This post is a follow-up to EGD Go Rating win/loss lookup table.
Winning against an opponent of the same rating gains more rating points (GoR) than losing to that opponent loses. This is by design to avoid deflation. However, this can also be used to artificially increase one’s rating.
The two tables below answer the question: “How does the rating change if, starting from a certain GoR, one plays a series of games against someone of equal rating, alternately winning and losing?” The columns show the results after 10, 20, 50 and 100 games. The first table is for the situation where all games are played in a single tournament, so the starting GoR is always the same. The second table is for the situation where each game is played in its own “tournament”, so the starting GoR is updated after each game.
The values are for class A tournaments without handicaps.
This is hypothetical, of course, and probably wouldn’t be allowed in the EGD. However, a series of ten-game matches (十番碁, “juubango”) would not be that unusual. Go Seigen played a series of such matches, and in 2014 Lee Sedol played such a match against Gu Li.
Table 1: All games are played in one tournament. Therefore, the starting GoR is the same for each game.
| GoR | 10 games | 20 games | 50 games | 100 games |
|---|---|---|---|---|
| 1000 | 1032.5 | 1097.5 | 1260.0 | 1585.0 |
| 1050 | 1081.3 | 1143.8 | 1300.0 | 1612.5 |
| 1100 | 1130.0 | 1190.0 | 1340.0 | 1640.0 |
| 1150 | 1178.8 | 1236.3 | 1380.0 | 1667.5 |
| 1200 | 1227.5 | 1282.5 | 1420.0 | 1695.0 |
| 1250 | 1276.3 | 1328.8 | 1460.0 | 1722.5 |
| 1300 | 1325.0 | 1375.0 | 1500.0 | 1750.0 |
| 1350 | 1373.8 | 1421.3 | 1540.0 | 1777.5 |
| 1400 | 1422.5 | 1467.5 | 1580.0 | 1805.0 |
| 1450 | 1471.3 | 1513.8 | 1620.0 | 1832.5 |
| 1500 | 1520.0 | 1560.0 | 1660.0 | 1860.0 |
| 1550 | 1568.8 | 1606.3 | 1700.0 | 1887.5 |
| 1600 | 1617.5 | 1652.5 | 1740.0 | 1915.0 |
| 1650 | 1666.3 | 1698.8 | 1780.0 | 1942.5 |
| 1700 | 1715.0 | 1745.0 | 1820.0 | 1970.0 |
| 1750 | 1763.8 | 1791.3 | 1860.0 | 1997.5 |
| 1800 | 1812.5 | 1837.5 | 1900.0 | 2025.1 |
| 1850 | 1861.3 | 1883.8 | 1940.1 | 2052.6 |
| 1900 | 1910.0 | 1930.0 | 1980.1 | 2080.2 |
| 1950 | 1958.8 | 1976.3 | 2020.2 | 2108.0 |
| 2000 | 2007.5 | 2022.6 | 2060.4 | 2135.8 |
| 2050 | 2056.3 | 2069.0 | 2100.7 | 2164.0 |
| 2100 | 2105.2 | 2115.5 | 2141.3 | 2192.8 |
| 2150 | 2154.0 | 2162.1 | 2182.3 | 2222.6 |
| 2200 | 2203.0 | 2209.0 | 2224.0 | 2254.1 |
| 2250 | 2252.1 | 2256.3 | 2266.9 | 2287.9 |
| 2300 | 2301.4 | 2304.2 | 2311.1 | 2325.0 |
| 2350 | 2350.9 | 2352.6 | 2356.9 | 2365.4 |
| 2400 | 2400.5 | 2401.5 | 2404.0 | 2409.1 |
| 2450 | 2450.3 | 2450.9 | 2452.3 | 2455.1 |
| 2500 | 2500.2 | 2500.5 | 2501.3 | 2502.8 |
| 2550 | 2550.1 | 2550.3 | 2550.7 | 2551.5 |
| 2600 | 2600.0 | 2600.1 | 2600.4 | 2600.8 |
| 2650 | 2650.0 | 2650.1 | 2650.2 | 2650.5 |
| 2700 | 2700.0 | 2700.0 | 2700.1 | 2700.2 |
Table 2: Each game is played in a separate “tournament”. Therefore, the starting GoR is updated after each game.
| GoR | 10 games | 20 games | 50 games | 100 games |
|---|---|---|---|---|
| 1000 | 1034.2 | 1099.9 | 1249.4 | 1494.4 |
| 1050 | 1082.9 | 1146.0 | 1289.7 | 1525.2 |
| 1100 | 1131.5 | 1192.1 | 1330.0 | 1556.1 |
| 1150 | 1180.2 | 1238.2 | 1370.3 | 1587.0 |
| 1200 | 1228.9 | 1284.3 | 1410.6 | 1617.9 |
| 1250 | 1277.5 | 1330.5 | 1451.0 | 1648.8 |
| 1300 | 1326.2 | 1376.6 | 1491.3 | 1679.8 |
| 1350 | 1374.9 | 1422.7 | 1531.7 | 1710.7 |
| 1400 | 1423.6 | 1468.9 | 1572.1 | 1741.7 |
| 1450 | 1472.3 | 1515.0 | 1612.5 | 1772.8 |
| 1500 | 1520.9 | 1561.2 | 1653.0 | 1803.8 |
| 1550 | 1569.6 | 1607.4 | 1693.4 | 1834.9 |
| 1600 | 1618.3 | 1653.5 | 1733.9 | 1866.0 |
| 1650 | 1667.0 | 1699.7 | 1774.3 | 1897.2 |
| 1700 | 1715.7 | 1745.9 | 1814.8 | 1928.4 |
| 1750 | 1764.4 | 1792.1 | 1855.4 | 1959.6 |
| 1800 | 1813.1 | 1838.3 | 1895.9 | 1990.9 |
| 1850 | 1861.8 | 1884.6 | 1936.5 | 2022.3 |
| 1900 | 1910.5 | 1930.8 | 1977.1 | 2053.8 |
| 1950 | 1959.3 | 1977.1 | 2017.8 | 2085.4 |
| 2000 | 2008.0 | 2023.4 | 2058.6 | 2117.4 |
| 2050 | 2056.7 | 2069.8 | 2099.6 | 2149.7 |
| 2100 | 2105.5 | 2116.2 | 2140.9 | 2182.6 |
| 2150 | 2154.4 | 2162.9 | 2182.6 | 2216.4 |
| 2200 | 2203.3 | 2209.8 | 2225.0 | 2251.5 |
| 2250 | 2252.4 | 2257.2 | 2268.3 | 2288.3 |
| 2300 | 2301.7 | 2305.0 | 2312.9 | 2327.4 |
| 2350 | 2351.1 | 2353.4 | 2358.8 | 2369.1 |
| 2400 | 2400.8 | 2402.3 | 2406.0 | 2413.1 |
| 2450 | 2450.5 | 2451.5 | 2454.1 | 2459.0 |
| 2500 | 2500.4 | 2501.1 | 2502.9 | 2506.4 |
| 2550 | 2550.3 | 2550.8 | 2552.1 | 2554.7 |
| 2600 | 2600.2 | 2600.6 | 2601.6 | 2603.6 |
| 2650 | 2650.2 | 2650.5 | 2651.3 | 2652.8 |
| 2700 | 2700.1 | 2700.4 | 2701.0 | 2702.2 |