PLAYER PAGE
Wihan Koster
1060134033Tshwane (GTP)Personal
Main rating
| Rating | 1443.4 |
| K-factor | 32 |
| Floor | 947.6 |
| Highest | 1647.6 (2021-04-01) |
| Min/Max +/- allowed | 88 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1278.7 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1443.4 |
| K-factor | 32 |
| Floor | 947.6 |
| Highest | 1647.6 (2021-04-01) |
| Min/Max +/- allowed | 87.6 |
Standard rating
| Rating | 1447.9 |
| K-factor | 32 |
| Floor | 947.9 |
| Highest | 1644.1 (2021-04-01) |
| Min/Max +/- allowed | 88.1 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1321.9 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1447.9 |
| K-factor | 32 |
| Floor | 947.9 |
| Highest | 1644.1 (2021-04-01) |
| Min/Max +/- allowed | 88.1 |
Rapid rating
| Rating | 1230.1 |
| K-factor | 36 |
| Floor | 748.2 |
| Highest | 1388.5 (2021-10-01) |
| Min/Max +/- allowed | 126.8 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1230.1 |
| K-factor | 36 |
| Floor | 748.2 |
| Highest | 1388.5 (2021-10-01) |
| Min/Max +/- allowed | 126.8 |
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 |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | 2025 Tshwane South School District CLOSED League Championship (U19A) | Standard | 2025-08-16 | 2025-08-16 | Tshwane (GTP) | 5 | 1413.5 | 5 | 4.5 | 1610.6 | 0 | Details |
| 2 | Gauteng Inter-Region at UJ 2024 (U20) | Standard | 2024-12-07 | 2024-12-08 | Johannesburg Metro (GJM) | 5 | 1386.8 | 5 | 1 | 1509 | 0 | Details |
| 3 | Gauteng Top Schools 2024 (U19 Open) | Rapid | 2024-10-05 | 2024-10-05 | Ekurhuleni (GE) | 5 | 1417.4 | 5 | 1 | 1164.3 | 0 | Details |
| 4 | D4 Tshwane South District Schools Teams Chess Tournament 2024 (U19A) | Standard | 2024-08-03 | 2024-08-03 | Tshwane (GTP) | 5 | 1431.7 | 5 | 2.5 | 1331.4 | 0 | Details |
| 5 | 2024 Tshwane South School District CLOSED Individual Championships (U18 Mixed) | Standard | 2024-05-11 | 2024-05-11 | Tshwane (GTP) | 5 | 1426.9 | 5 | 3.5 | 1464.6 | 0 | Details |
| 6 | 2024 Lubowski Open Chess Tournament (C) | Standard | 2024-03-23 | 2024-03-24 | Tshwane (GTP) | 5 | 1421.2 | 5 | 3 | 1463.4 | 0 | Details |
| 7 | 2024 Tshwane Chess AHS Open Chess Tournament (B) | Standard | 2024-02-24 | 2024-02-24 | Tshwane (GTP) | 5 | 1439.3 | 5 | 1 | 1320 | 0 | Details |
| 8 | 2024 Gauteng Inter-Region Chess Championship (U18A) | Standard | 2024-01-13 | 2024-01-14 | Tshwane (GTP) | 5 | 1405.9 | 5 | 4 | 1586.2 | 0 | Details |
| 9 | 2023 Gauteng Top Schools (U19 Mixed) | Standard | 2023-08-19 | 2023-08-19 | West Rand (GWR) | 5 | 1441.5 | 5 | 2.5 | 1203.7 | 0 | Details |
| 10 | 2023 Tshwane South School District CLOSED League Championship (U19) | Standard | 2023-07-29 | 2023-07-29 | Tshwane (GTP) | 5 | 1447.6 | 5 | 2.5 | 1423.6 | 0 | Details |
| 11 | 2023 Lubowski Open Tournament (B) | Standard | 2023-06-24 | 2023-06-25 | Tshwane (GTP) | 5 | 1432.9 | 5 | 3.5 | 1510.7 | 0 | Details |
