PLAYER PAGE
Corne Jonker
1130131410Sedibeng (GSV)Personal
Main rating
| Rating | 1357.4 |
| K-factor | 36 |
| Floor | 857.4 |
| Highest | 1359.9 (2026-01-01) |
| Min/Max +/- allowed | 132 |
| Rating Change () | |
| Games | 5 |
| Score | 2 |
| We | 2.9 |
| SWe | -0.75 |
| Temp +/- | -27 |
| Penalties | 0 |
| Weight perform | 1299.5 |
| Final +/- | -27 |
| New Rating () | |
| Rating | 1330.4 |
| K-factor | 36 |
| Floor | 857.4 |
| Highest | 1359.9 (2026-01-01) |
| Min/Max +/- allowed | 132 |
Standard rating
| Rating | 1368.3 |
| K-factor | 36 |
| Floor | 868.3 |
| Highest | 1368.3 (2026-01-01) |
| Min/Max +/- allowed | 130.5 |
| Rating Change () | |
| Games | 5 |
| Score | 2 |
| We | 2.93 |
| SWe | -0.93 |
| Temp +/- | -33.4 |
| Penalties | 0 |
| Weight perform | 1299.5 |
| Final +/- | -33.4 |
| New Rating () | |
| Rating | 1334.8 |
| K-factor | 36 |
| Floor | 868.3 |
| Highest | 1368.3 (2026-01-01) |
| Min/Max +/- allowed | 130.5 |
Rapid rating
| Rating | 1164.8 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1164.8 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
Blitz rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
Rating Graph
Tournaments
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | Chess-in-the-Vaal Open 18 April 2026 (E) | Standard | 2026-04-18 | 2026-04-18 | Sedibeng (GSV) | 5 | 1357.4 | 5 | 2 | 1210.2 | -27 | Details |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | Gauteng Inter-Region at Emerald Resort 2025 (U14 Candidates) | Standard | 2025-12-06 | 2025-12-07 | Sedibeng (GSV) | 5 | 1318.8 | 5 | 4 | 1521.7 | 21.8 | Details |
| 2 | Laerskool Eligwa Open 20 Sept 2025 (D) | Standard | 2025-09-20 | 2025-09-20 | Sedibeng (GSV) | 5 | 1296.7 | 5 | 3 | 1415.5 | 12.3 | Details |
| 3 | Eureka Chess Open 26 July 2025 (F) | Standard | 2025-07-26 | 2025-07-26 | Sedibeng (GSV) | 5 | 1308.8 | 5 | 2 | 1247.4 | -6.6 | Details |
| 4 | HS Driehoek Chess Open 2025 (D) | Standard | 2025-06-14 | 2025-06-14 | Sedibeng (GSV) | 5 | 1284.2 | 5 | 3 | 1417.5 | 13.6 | Details |
| 5 | Hoerskool Drie Riviere Open 08 March 2025 (D) | Standard | 2025-03-08 | 2025-03-08 | Sedibeng (GSV) | 5 | 1267.9 | 5 | 3 | 1353.6 | 9.1 | Details |
| 6 | Gauteng Inter-Region at UJ 2024 (U12 Open) | Standard | 2024-12-07 | 2024-12-08 | Johannesburg Metro (GJM) | 5 | 1312.4 | 5 | 0 | 1017.4 | -31.9 | Details |
| 7 | Queens Gambit Chess Open 2024 (D) | Standard | 2024-11-23 | 2024-11-23 | Sedibeng (GSV) | 5 | 1312.7 | 5 | 2 | 1304.7 | -0.2 | Details |
| 8 | Fonteine Open 2024 (D) | Standard | 2024-10-19 | 2024-10-19 | Sedibeng (GSV) | 5 | 1329.7 | 5 | 2.5 | 1225.3 | -9.5 | Details |
| 9 | Sedibeng West District Schools Chess Team's Championships 2024 (U11) | Standard | 2024-08-12 | 2024-08-12 | Sedibeng (GSV) | 5 | 1293 | 4 | 3 | 1424.4 | 10.3 | Details |
| 10 | Eureka Open 27 July 2024 (G) | Standard | 2024-07-27 | 2024-07-27 | Sedibeng (GSV) | 5 | 1258.8 | 5 | 3 | 1380.7 | 12.6 | Details |
| 11 | Midvaal Winter Classic 13 July 2024 (E) | Rapid | 2024-07-13 | 2024-07-13 | Sedibeng (GSV) | 7 | 1258.8 | 7 | 3.5 | 1319.9 | 6.4 | Details |
