelers" 10: 2832: 2418:Long Ode to Watching Weiqi 1539:"Statistics on Even Games" 1426:Articles on Famous Players 870:is the rating difference: 536: 2778: 2719: 2629:Chinese Weiqi Association 2611:Australian Go Association 2596: 2474: 2353: 2295: 2238: 2147: 2009: 1731: 1666: 1636: 1566:Official European Ratings 1198: 1195: 1190: 583:Elo ratings as used in Go 463: 213:Computers and mathematics 165:Players and organizations 2696:Mind Sports Organisation 2634:Hong Kong Go Association 2345:Lee's broken ladder game 2223:Nihon Ki-in Hall of Fame 241:AlphaGo versus Lee Sedol 2684:Korea Baduk Association 2646:French Federation of Go 2606:American Go Association 2561:Monte Carlo tree search 2335:The Game of the Century 336:is the equivalent of a 109:(corner-based openings) 2701:New Zealand Go Society 2641:European Go Federation 2616:British Go Association 2376:The Girl Who Played Go 2230:Professional handicaps 1626: 1579:AGA Rating Information 1441:European Go Database. 1057: 982: 905: 857: 779:implementation of the 101:(whole-board openings) 2315:AlphaGo vs. Lee Sedol 1518:The IGS Rating System 1349:Nederlandse Go Bond. 1180:Winning probabilities 1092:= score (1, 0.5 or 0) 1058: 983: 906: 858: 412:Intermediate amateur 342:professional dan rank 2816:Go ranks and ratings 2656:Irish Go Association 2458:The Surrounding Game 2011:Strategy and tactics 1316:Notes and references 1155:EGF Official ratings 1132:Other rating systems 998: 927: 874: 795: 509:Achieving a dan rank 442:Professional player 281:Go ranks and ratings 78:Strategy and tactics 2556:Future of Go Summit 2484:Computer Go UEC Cup 2325:Blood-vomiting game 2305:AlphaGo vs. Fan Hui 1587:at Sensei's Library 1335:. 28 February 2019. 657:2 dan professional 649:3 dan professional 641:4 dan professional 633:5 dan professional 625:6 dan professional 617:7 dan professional 609:8 dan professional 601:9 dan professional 518:professional player 406:(abbreviated: SDK) 391:(abbreviated: DDK) 297:handicapping system 236:Internet Go servers 129:History and culture 22:Part of a series on 2746:Go and mathematics 2727:Benson's algorithm 2689:Myongji University 2330:Ear-reddening game 2310:AlphaGo vs. Ke Jie 2165:Dunhuang Go Manual 1571:2008-02-20 at the 1523:2007-08-25 at the 1461:www.remi-coulom.fr 1409:Sensei's Library. 1176:Internet server". 1160:2017-12-26 at the 1053: 978: 901: 853: 533:Professional ranks 221:Go and mathematics 2803: 2802: 2566:Smart Game Format 2297:Games and matches 2251:Ranks and ratings 1304: 1303: 851: 781:Elo rating system 773: 772: 454:online Go servers 446: 445: 427:Advanced amateur 311:Kyu and dan ranks 277: 276: 190:Ranks and ratings 2823: 2788: 2787: 2445:Sensei's Library 2432:The Master of Go 2340:Kamakura jubango 2320:Atomic bomb game 2213:European players 1621: 1614: 1607: 1598: 1597: 1554: 1553: 1551: 1550: 1541:. Archived from 1534: 1528: 1515: 1509: 1503: 1497: 1496: 1494: 1492: 1487: 1478: 1472: 1471: 1469: 1467: 1453: 1447: 1446: 1438: 1429: 1428: 1421: 1415: 1414: 1406: 1397: 1396: 1394: 1393: 1384:. Archived from 1377: 1366: 1365: 1363: 1362: 1353:. Archived from 1346: 1337: 1336: 1325: 1188: 1187: 1103:= expected score 1062: 1060: 1059: 1054: 1048: 1047: 1023: 1022: 1010: 1009: 987: 985: 984: 979: 967: 966: 939: 938: 910: 908: 907: 902: 899: 898: 886: 885: 862: 860: 859: 854: 852: 850: 843: 842: 838: 821: 807: 806: 673:6 dan (amateur) 587: 586: 479:) described the 350: 349: 269: 262: 255: 38: 19: 18: 2831: 2830: 2826: 2825: 2824: 2822: 2821: 2820: 2806: 2805: 2804: 2799: 2782: 2774: 2715: 2592: 2470: 2465:The Weiqi Devil 2369:The Divine Move 2349: 2291: 2270:Honorary titles 2246:Go professional 2234: 2196:Oskar Korschelt 2158:Classic of Arts 2143: 2005: 1755:Board positions 1727: 1662: 1632: 1625: 1573:Wayback Machine 1562: 1557: 1548: 1546: 1535: 1531: 1525:Wayback Machine 1516: 1512: 1504: 1500: 1490: 1488: 1485: 1479: 1475: 1465: 1463: 1455: 1454: 1450: 1439: 1432: 1422: 1418: 1407: 1400: 1391: 1389: 1380:David Mechner. 