PLAYER PAGE
Isabelle de Villiers
2160314888Overberg (WOS)Personal
Main rating
| Rating | 1371.1 |
| K-factor | 36 |
| Floor | 884.8 |
| Highest | 1384.8 (2026-02-28) |
| Min/Max +/- allowed | 127 |
| Rating Change () | |
| Games | 18 |
| Score | 6 |
| We | 8.57 |
| SWe | -1.15 |
| Temp +/- | -41.5 |
| Penalties | 0 |
| Weight perform | 1232 |
| Final +/- | -41.5 |
| New Rating () | |
| Rating | 1329.6 |
| K-factor | 36 |
| Floor | 884.8 |
| Highest | 1384.8 (2026-02-28) |
| Min/Max +/- allowed | 127.4 |
Standard rating
| Rating | 1378.5 |
| K-factor | 36 |
| Floor | 898.2 |
| Highest | 1398.2 (2026-01-01) |
| Min/Max +/- allowed | 125 |
| Rating Change () | |
| Games | 9 |
| Score | 4 |
| We | 4.77 |
| SWe | -0.77 |
| Temp +/- | -27.9 |
| Penalties | 0 |
| Weight perform | 1343.1 |
| Final +/- | -27.9 |
| New Rating () | |
| Rating | 1350.6 |
| K-factor | 36 |
| Floor | 898.2 |
| Highest | 1398.2 (2026-01-01) |
| Min/Max +/- allowed | 125 |
Rapid rating
| Rating | 1317.2 |
| K-factor | 36 |
| Floor | 817 |
| Highest | 1323.6 (2025-09-30) |
| Min/Max +/- allowed | 139 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1297.6 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1317.2 |
| K-factor | 36 |
| Floor | 817 |
| Highest | 1323.6 (2025-09-30) |
| Min/Max +/- allowed | 139 |
Blitz rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2025-03-01) |
| Min/Max +/- allowed | 165.8 |
| Rating Change () | |
| Games | 9 |
| Score | 2 |
| We | 4.47 |
| SWe | -2.47 |
| Temp +/- | -89.1 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | -89.1 |
| New Rating () | |
| Rating | 1110.9 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2025-03-01) |
| Min/Max +/- allowed | 165.8 |
Rating Graph
Tournaments
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | South African Junior Closed Chess Championship 2026 (U10 Girls) | Classical | 2026-03-28 | 2026-04-02 | Bojanala Platina (NBR) | 9 | 1371.1 | 9 | 4 | 1295.3 | -30.3 | Details |
| 2 | South African Junior Closed Chess Championship 2026 (Blitz) | Blitz | 2026-03-31 | 2026-03-31 | Bojanala Platina (NBR) | 9 | 1371.1 | 9 | 2 | 1204.6 | -11.2 | Details |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | Overberg Schools Primary School Closed 2026 (U11 Girls) | Standard | 2026-03-21 | 2026-03-21 | Overberg (WOS) | 5 | 1384.8 | 5 | 3 | 1304.3 | -12.6 | Details |
| 2 | Overberg Schools Primary School Trials (Region 1) 2026 (U11 Girls) | Rapid | 2026-02-28 | 2026-02-28 | Overberg | 6 | 1384.8 | 6 | 4 | 1375.7 | -1.2 | Details |
| 3 | Overberg Schools Open Championship 2026 (U11) | Rapid | 2026-01-31 | 2026-01-31 | Overberg (WOS) | 6 | 1383.9 | 6 | 4 | 1386.9 | 0.3 | Details |