| 12 | Sedibeng Chess Open 11 May 2024 (U11) | Standard | 2024-05-11 | 2024-05-11 | Sedibeng (GSV) | 5 | 1233.1 | 5 | 3.5 | 1372.4 | 14.3 | Details |
| 13 | Valia's Open 2024 (E) | Standard | 2024-03-02 | 2024-03-02 | Sedibeng (GSV) | 5 | 1207.1 | 5 | 3 | 1361 | 14.5 | Details |
| 14 | 2024 Gauteng Inter-Region Chess Championship (U12A) | Standard | 2024-01-13 | 2024-01-14 | Tshwane (GTP) | 5 | 1224.7 | 5 | 1.5 | 1129.7 | -9.8 | Details |
| 15 | Dr Pieter Hangelbroek Rapid 2023 (C) | Rapid | 2023-10-28 | 2023-10-28 | Sedibeng (GSV) | 5 | 1235.9 | 5 | 1.5 | 1156.4 | -6.2 | Details |
| 16 | 2023 Gauteng Top Schools (U11 Mixed) | Standard | 2023-08-18 | 2023-08-18 | West Rand (GWR) | 5 | 1273 | 5 | 1.5 | 1049.9 | -21.1 | Details |
| 17 | 2023 Sedibeng West District Schools Chess Tournament (U9+U11) | Standard | 2023-08-12 | 2023-08-12 | Sedibeng (GSV) | 5 | 1273 | 5 | 3 | 1282.3 | 0.3 | Details |
| 18 | Overvaal Ope Jul 2023 (D) | Standard | 2023-07-22 | 2023-07-22 | Sedibeng (GSV) | 5 | 1302 | 5 | 2 | 1143.7 | -16.1 | Details |
| 19 | VaalPark Primary Open Chess 2023 (C) | Rapid | 2023-06-16 | 2023-06-16 | Sedibeng (GSV) | 5 | 1330 | 5 | 2 | 1157.5 | -15.5 | Details |
| 20 | Valia's Chess Tournament 2023 (D) | Standard | 2023-05-06 | 2023-05-06 | Sedibeng (GSV) | 5 | 1257.8 | 5 | 3 | 1329.6 | 6.3 | Details |
| 21 | Driehoek Open Chess Tournament 2023 (D) | Standard | 2023-05-13 | 2023-05-13 | Sedibeng (GSV) | 5 | 1257.8 | 5 | 4 | 1432.9 | 17.9 | Details |
| 22 | Hoerskool Drie Riviere Open 2023 (D) | Standard | 2023-03-11 | 2023-03-11 | Sedibeng (GSV) | 5 | 1189.1 | 5 | 4 | 1534.9 | 34.4 | Details |
| 23 | Carel`s Chess Open 2022 (D) | Standard | 2022-03-05 | 2022-03-05 | Sedibeng (GSV) | 5 | 1165.5 | 5 | 3 | 1280.1 | 11.9 | Details |
| 24 | Heidelberg Klub Open 2002 (D) | Standard | 2022-02-19 | 2022-02-19 | Sedibeng (GSV) | 5 | 1183.4 | 5 | 2 | 1098.3 | -9 | Details |
| 25 | Hoerskool Drie Riviere 2020 (F) | Standard | 2020-03-07 | 2020-03-07 | Sedibeng (GSV) | 5 | 1161.8 | 5 | 3 | 1264.8 | 10.9 | Details |
| 26 | AG Visser 2020 (D) | Standard | 2020-02-22 | 2020-02-22 | Sedibeng (GSV) | 6 | 1200 | 6 | 2.5 | 1037.1 | -19 | Details |
Game statistics ( )
| Games | 5 |
| Wins | 2 |
| Draws | 0 |
| Losses | 3 |
| White | 3 |
| Black | 2 |
| White wins | 1 |
| Black wins | 1 |
| Score | 2 |
| Percent | 40 |
| Dp | -85 |
| AOR | 1295.2 |
| Performance | 1210.2 |
Game statistics ()
| Games | 5 |
| Wins | 2 |
| Draws | 0 |
| Losses | 3 |
| White | 3 |
| Black | 2 |
| White wins | 1 |
| Black wins | 1 |
| Score | 2 |
| Percent | 40 |
| Dp | -85 |
| AOR | 1295.2 |
| Performance | 1210.2 |
Game statistics (History)
| Games | 137 |
| Wins | 64 |
| Draws | 13 |
| Losses | 60 |
| White | 66 |
| Black | 71 |
| White wins | 33 |
| Black wins | 31 |
| Score | 70.5 |
| Percent | 51.5 |
| Dp | 12.4 |
| AOR | 1262 |
| Performance | 1274.4 |
Rankings (Main)
| National | |
| Overall | 4393 |
| Gender | 3666 |
| Age group | 552 |
| Gender/Age | 405 |
| Provincial | |
| Overall | 1466 |
| Gender | 1231 |
| Age group | 167 |
| Gender/Age | 130 |
| Regional | |