1378: 1369: 1360: 1358: 1347: 1340: 1327: 1326: 1322: 1318: 1309: 1192: 1182: 1162:Wayback Machine 1147: 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1372: 1357:on 2013-09-10 1356: 1352: 1345: 1343: 1334: 1330: 1324: 1320: 1313: 1299: 1296: 1293: 1290: 1287: 1284: 1281: 1278: 1277: 1273: 1270: 1267: 1264: 1261: 1258: 1255: 1252: 1251: 1247: 1244: 1241: 1238: 1235: 1232: 1229: 1226: 1225: 1221: 1218: 1215: 1212: 1209: 1206: 1203: 1202: 1193:organisation 1189: 1186: 1177: 1173: 1169: 1165: 1163: 1159: 1156: 1152: 1142: 1140: 1129: 1127: 1123: 1118: 1115: 1108: 1105: 1101: 1097: 1094: 1091: 1088: 1084: 1080: 1077: 1073: 1069: 1066: 1065: 1044: 1040: 1036: 1033: 1027: 1024: 1019: 1015: 1011: 1006: 1002: 994: 993: 992: 971: 963: 959: 955: 952: 949: 943: 935: 931: 923: 922: 921: 915: 912: 895: 891: 887: 882: 878: 869: 866: 865: 847: 844: 839: 835: 831: 827: 822: 817: 811: 803: 799: 791: 790: 789: 782: 778: 768: 765: 764: 760: 757: 756: 752: 749: 748: 744: 741: 740: 736: 733: 732: 728: 725: 724: 720: 717: 716: 712: 709: 708: 704: 701: 700: 696: 693: 692: 688: 685: 684: 680: 677: 676: 672: 669: 668: 664: 661: 660: 656: 653: 652: 648: 645: 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81: 79: 76: 74: 73:List of terms 71: 69: 66: 62: 59: 58: 57: 54: 52: 49: 48: 47: 46: 42: 41: 37: 33: 32: 29: 26: 25: 21: 20: 2756: 2733: 2669:Kansai Ki-in 2624:China Qiyuan 2504:AlphaGo Zero 2464: 2457: 2450: 2438: 2431: 2423: 2417: 2410: 2404:Hikaru no Go 2403: 2396: 2389: 2382: 2375: 2368: 2361: 2275: 2261: 2250: 2201: 2164: 2157: 2137: 2130: 2121: 2078: 2069: 2062: 2055: 2041: 2024: 1999: 1987: 1982:Shoulder hit 1970: 1963: 1956: 1934: 1927: 1920: 1913: 1906: 1894: 1877: 1870: 1863: 1856: 1849: 1842: 1835: 1828: 1821: 1814: 1807: 1800: 1793: 1789: 1785: 1773: 1760: 1748: 1741: 1719: 1695: 1688: 1681: 1651: 1627: 1547:. 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Retrieved 1355:the original 1332: 1323: 1310: 1183: 1174: 1170: 1166: 1148: 1135: 1121: 1119: 1113: 1112: 1106: 1099: 1095: 1089: 1086:= old rating 1082: 1078: 1075:= new rating 1071: 1067: 990: 919: 913: 867: 774: 568: 566: 556: 552: 551:and amateur 548: 546: 542: 527: 521: 513: 512: 495:martial arts 484: 467: 458: 450: 447: 433: 418: 403: 388: 369: 365: 346: 341: 328: 324: 320: 316: 314: 301:martial arts 280: 278: 205:Competitions 189: 122:(Go puzzles) 117: 104: 96: 61:professional 2674:Nihon Ki-in 2514:Crazy Stone 2287:Tournaments 2239:Competition 2171:Emperor Yao 1901:Monkey jump 1871:Korigatachi 1767:Divine move 1151:tournaments 1145:Rating base 499:court ranks 470:Handan Chun 231:Go software 226:Computer Go 2763:Capture go 2544:Leela Zero 2519:Darkforest 2425:The MANIAC 2042:Shinfuseki 1591:Go Ratings 1549:2007-10-18 1392:2007-12-14 1382:"Go ranks" 1361:2008-03-28 1222:2d vs. 2k 1219:1d vs. 2k 1216:1k vs. 2k 1139:Go Ratings 590:Elo Rating 472:(Chinese: 353:Rank Type 338:black belt 2509:AlphaZero 2476:Computers 2191:9 Pin Zhi 2181:Four arts 2096:Mirror Go 2036:Kobayashi 