PLAYER PAGE
Guilliaume Albertus J Oberholster
1080142230ZF Mgcawu (NZF)Personal
Main rating
| Rating | 1461.8 |
| 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 | 1391.5 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1461.8 |
| K-factor | 32 |
| Floor | 997.7 |
| Highest | 1497.7 (2026-02-28) |
| Min/Max +/- allowed | 108.5 |
Standard rating
| Rating | 1451.5 |
| 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 | 1371.5 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1451.5 |
| 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 | Inter Regional Chess Championship 2026 (Individual U20) | Standard | 2026-05-22 | 2026-05-23 | Mangaung (FMB) | 5 | 1463.9 | 5 | 3 | 1442.6 | -2.1 | Details |
| 2 | 2026 Northern Cape Open Chess Championship (B) | Standard | 2026-04-17 | 2026-04-19 | Frances Baard (NCF) | 7 | 1497.7 | 7 | 3.5 | 1354.3 | -33.8 | Details |
| 3 | 2025 Veltie Royal Chess tournament (A) | Rapid | 2026-01-31 | 2026-01-31 | ZF Mgcawu (NZF) | 5 | 1481.5 | 5 | 4 | 1590.6 | 5.4 | Details |
| 4 | 2025 Veltie Royal Chess Tournament | Standard | 2025-10-31 | 2025-11-01 | ZF Mgcawu (NZF) | 5 | 1466.5 | 3 | 3 | 1611.3 | 9.3 | Details |
| 5 | Spartan Bishops Championships Elite 2025 (U18) | Standard | 2025-05-23 | 2025-05-25 | Frances Baard (NCF) | 5 | 1379.7 | 5 | 3 | 1403.3 | 1.7 | Details |
| 6 | 2025 ZFM Closed Chess Championship (U18) | Standard | 2025-05-09 | 2025-05-10 | ZF Mgcawu (NZF) | 5 | 1379.7 | 4 | 4 | 1642.2 | 20.6 | Details |
| 7 | 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 | 16.3 | Details |
| 8 | Grey College Team Championship 2025 (A) | Standard | 2025-02-21 | 2025-02-22 | Mangaung (FMB) | 5 | 1375.4 | 5 | 3 | 1441.1 | 5.9 | Details |
| 9 | 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 | -10.3 | Details |
| 10 | 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 | -12.2 | Details |
| 11 | 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 | 1.5 | Details |
| 12 | 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 | -48.9 | Details |
| 13 | 2024 NC Closed Chess Championships (U18+U20) | Standard | 2024-08-23 | 2024-08-25 | Frances Baard (NCF) | 5 | 1405.6 | 5 | 4 | 1536.7 | 13.8 | Details |
| 14 | 2024 Duineveld Open Toernooi (U16) | Standard | 2024-07-20 | 2024-07-20 | ZF Mgcawu (NZF) | 5 | 1406.7 | 5 | 4 | 1326.2 | -0.7 | Details |
| 15 | Spartan Bishops Chess Championships 2024 (Bishops) | Standard | 2024-05-04 | 2024-05-05 | Bojanala Platina (NBR) | 5 | 1383.3 | 5 | 3.5 | 1540.1 | 14.6 | Details |
| 16 | Grey College Team Championship 2024 (B) | Standard | 2024-02-23 | 2024-02-24 | Mangaung (FMB) | 5 | 1391.8 | 5 | 3 | 1342.7 | -5.3 | Details |
| 17 | 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 | -14.8 | Details |
| 18 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Standard | 2023-08-25 | 2023-08-27 | Frances Baard (NCF) | 5 | 1364 | 5 | 4 | 1510 | 17.2 | Details |
| 19 | ZFM Trials 2023 (U15 Boys) | Standard | 2023-06-03 | 2023-06-03 | ZF Mgcawu (NZF) | 5 | 1309.7 | 5 | 4 | 1460.3 | 15.4 | Details |
| 20 | Inter Regional Chess Championship 2023 (U16) | Standard | 2023-05-19 | 2023-05-20 | Mangaung (FMB) | 5 | 1250.4 | 5 | 4 | 1577.8 | 32.9 | Details |
| 21 | Grey College Team Championship 2023 (B) | Standard | 2023-02-03 | 2023-02-04 | Mangaung (FMB) | 5 | 1253.4 | 5 | 3 | 1240.7 | -1.8 | Details |