| Overall | 145 |
| Gender | 125 |
| Age group | 20 |
| Gender/Age | 17 |
Rankings (Standard)
| National | |
| Overall | 3702 |
| Gender | 3077 |
| Age group | 458 |
| Gender/Age | 323 |
| Provincial | |
| Overall | 1293 |
| Gender | 1087 |
| Age group | 141 |
| Gender/Age | 106 |
| Regional | |
| Overall | 130 |
| Gender | 112 |
| Age group | 14 |
| Gender/Age | 12 |
Rankings (Rapid)
| National | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
| Provincial | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
| Regional | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
Rankings (Blitz)
| National | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
| Provincial | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
| Regional | |
| Overall | -1 |
| Gender | -1 |
| Age group | -1 |
| Gender/Age | -1 |
Performance ( )
| Games | 5 |
| Score | 2 |
| Percent | 40 |
| Aor | 1295.2 |
| Dp | -85 |
| Prat | 1210.2 |
Performance ()
| Games | 5 |
| Score | 2 |
| Percent | 40 |
| Aor | 1295.2 |
| Dp | -85 |
| Prat | 1210.2 |
Performance (12 months)
| Games | 25 |
| Score | 14 |
| Percent | 56 |
| Aor | 1311.5 |
| Dp | 51 |
| Prat | 1362.5 |
Performance (History)
| Games | 137 |
| Score | 70.5 |
| Percent | 51.5 |
| Aor | 1262 |
| Dp | 12.4 |
| Prat | 1274.4 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Nagel, D (Divan) | 6 | 2 | 4 | Hoerskool Drie Riviere Open 2023 (D) | Hoerskool Drie Riviere Open 08 March 2025 (D) | Details |
| Overall | 2 | Brand, HVN (Hendrik van Niekerk (Henko)) | 4 | 3 | 1 | Heidelberg Klub Open 2002 (D) | Dr Pieter Hangelbroek Rapid 2023 (C) | Details |
| Overall | 3 | Botha, S (Shadette) | 3 | 2 | 1 | Heidelberg Klub Open 2002 (D) | Laerskool Eligwa Open 20 Sept 2025 (D) | Details |
| Overall | 4 | Smit, L (Liane) | 3 | 2 | 1 | Hoerskool Drie Riviere Open 2023 (D) | Overvaal Ope Jul 2023 (D) | Details |
| Overall | 5 | Visser, AF (Aidan) | 2 | 0 | 2 | Midvaal Winter Classic 13 July 2024 (E) | Queens Gambit Chess Open 2024 (D) | Details |
| Standard | 1 | Nagel, D (Divan) | 4 | 1 | 3 | Hoerskool Drie Riviere Open 2023 (D) | Hoerskool Drie Riviere Open 08 March 2025 (D) | Details |
| Standard | 2 | Smit, L (Liane) | 3 | 2 | 1 | Hoerskool Drie Riviere Open 2023 (D) | Overvaal Ope Jul 2023 (D) | Details |
| Standard | 3 | Botha, S (Shadette) | 3 | 2 | 1 | Heidelberg Klub Open 2002 (D) | Laerskool Eligwa Open 20 Sept 2025 (D) | Details |
| Standard | 4 | Kruger, CJ (Juanika) | 2 | 1 | 1 | Fonteine Open 2024 (D) | Queens Gambit Chess Open 2024 (D) | Details |
| Standard | 5 | Wagner, E (Elona) | 2 | 1 | 1 | Overvaal Ope Jul 2023 (D) | HS Driehoek Chess Open 2025 (D) | Details |
| Rapid | 1 | Brand, HVN (Hendrik van Niekerk (Henko)) | 2 | 2 | 0 | VaalPark Primary Open Chess 2023 (C) | Dr Pieter Hangelbroek Rapid 2023 (C) | Details |
| Rapid | 2 | Nagel, D (Divan) | 2 | 1 | 1 | Dr Pieter Hangelbroek Rapid 2023 (C) | Midvaal Winter Classic 13 July 2024 (E) | Details |
| Rapid | 3 | Booysen, ZAJ (Zian) | 2 | 1 | 1 | Dr Pieter Hangelbroek Rapid 2023 (C) | Midvaal Winter Classic 13 July 2024 (E) | Details |