PLAYER PAGE
Guilliaume Albertus J Oberholster
1080142230ZF Mgcawu (NZF)Personal
Main rating
| Rating | 1497.7 |
| K-factor | 32 |
| Floor | 997.7 |
| Highest | 1497.7 (2026-02-28) |
| Min/Max +/- allowed | 108 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1416.9 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1497.7 |
| K-factor | 32 |
| Floor | 997.7 |
| Highest | 1497.7 (2026-02-28) |
| Min/Max +/- allowed | 108.5 |
Standard rating
| Rating | 1487.7 |
| K-factor | 32 |
| Floor | 987.7 |
| Highest | 1487.7 (2025-11-30) |
| Min/Max +/- allowed | 110.1 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1357 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1487.7 |
| K-factor | 32 |
| Floor | 987.7 |
| Highest | 1487.7 (2025-11-30) |
| Min/Max +/- allowed | 110.1 |
Rapid rating
| Rating | 1238.9 |
| K-factor | 36 |
| Floor | 738.9 |
| Highest | 1238.9 (2026-02-28) |
| Min/Max +/- allowed | 156.9 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1238.9 |
| K-factor | 36 |
| Floor | 738.9 |
| Highest | 1238.9 (2026-02-28) |
| Min/Max +/- allowed | 156.9 |
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 Veltie Royal Chess tournament (A) | Rapid | 2026-01-31 | 2026-01-31 | ZF Mgcawu (NZF) | 5 | 1481.5 | 5 | 4 | 1590.6 | 0 | Details |
| 2 | 2025 Veltie Royal Chess Tournament | Standard | 2025-10-31 | 2025-11-01 | ZF Mgcawu (NZF) | 5 | 1466.5 | 3 | 3 | 1611.3 | 0 | Details |
| 3 | Spartan Bishops Championships Elite 2025 (U18) | Standard | 2025-05-23 | 2025-05-25 | Frances Baard (NCF) | 5 | 1379.7 | 5 | 3 | 1403.3 | 0 | Details |
| 4 | 2025 ZFM Closed Chess Championship (U18) | Standard | 2025-05-09 | 2025-05-10 | ZF Mgcawu (NZF) | 5 | 1379.7 | 4 | 4 | 1642.2 | 0 | Details |
| 5 | Keimoes K & Q Chess Club Open 2025 (U18) | Standard | 2025-05-03 | 2025-05-03 | ZF Mgcawu (NZF) | 6 | 1379.7 | 6 | 4.5 | 1517.5 | 0 | Details |
| 6 | Grey College Team Championship 2025 (A) | Standard | 2025-02-21 | 2025-02-22 | Mangaung (FMB) | 5 | 1375.4 | 5 | 3 | 1441.1 | 0 | Details |
| 7 | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | Standard | 2025-01-31 | 2025-02-01 | ZF Mgcawu (NZF) | 5 | 1375.4 | 5 | 3 | 1237.8 | 0 | Details |
| 8 | Mzansi Interprovincial Youth Chess Championships 2024 (U18 Open Championship) | Classical | 2024-12-16 | 2024-12-19 | Capricorn (LCP) | 7 | 1352 | 7 | 2.5 | 1283.3 | 0 | Details |
| 9 | Paarl Boys' High Chess Festival 2024 (Elite) | Standard | 2024-10-04 | 2024-10-05 | Cape Winelands (WCW) | 6 | 1349.6 | 5 | 2.5 | 1371.5 | 0 | Details |
| 10 | 2024 South Africa National Schools Chess Championship (U18 Boys) | Standard | 2024-09-27 | 2024-09-28 | Nelson Mandela Bay (ENM) | 7 | 1427.6 | 7 | 1.5 | 1104 | 0 | Details |
| 11 | 2024 NC Closed Chess Championships (U18+U20) | Standard | 2024-08-23 | 2024-08-25 | Frances Baard (NCF) | 5 | 1405.6 | 5 | 4 | 1536.7 | 0 | Details |
| 12 | 2024 Duineveld Open Toernooi (U16) | Standard | 2024-07-20 | 2024-07-20 | ZF Mgcawu (NZF) | 5 | 1406.7 | 5 | 4 | 1326.2 | 0 | Details |
| 13 | Spartan Bishops Chess Championships 2024 (Bishops) | Standard | 2024-05-04 | 2024-05-05 | Bojanala Platina (NBR) | 5 | 1383.3 | 5 | 3.5 | 1540.1 | 0 | Details |
| 14 | Grey College Team Championship 2024 (B) | Standard | 2024-02-23 | 2024-02-24 | Mangaung (FMB) | 5 | 1391.8 | 5 | 3 | 1342.7 | 0 | Details |
| 15 | Paarl Boys High Chess Festival 2023 (Elite Division) | Standard | 2023-10-13 | 2023-10-14 | Cape Winelands (WCW) | 6 | 1415.2 | 5 | 1.5 | 1243.2 | 0 | Details |
| 16 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Standard | 2023-08-25 | 2023-08-27 | Frances Baard (NCF) | 5 | 1364 | 5 | 4 | 1510 | 0 | Details |
| 17 | ZFM Trials 2023 (U15 Boys) | Standard | 2023-06-03 | 2023-06-03 | ZF Mgcawu (NZF) | 5 | 1309.7 | 5 | 4 | 1460.3 | 0 | Details |