| 12 | 2023 Tshwane South School District CLOSED Individual Championships (U18 Open) | Standard | 2023-04-22 | 2023-04-22 | Tshwane (GTP) | 5 | 1436.9 | 5 | 3 | 1436.9 | 0 | Details |
| 13 | 2023 Afrikaans Hoër Seunskool Open Chess Tournament (B) | Standard | 2023-03-04 | 2023-03-04 | Tshwane (GTP) | 5 | 1429.2 | 4 | 2.5 | 1491 | 0 | Details |
| 14 | Grey College Team Championship 2023 (A) | Standard | 2023-02-03 | 2023-02-04 | Mangaung (FMB) | 5 | 1407.2 | 5 | 4 | 1541.4 | 0 | Details |
| 15 | 2022 South African Junior Team Chess Championships (U18 Open) | Classical | 2022-12-04 | 2022-12-08 | 4 Knights (4K) | 7 | 1440.5 | 7 | 3.5 | 1308.3 | 0 | Details |
| 16 | Afrikaanse Hoër Seunskool Interne Skaak KampioenskAP 2022 | Rapid | 2022-09-22 | 2022-09-22 | Tshwane (GTP) | 7 | 1397.1 | 7 | 5.5 | 1535.4 | 0 | Details |
| 17 | 2022 Etienne Lewis (U18+U20 Open+Girls) | Standard | 2022-09-02 | 2022-09-04 | Tshwane (GTP) | 7 | 1397.1 | 6 | 3.5 | 1513.2 | 0 | Details |
| 18 | 2022 Gauteng Schools Team Championships (U17 Open) | Standard | 2022-08-26 | 2022-08-26 | Tshwane (GTP) | 5 | 1409.8 | 5 | 2.5 | 1334.8 | 0 | Details |
| 19 | 2022 Blou Bul Open (B) | Standard | 2022-06-25 | 2022-06-26 | Tshwane (GTP) | 5 | 1372.6 | 5 | 2.5 | 1455.8 | 0 | Details |
| 20 | 2022 Milos Ristic Open Chess Tournament (C) | Standard | 2022-05-28 | 2022-05-28 | Tshwane (GTP) | 5 | 1327.2 | 5 | 4.5 | 1576 | 0 | Details |
| 21 | 2022 Gauteng Interregion (U16 Open) | Standard | 2022-02-26 | 2022-02-26 | Tshwane (GTP) | 5 | 1348.7 | 5 | 3 | 1355.1 | 0 | Details |
| 22 | Piet Robertse 2022 (C) | Standard | 2022-02-05 | 2022-02-05 | Tshwane (GTP) | 5 | 1348.7 | 5 | 2.5 | 1199.4 | 0 | Details |
| 23 | Grey College Team Championship 2022 (A) | Standard | 2022-02-18 | 2022-02-19 | Mangaung (FMB) | 5 | 1348.7 | 5 | 3 | 1371.4 | 0 | Details |
| 24 | 2021 Milos Ristic Open (C) | Standard | 2021-10-09 | 2021-10-09 | Tshwane (GTP) | 5 | 1315.4 | 5 | 3.5 | 1421.9 | 0 | Details |
| 25 | 2021 Affies Interhuis | Rapid | 2021-10-28 | 2021-10-28 | Tshwane (GTP) | 5 | 1315.4 | 5 | 4 | 1424.5 | 0 | Details |
| 26 | 2021 Etienne Lewis Closed Trials (U16 Open) | Standard | 2021-09-24 | 2021-09-26 | Nelson Mandela Bay (ENM) | 7 | 1305.2 | 7 | 3 | 1347.4 | 0 | Details |
| 27 | 2021 Lubowski Open Tournament (C) | Standard | 2021-05-01 | 2021-05-02 | Tshwane (GTP) | 5 | 1287.6 | 5 | 3.5 | 1367.9 | 0 | Details |
| 28 | 2021 Blou Bul Tournament (D) | Standard | 2021-04-10 | 2021-04-10 | Mangaung (FMB) | 5 | 1200 | 5 | 5 | 1642.5 | 0 | Details |
Game statistics ( )
| Games | 0 |
| Wins | 0 |
| Draws | 0 |
| Losses | 0 |
| White | 0 |
| Black | 0 |
| White wins | 0 |
| Black wins | 0 |
| Score | 0 |
| Percent | 0 |
| Dp | 0 |
| AOR | 0 |
| Performance | 0 |
Game statistics ()
| Games | 0 |
| Wins | 0 |
| Draws | 0 |
| Losses | 0 |
| White | 0 |
| Black | 0 |
| White wins | 0 |
| Black wins | 0 |
| Score | 0 |
| Percent | 0 |
| Dp | 0 |
| AOR | 0 |
| Performance | 0 |