| 22 | 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 | 11.6 | Details |
| 23 | Northern Cape Provincial Schools Trials 2022 (U15 Boys) | Standard | 2022-06-24 | 2022-06-24 | Frances Baard (NCF) | 5 | 1229.5 | 5 | 3 | 1252 | 1.5 | Details |
| 24 | ZFM Schools Trials 2022 (U15 Boys) | Standard | 2022-05-28 | 2022-05-28 | ZF Mgcawu (NZF) | 5 | 1200 | 5 | 3.5 | 1358.1 | 14.8 | 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 | 17 |
| Wins | 10 |
| Draws | 1 |
| Losses | 6 |
| White | 7 |
| Black | 10 |
| White wins | 4 |
| Black wins | 6 |
| Score | 10.5 |
| Percent | 61.8 |
| Dp | 100 |
| AOR | 1349.8 |
| Performance | 1449.8 |
Game statistics (History)
| Games | 124 |
| Wins | 74 |
| Draws | 9 |
| Losses | 41 |
| White | 62 |
| Black | 62 |
| White wins | 36 |
| Black wins | 38 |
| Score | 78.5 |
| Percent | 63.3 |
| Dp | 113.1 |
| AOR | 1280.3 |
| Performance | 1393.4 |
Rankings (Main)
| National | |
| Overall | 2508 |
| Gender | 2165 |
| Age group | 303 |
| Gender/Age | 249 |
| Provincial | |
| Overall | 67 |
| Gender | 60 |
| Age group | 11 |
| Gender/Age | 10 |
| Regional | |
| Overall | 5 |
| Gender | 4 |
| Age group | 1 |
| Gender/Age | 1 |
Rankings (Standard)
| National | |
| Overall | 2394 |
| Gender | 2047 |
| Age group | 298 |
| Gender/Age | 241 |
| Provincial | |
| Overall | 65 |
| Gender | 59 |
| Age group | 11 |
| Gender/Age | 10 |
| Regional | |
| Overall | 5 |
| Gender | 4 |
| 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 | 17 |
| Score | 10.5 |
| Percent | 61.8 |
| Aor | 1349.8 |
| Dp | 100 |
| Prat | 1449.8 |
Performance (12 months)
| Games | 20 |
| Score | 13.5 |
| Percent | 67.5 |
| Aor | 1325.3 |
| Dp | 148.8 |
| Prat | 1474 |
Performance (History)
| Games | 124 |
| Score | 78.5 |
| Percent | 63.3 |
| Aor | 1280.3 |
| Dp | 113.1 |
| Prat | 1393.4 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Green, J (Jordan) | 4 | 2 | 2 | ZFM Schools Trials 2022 (U15 Boys) | Inter Regional Chess Championship 2026 (Individual U20) | Details |
| Overall | 2 | Louwrens, C (Christo) | 4 | 2 | 2 | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | 2026 Northern Cape Open Chess Championship (B) | Details |
| Overall | 3 | Cloete, A (Allison) | 3 | 2 | 1 | 2024 Duineveld Open Toernooi (U16) | 2025 Veltie Royal Chess tournament (A) | Details |
| Overall | 4 | Seleko, O (Onalenna) | 3 | 1 | 2 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Spartan Bishops Championships Elite 2025 (U18) | Details |
| Overall | 5 | Viviers, H (Hanré) | 3 | 1 | 2 | 2024 NC Closed Chess Championships (U18+U20) | 2025 Veltie Royal Chess tournament (A) | Details |
| Standard | 1 | Green, J (Jordan) | 4 | 2 | 2 | ZFM Schools Trials 2022 (U15 Boys) | Inter Regional Chess Championship 2026 (Individual U20) | Details |
| Standard | 2 | Louwrens, C (Christo) | 3 | 2 | 1 | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | 2026 Northern Cape Open Chess Championship (B) | Details |
| Standard | 3 | Nel, C (Caleb) | 3 | 0 | 3 | Keimoes K & Q Chess Club Open 2025 (U18) | Inter Regional Chess Championship 2026 (Individual U20) | Details |
| Standard | 4 | Seleko, O (Onalenna) | 3 | 1 | 2 | 2023 Northern Cape Closed Chess Championships (U16 Open) | Spartan Bishops Championships Elite 2025 (U18) | Details |
| Standard | 5 | Cloete, A (Allison) | 2 | 1 | 1 | 2024 Duineveld Open Toernooi (U16) | Veltie Royal Klub Toernooi 31 Jan tot 1 Feb 2025 (A) | Details |