| 4 | 2025 Mzansi Inter Provincial Team Championships (U10 Combined) | Standard | 2025-12-15 | 2025-12-17 | Nelson Mandela Bay (ENM) | 6 | 1330.4 | 6 | 5 | 1571.9 | 29.7 | Details |
| 5 | UCT Open Chess Championship 2025 (U10) | Rapid | 2025-10-11 | 2025-10-11 | Cape Town (WCT) | 6 | 1353.8 | 6 | 2 | 1182.5 | -13.1 | Details |
| 6 | Kingsway Chess Open 2025 (U10) | Rapid | 2025-09-20 | 2025-09-20 | Overberg (WOS) | 6 | 1346 | 6 | 4 | 1410.8 | 4.3 | Details |
| 7 | De Villiers PS 2025 (U10 Boys+Girls) | Rapid | 2025-08-16 | 2025-08-16 | Cape Winelands (WCW) | 5 | 1343.6 | 5 | 3 | 1353.5 | 1.3 | Details |
| 8 | Cape Winelands Open 2025 (U10) | Standard | 2025-07-19 | 2025-07-19 | Cape Winelands (WCW) | 5 | 1323.1 | 5 | 3 | 1447.6 | 11.5 | Details |
| 9 | Cape Winelands Queens 2025 (U9) | Rapid | 2025-06-21 | 2025-06-21 | Cape Winelands (WCW) | 6 | 1313.2 | 6 | 4 | 1384 | 5.5 | Details |
| 10 | Western Cape Schools Individual Championship 2025 (U9 Girls) | Standard | 2025-05-17 | 2025-05-18 | Cape Winelands (WCW) | 6 | 1262.5 | 6 | 4 | 1457.5 | 22.7 | Details |
| 11 | Brave Knights Rapid 2025 (U9) | Rapid | 2025-05-03 | 2025-05-03 | Cape Winelands (WCW) | 6 | 1262.5 | 6 | 3 | 1335.8 | 5.4 | Details |
| 12 | Hermanus Chess Club Open 2025 (U10) | Rapid | 2025-04-12 | 2025-04-12 | Overberg (WOS) | 7 | 1262.5 | 0 | 0 | 0 | 0 | Details |
| 13 | Overberg Schools - PS Closed 2025 (U9 Girls) | Standard | 2025-03-08 | 2025-03-08 | Overberg (WOS) | 5 | 1221.2 | 5 | 4 | 1449 | 22.9 | Details |
| 14 | Overberg Schools - PS Trials (Region 1) 2025 (U9 Girls) | Rapid | 2025-02-22 | 2025-02-22 | Overberg (WOS) | 6 | 1200 | 6 | 4.5 | 1393.9 | 16.6 | Details |
| 15 | Curro Hermanus Summer Open 2025 (U9) | Rapid | 2025-02-08 | 2025-02-08 | Overberg (WOS) | 6 | 1200 | 6 | 2.5 | 1130.1 | -5.9 | 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 | 35 |
| Wins | 17 |
| Draws | 0 |
| Losses | 18 |
| White | 17 |
| Black | 18 |
| White wins | 7 |
| Black wins | 10 |
| Score | 17 |
| Percent | 48.6 |
| Dp | -12.1 |
| AOR | 1314.9 |
| Performance | 1302.8 |
Game statistics (History)
| Games | 98 |
| Wins | 55 |
| Draws | 2 |
| Losses | 41 |
| White | 48 |
| Black | 50 |
| White wins | 25 |
| Black wins | 30 |
| Score | 56 |
| Percent | 57.1 |
| Dp | 60.7 |
| AOR | 1286.7 |
| Performance | 1347.4 |
Rankings (Main)
| National | |
| Overall | 4075 |
| Gender | 670 |
| Age group | 348 |
| Gender/Age | 87 |
| Provincial | |
| Overall | 1276 |
| Gender | 270 |
| Age group | 125 |
| Gender/Age | 45 |
| Regional | |
| Overall | 80 |
| Gender | 27 |
| Age group | 12 |
| Gender/Age | 5 |
Rankings (Standard)
| National | |
| Overall | 3513 |
| Gender | 578 |
| Age group | 294 |
| Gender/Age | 68 |
| Provincial | |
| Overall | 1039 |
| Gender | 227 |