Game statistics (History)
| Games | 146 |
| Wins | 78 |
| Draws | 20 |
| Losses | 48 |
| White | 72 |
| Black | 74 |
| White wins | 39 |
| Black wins | 39 |
| Score | 88 |
| Percent | 60.3 |
| Dp | 87.3 |
| AOR | 1337 |
| Performance | 1424.4 |
Rankings (Main)
| National | |
| Overall | 2520 |
| Gender | 2173 |
| Age group | 896 |
| Gender/Age | 839 |
| Provincial | |
| Overall | 866 |
| Gender | 740 |
| Age group | 283 |
| Gender/Age | 268 |
| Regional | |
| Overall | 321 |
| Gender | 267 |
| Age group | 102 |
| Gender/Age | 96 |
Rankings (Standard)
| National | |
| Overall | 2222 |
| Gender | 1916 |
| Age group | 780 |
| Gender/Age | 731 |
| Provincial | |
| Overall | 795 |
| Gender | 676 |
| Age group | 258 |
| Gender/Age | 245 |
| Regional | |
| Overall | 300 |
| Gender | 249 |
| Age group | 98 |
| Gender/Age | 93 |
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 | 0 |
| Score | 0 |
| Percent | 0 |
| Aor | 0 |
| Dp | 0 |
| Prat | 0 |
Performance ()
| Games | 0 |
| Score | 0 |
| Percent | 0 |
| Aor | 0 |
| Dp | 0 |
| Prat | 0 |
Performance (12 months)
| Games | 5 |
| Score | 4.5 |
| Percent | 90 |
| Aor | 1270.6 |
| Dp | 340 |
| Prat | 1610.6 |
Performance (History)
| Games | 146 |
| Score | 88 |
| Percent | 60.3 |
| Aor | 1337 |
| Dp | 87.3 |
| Prat | 1424.4 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Rautenbach, H (Helen Christine) | 3 | 1 | 2 | 2022 Blou Bul Open (B) | Gauteng Top Schools 2024 (U19 Open) | Details |
| Overall | 2 | Soobramaniyen, M (Moreshan) | 2 | 1 | 1 | 2021 Milos Ristic Open (C) | 2023 Tshwane South School District CLOSED League Championship (U19) | Details |
| Overall | 3 | Kruger, N (Neeke) | 2 | 1 | 1 | 2021 Etienne Lewis Closed Trials (U16 Open) | Piet Robertse 2022 (C) | Details |
| Overall | 4 | Gondwe, P (Prosper) | 2 | 1 | 1 | 2021 Blou Bul Tournament (D) | 2023 Afrikaans Hoër Seunskool Open Chess Tournament (B) | Details |
| Overall | 5 | Slabbert, ZN (Zander Nicolaas) | 2 | 2 | 0 | 2022 Blou Bul Open (B) | 2024 Tshwane Chess AHS Open Chess Tournament (B) | Details |
| Standard | 1 | Gondwe, P (Prosper) | 2 | 1 | 1 | 2021 Blou Bul Tournament (D) | 2023 Afrikaans Hoër Seunskool Open Chess Tournament (B) | Details |
| Standard | 2 | Soobramaniyen, M (Moreshan) | 2 | 1 | 1 | 2021 Milos Ristic Open (C) | 2023 Tshwane South School District CLOSED League Championship (U19) | Details |
| Standard | 3 | Oosthuizen, MJ (Michal Jacobus) | 2 | 1 | 1 | 2023 Tshwane South School District CLOSED Individual Championships (U18 Open) | 2023 Tshwane South School District CLOSED League Championship (U19) | Details |
| Standard | 4 | Kruger, N (Neeke) | 2 | 1 | 1 | 2021 Etienne Lewis Closed Trials (U16 Open) | Piet Robertse 2022 (C) | Details |
| Standard | 5 | Makhafola, R (Rearabiloe) | 2 | 1 | 1 | 2024 Tshwane South School District CLOSED Individual Championships (U18 Mixed) | D4 Tshwane South District Schools Teams Chess Tournament 2024 (U19A) | Details |