PLAYER PAGE
Sonja Erasmus
2150156373West Rand (GWR)Personal
Main rating
| Rating | 1342.6 |
| K-factor | 32 |
| Floor | 911.7 |
| Highest | 1457.8 (2025-09-30) |
| Min/Max +/- allowed | 115 |
| Rating Change () | |
| Games | 8 |
| Score | 4.5 |
| We | 5.27 |
| SWe | -0.62 |
| Temp +/- | -20 |
| Penalties | 0 |
| Weight perform | 1294.2 |
| Final +/- | -20 |
| New Rating () | |
| Rating | 1322.6 |
| K-factor | 32 |
| Floor | 911.7 |
| Highest | 1457.8 (2025-09-30) |
| Min/Max +/- allowed | 114.8 |
Standard rating
| Rating | 1344.1 |
| K-factor | 32 |
| Floor | 930.8 |
| Highest | 1460.2 (2025-09-30) |
| Min/Max +/- allowed | 114.5 |
| Rating Change () | |
| Games | 5 |
| Score | 2.5 |
| We | 3.04 |
| SWe | -0.54 |
| Temp +/- | -17.2 |
| Penalties | 0 |
| Weight perform | 1294.2 |
| Final +/- | -17.2 |
| New Rating () | |
| Rating | 1326.9 |
| K-factor | 32 |
| Floor | 930.8 |
| Highest | 1460.2 (2025-09-30) |
| Min/Max +/- allowed | 114.5 |
Rapid rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
| Rating Change () | |
| Games | 3 |
| Score | 2 |
| We | 2.35 |
| SWe | -0.36 |
| Temp +/- | -12.9 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | -12.9 |
| New Rating () | |
| Rating | 1187.1 |
| 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 | Gauteng Closed Chess Championships 2026 (U12 Girls) | Standard | 2026-10-17 | 2026-10-17 | Ekurhuleni (GE) | 5 | 1342.6 | 5 | 2.5 | 1258.8 | -14.1 | Details |
| 2 | Gauteng Top Schools Teams 2026 (U11) | Rapid | 2026-08-28 | 2026-08-28 | Ekurhuleni (GE) | 5 | 1342.6 | 3 | 2 | 1181.4 | -5.8 | Details |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | West Rand Trials 2026 (U12) | Standard | 2026-09-05 | 2026-09-05 | West Rand (GWR) | 5 | 1330.1 | 5 | 3 | 1402.7 | 12.5 | Details |
| 2 | 2026 D2 Schools League Finals (U11) | Standard | 2026-08-15 | 2026-08-15 | West Rand (GWR) | 5 | 1330.1 | 4 | 3 | 1351.8 | 5.6 | Details |
| 3 | 2026 D2 Top 20 Schools Individuals (U11 Girls) | Standard | 2026-07-25 | 2026-07-25 | West Rand (GWR) | 5 | 1355.2 | 5 | 2 | 1164.8 | -30.7 | Details |
| 4 | 2026 D2 Schools Individuals (U11 Girls) | Standard | 2026-05-15 | 2026-05-16 | West Rand (GWR) | 5 | 1348.7 | 5 | 4 | 1437 | 15.2 | Details |
| 5 | West Rand goes to Monnas 2026 (U12) | Standard | 2026-05-02 | 2026-05-02 | West Rand (GWR) | 5 | 1348.7 | 5 | 2 | 1286.5 | -8.6 | Details |
| 6 | FIDE in the West 2026 (U12) | Standard | 2026-04-11 | 2026-04-11 | West Rand (GWR) | 5 | 1335.4 | 5 | 3 | 1430.1 | 13.3 | Details |
| 7 | West Rand Juniors 2026 (U12) | Standard | 2026-03-07 | 2026-03-07 | West Rand (GWR) | 5 | 1343.9 | 5 | 2.5 | 1281.5 | -8.5 | Details |
| 8 | West Rand Open 2026 (U12) | Standard | 2026-02-07 | 2026-02-07 | West Rand (GWR) | 5 | 1346.1 | 5 | 2 | 1210.1 | -12.4 | Details |
| 9 | Gauteng Inter-Region at Emerald Resort 2025 (U12 Girls) | Standard | 2025-12-06 | 2025-12-07 | Sedibeng (GSV) | 5 | 1396 | 4 | 1 | 1115.1 | -24.8 | Details |
| 10 | 2025 Gauteng Top Schools Teams (U11) | Standard | 2025-08-29 | 2025-08-29 | Tshwane (GTP) | 5 | 1457.4 | 5 | 2 | 1231.9 | -22.4 | Details |
| 11 | West Rand Closed 2025 (U12) | Standard | 2025-10-18 | 2025-10-18 | West Rand (GWR) | 5 | 1457.4 | 5 | 3 | 1413.7 | -4.8 | Details |