| Age group | 95 |
| Gender/Age | 34 |
| Regional | |
| Overall | 50 |
| Gender | 19 |
| Age group | 5 |
| Gender/Age | 3 |
Rankings (Rapid)
| National | |
| Overall | 1692 |
| Gender | 279 |
| Age group | 203 |
| Gender/Age | 42 |
| Provincial | |
| Overall | 778 |
| Gender | 139 |
| Age group | 104 |
| Gender/Age | 28 |
| Regional | |
| Overall | 90 |
| Gender | 28 |
| Age group | 12 |
| Gender/Age | 5 |
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 | 9 |
| Score | 4 |
| Percent | 44.4 |
| Aor | 1342.5 |
| Dp | -47.2 |
| Prat | 1295.3 |
Performance ()
| Games | 35 |
| Score | 17 |
| Percent | 48.6 |
| Aor | 1314.9 |
| Dp | -12.1 |
| Prat | 1302.8 |
Performance (12 months)
| Games | 81 |
| Score | 45 |
| Percent | 55.6 |
| Aor | 1306.6 |
| Dp | 47.2 |
| Prat | 1353.8 |
Performance (History)
| Games | 98 |
| Score | 56 |
| Percent | 57.1 |
| Aor | 1286.7 |
| Dp | 60.7 |
| Prat | 1347.4 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Marais, J (Janli) | 3 | 3 | 0 | Overberg Schools - PS Trials (Region 1) 2025 (U9 Girls) | Overberg Schools Primary School Closed 2026 (U11 Girls) | Details |
| Overall | 2 | Van Der Westhuizen, E (Erin) | 2 | 0 | 2 | Overberg Schools - PS Trials (Region 1) 2025 (U9 Girls) | Overberg Schools Primary School Trials (Region 1) 2026 (U11 Girls) | Details |
| Overall | 3 | Edons, M (Mihandro) | 2 | 1 | 1 | Cape Winelands Open 2025 (U10) | De Villiers PS 2025 (U10 Boys+Girls) | Details |
| Overall | 4 | Snyman, J (Jovanni) | 2 | 2 | 0 | Brave Knights Rapid 2025 (U9) | De Villiers PS 2025 (U10 Boys+Girls) | Details |
| Overall | 5 | Pekeer, C (Charlotte) | 2 | 1 | 1 | Overberg Schools Primary School Trials (Region 1) 2026 (U11 Girls) | Overberg Schools Primary School Closed 2026 (U11 Girls) | Details |
| Standard | 1 | Klopper, E (Elbe) | 2 | 1 | 1 | Western Cape Schools Individual Championship 2025 (U9 Girls) | 2025 Mzansi Inter Provincial Team Championships (U10 Combined) | Details |
| Rapid | 1 | Van Der Westhuizen, E (Erin) | 2 | 0 | 2 | Overberg Schools - PS Trials (Region 1) 2025 (U9 Girls) | Overberg Schools Primary School Trials (Region 1) 2026 (U11 Girls) | Details |
| Rapid | 2 | Beukes, B (Benjamin) | 2 | 2 | 0 | Kingsway Chess Open 2025 (U10) | UCT Open Chess Championship 2025 (U10) | Details |
| Rapid | 3 | Stevens, L (Legion) | 2 | 1 | 1 | Brave Knights Rapid 2025 (U9) | De Villiers PS 2025 (U10 Boys+Girls) | Details |
| Rapid | 4 | Snyman, J (Jovanni) | 2 | 2 | 0 | Brave Knights Rapid 2025 (U9) | De Villiers PS 2025 (U10 Boys+Girls) | Details |
| Rapid | 5 | Marais, J (Janli) | 2 | 2 | 0 | Overberg Schools - PS Trials (Region 1) 2025 (U9 Girls) | Overberg Schools Primary School Trials (Region 1) 2026 (U11 Girls) | Details |