| 18 | Inter Regional Chess Championship 2023 (U16) | Standard | 2023-05-19 | 2023-05-20 | Mangaung (FMB) | 5 | 1250.4 | 5 | 4 | 1577.8 | 0 | Details |
| 19 | Grey College Team Championship 2023 (B) | Standard | 2023-02-03 | 2023-02-04 | Mangaung (FMB) | 5 | 1253.4 | 5 | 3 | 1240.7 | 0 | Details |
| 20 | Diamond Chess Academy Junior Championships 2022 (U15) | Standard | 2022-08-06 | 2022-08-06 | Frances Baard (NCF) | 5 | 1232.5 | 5 | 3.5 | 1341.4 | 0 | Details |
| 21 | Northern Cape Provincial Schools Trials 2022 (U15 Boys) | Standard | 2022-06-24 | 2022-06-24 | Frances Baard (NCF) | 5 | 1229.5 | 5 | 3 | 1252 | 0 | Details |
| 22 | ZFM Schools Trials 2022 (U15 Boys) | Standard | 2022-05-28 | 2022-05-28 | ZF Mgcawu (NZF) | 5 | 1200 | 5 | 3.5 | 1358.1 | 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 | 5 |
| Wins | 4 |
| Draws | 0 |
| Losses | 1 |
| White | 2 |
| Black | 3 |
| White wins | 2 |
| Black wins | 2 |
| Score | 4 |
| Percent | 80 |
| Dp | 255 |
| AOR | 1335.6 |
| Performance | 1590.6 |
Game statistics (History)
| Games | 112 |
| Wins | 68 |
| Draws | 8 |
| Losses | 36 |
| White | 57 |
| Black | 55 |
| White wins | 34 |
| Black wins | 34 |
| Score | 72 |
| Percent | 64.3 |
| Dp | 121.4 |
| AOR | 1272.2 |
| Performance | 1393.6 |
Rankings (Main)
| National | |
| Overall | 1843 |
| Gender | 1619 |
| Age group | 224 |
| Gender/Age | 188 |
| Provincial | |
| Overall | 46 |
| Gender | 41 |
| Age group | 9 |
| Gender/Age | 8 |
| Regional | |
| Overall | 3 |
| Gender | 2 |
| Age group | 1 |
| Gender/Age | 1 |
Rankings (Standard)
| National | |
| Overall | 1804 |
| Gender | 1571 |
| Age group | 215 |
| Gender/Age | 180 |
| Provincial | |
| Overall | 47 |
| Gender | 42 |
| Age group | 9 |
| Gender/Age | 8 |
| Regional | |
| Overall | 3 |
| Gender | 2 |
| Age group | 1 |
| Gender/Age | 1 |
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 | 5 |
| Score | 4 |
| Percent | 80 |
| Aor | 1335.6 |
| Dp | 255 |
| Prat | 1590.6 |
Performance (12 months)
| Games | 23 |
| Score | 18.5 |
| Percent | 80.4 |
| Aor | 1283.8 |
| Dp | 258.7 |
| Prat | 1542.5 |
Performance (History)
| Games | 112 |
| Score | 72 |
| Percent | 64.3 |
| Aor | 1272.2 |
| Dp | 121.4 |
| Prat | 1393.6 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Cloete, A (Allison) | 3 | 2 | 1 | 2024 Duineveld Open Toernooi (U16) | 2025 Veltie Royal Chess tournament (A) | Details |
| Overall | 2 | Seleko, O (Onalenna) | 3 | 1 | 2 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Spartan Bishops Championships Elite 2025 (U18) | Details |
| Overall | 3 | Louwrens, C (Christo) | 3 | 1 | 2 | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | 2025 Veltie Royal Chess tournament (A) | Details |
| Overall | 4 | Viviers, H (Hanré) | 3 | 1 | 2 | 2024 NC Closed Chess Championships (U18+U20) | 2025 Veltie Royal Chess tournament (A) | Details |
| Overall | 5 | Mwelwa, P (Palo) | 2 | 2 | 0 | Spartan Bishops Chess Championships 2024 (Bishops) | Paarl Boys' High Chess Festival 2024 (Elite) | Details |
| Standard | 1 | Seleko, O (Onalenna) | 3 | 1 | 2 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Spartan Bishops Championships Elite 2025 (U18) | Details |
| Standard | 2 | Cloete, A (Allison) | 2 | 1 | 1 | 2024 Duineveld Open Toernooi (U16) | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | Details |
| Standard | 3 | Green, J (Jordan) | 2 | 1 | 1 | ZFM Schools Trials 2022 (U15 Boys) | Spartan Bishops Championships Elite 2025 (U18) | Details |
| Standard | 4 | Mwelwa, P (Palo) | 2 | 2 | 0 | Spartan Bishops Chess Championships 2024 (Bishops) | Paarl Boys' High Chess Festival 2024 (Elite) | Details |
| Standard | 5 | Du Plessis, M (Marlon) | 2 | 1 | 1 | 2024 Duineveld Open Toernooi (U16) | Keimoes K & Q Chess Club Open 2025 (U18) | Details |