1994:Thickness 1709:Clamshell 1668:Equipment 1646:Handicaps 1037:− 956:− 888:− 481:9 Pin Zhi 382:Beginner 142:Equipment 56:Handicaps 2810:Category 2795:Category 2751:Variants 2581:Pandanet 2524:Fine Art 2397:Go World 2202:Oshirogo 2106:Proverbs 1638:Overview 1569:Archived 1521:Archived 1158:Archived 593:Go rank 491:Japanese 417:Amateur 178:European 147:Variants 91:strategy 68:Proverbs 2571:Servers 2494:AlphaGo 2489:Engines 2451:Shibumi 2362:AlphaGo 2276:Jubango 2208:Players 2186:Hoensha 2149:History 2138:Tsumego 2122:Ponnuki 2048:Shusaku 2031:Chinese 1935:Myoushu 1914:Myoushu 1889:Liberty 1850:Kikashi 1772:Double 1689:Katsura 1593:website 1466:4 April 1333:Sentego 1196:Rating 769:20 kyu 761:16 kyu 753:11 kyu 394:19–10k 379:30–20k 368:(級,급) ( 334:1st dan 325:student 173:Players 137:History 119:Tsumego 83:Opening 2680:Korea 2660:Japan 2620:China 2534:KataGo 2529:GNU Go 2131:Tenuki 2086:Ladder 2070:Taisha 2063:Nadare 2056:Jōseki 2025:Fuseki 1988:Tesuji 1957:Sabaki 1946:Pincer 1921:Nakade 1884:Ladder 1878:Kosumi 1829:Kakari 1822:Joseki 1808:Hayago 1794:tenuki 1704:Stones 1300:91.1% 1297:84.2% 1294:71.9% 1274:93.9% 1271:86.0% 1268:71.3% 1248:99.8% 1245:97.3% 1242:83.2% 1213:2 dan 1210:1 dan 1207:1 kyu 1204:2 kyu 1191:Rating 745:6 kyu 737:3 kyu 729:2 kyu 721:1 kyu 713:1 dan 705:2 dan 697:3 dan 689:4 dan 681:5 dan 577:Glicko 569:rating 464:Origin 436:(段,단) 421:(段,단) 374:Korean 359:Stage 356:Range 329:master 183:Female 106:Jōseki 98:Fuseki 87:theory 2757:Batoo 2720:Other 2586:Tygem 2539:Leela 2439:Ranka 2111:Shape 2081:fight 1977:Shape 1971:Sente 1951:Probe 1928:Nerai 1836:Keima 1790:sente 1749:Atari 1733:Terms 1720:Yunzi 1714:Slate 1682:Goban 1676:Bowls 1658:Rules 1491:6 May 1486:(PDF) 1265:2200 1262:2100 1259:2000 1256:1900 1233:−150 1230:−250 503:China 439:1–9p 424:1–7d 409:9–1k 51:Rules 2768:Sygo 2734:kifu 2000:Yose 1964:Seki 1941:Peep 1907:Moyo 1895:Miai 1864:Komi 1843:Kiai 1815:Jigo 1801:Hane 1792:and 1786:Gote 1780:Eyes 1774:hane 1761:Dame 1696:Kaya 1652:Komi 1493:2023 1468:2018 1279:IGS 1253:EGF 1239:250 1236:150 1227:AGA 775:The 750:1000 742:1500 734:1800 726:1900 718:2000 710:2100 702:2200 694:2300 686:2400 678:2500 670:2600 662:2700 654:2730 646:2760 638:2790 630:2820 622:2850 614:2880 606:2910 598:2940 575:and 557:ping 370:geup 319:and 305:belt 291:and 2549:Zen 2262:Kyū 2256:Dan 1742:Aji 1291:33 1288:32 1285:31 1282:30 766:100 758:500 573:Elo 553:dan 549:dan 522:dan 514:Dan 501:in 434:dan 419:dan 404:kyu 389:kyu 372:in 366:kyu 321:dan 317:kyu 293:kyu 289:dan 2812:: 2079:Ko 1857:Ko 1788:, 1629:Go 1459:. 1433:^ 1401:^ 1370:^ 1341:^ 1331:. 1164:. 784:(S 474:邯郸 376:) 344:. 89:; 28:Go 2736:) 1620:e 1613:t 1606:v 1552:. 1495:. 1470:. 1445:. 1413:. 1395:. 1364:. 1122:K 1114:K 1107:K 1100:E 1096:S 1090:S 1083:o 1079:R 1072:n 1068:R 1050:) 1045:E 1041:S 1034:S 1031:( 1028:K 1025:+ 1020:o 1016:R 1012:= 1007:n 1003:R 975:) 972:A 969:( 964:E 960:S 953:1 950:= 947:) 944:B 941:( 936:E 932:S 914:a 896:A 892:R 883:B 879:R 868:D 848:1 845:+ 840:a 836:/ 832:D 828:e 823:1 818:= 815:) 812:A 809:( 804:E 800:S 786:E 477:淳 268:e 261:t 254:v 93:) 85:(

Index

Go

Rules
Handicaps
professional
Proverbs
List of terms
Strategy and tactics
Opening
theory
strategy
Fuseki
Jōseki
Life and death
Tsumego
History
Equipment
Variants
Four go houses
List of games
Players
European
Female
Ranks and ratings
Professionals
Organizations
Competitions
Go and mathematics
Computer Go
Go software

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