| 12 | West Rand Trials 2025 (U12) | Standard | 2025-09-06 | 2025-09-06 | West Rand (GWR) | 5 | 1400.4 | 5 | 4 | 1556.6 | 16.1 | Details |
| 13 | West Rand Women's Day Open 2025 (U12) | Standard | 2025-08-09 | 2025-08-09 | West Rand (GWR) | 5 | 1349.6 | 5 | 4 | 1531.9 | 18.6 | Details |
| 14 | 2025 D2 Schools League Finals (U11) | Standard | 2025-07-26 | 2025-07-26 | West Rand (GWR) | 5 | 1320.5 | 5 | 4 | 1478.2 | 16.3 | Details |
| 15 | West Rand Open 2.0 2025 (U12) | Standard | 2025-06-07 | 2025-06-07 | West Rand (GWR) | 5 | 1313.3 | 5 | 3 | 1346.5 | 4 | Details |
| 16 | 2025 D2 Schools Individuals (U11 Girls) | Standard | 2025-05-09 | 2025-05-09 | West Rand (GWR) | 5 | 1308.7 | 5 | 3 | 1271.6 | -4.1 | Details |
| 17 | FIDE in The West 2025 (U12) | Standard | 2025-04-12 | 2025-04-12 | West Rand (GWR) | 5 | 1332.5 | 5 | 3 | 1266.9 | -7 | Details |
| 18 | South African Junior Closed Chess Championships 2025 (U10 Girls) | Classical | 2025-03-31 | 2025-04-05 | Cape Winelands (WCW) | 9 | 1332.5 | 9 | 3 | 1197.8 | -29.4 | Details |
| 19 | West Rand Juniors 2025 (U12) | Standard | 2025-03-08 | 2025-03-08 | West Rand (GWR) | 5 | 1305.4 | 5 | 4 | 1465.7 | 15.1 | Details |
| 20 | 2025 West Rand Open (U12) | Standard | 2025-02-08 | 2025-02-08 | West Rand (GWR) | 5 | 1351.9 | 5 | 2 | 1065.8 | -27.1 | Details |
| 21 | 2024 West Rand Closed (U10) | Standard | 2024-10-12 | 2024-10-12 | West Rand (GWR) | 5 | 1363.3 | 5 | 3 | 1369.2 | -0.2 | Details |
| 22 | Gauteng Top Schools 2024 (U9 Open) | Standard | 2024-10-04 | 2024-10-04 | Ekurhuleni (GE) | 5 | 1363.3 | 5 | 3 | 1307.7 | -6.1 | Details |
| 23 | 2024 West Rand Trials (U10) | Standard | 2024-09-07 | 2024-09-07 | West Rand (GWR) | 5 | 1349.9 | 5 | 3 | 1432.2 | 7.5 | Details |
| 24 | 2024 West Rand Rappies Open (U10) | Standard | 2024-08-03 | 2024-08-03 | West Rand (GWR) | 5 | 1377.4 | 5 | 2 | 1213.9 | -15.3 | Details |
| 25 | D2 School League Finals 2024 (U9) | Standard | 2024-07-20 | 2024-07-20 | West Rand (GWR) | 5 | 1337.2 | 5 | 4.5 | 1518.2 | 18.6 | Details |
| 26 | FIDE in the West 2024 (U10) | Standard | 2024-06-08 | 2024-06-08 | West Rand (GWR) | 5 | 1320.3 | 5 | 3 | 1357.8 | 4.5 | Details |
| 27 | 2024 D2 Schools Individuals (U9) | Standard | 2024-05-04 | 2024-05-04 | West Rand (GWR) | 5 | 1312.5 | 5 | 3 | 1273.2 | -2.8 | Details |
| 28 | 2024 West Rand RHS Open (U10) | Standard | 2024-04-13 | 2024-04-13 | West Rand (GWR) | 5 | 1261.8 | 5 | 3 | 1390.1 | 11.8 | Details |
| 29 | 2024 West Rand Juniors (U10) | Standard | 2024-03-09 | 2024-03-09 | West Rand (GWR) | 5 | 1217.3 | 5 | 4 | 1464.9 | 24.7 | Details |
| 30 | 2024 West Rand Open (U10) | Standard | 2024-02-03 | 2024-02-03 | West Rand (GWR) | 5 | 1151.3 | 5 | 4 | 1536.4 | 36.9 | Details |
| 31 | 2024 Gauteng Inter-Region Chess Championship (U10B) | Standard | 2024-01-13 | 2024-01-14 | Tshwane (GTP) | 5 | 1207.5 | 4 | 0 | 857.6 | -31.1 | Details |
| 32 | West Rand vs Bojanala Inter-Regional Championships 2023 (U10) | Standard | 2023-10-14 | 2023-10-14 | West Rand (GWR) | 5 | 1260.1 | 5 | 0 | 970.2 | -29.2 | Details |
| 33 | 2023 West Rand Trials (U10) | Standard | 2023-09-09 | 2023-09-09 | West Rand (GWR) | 5 | 1256.8 | 5 | 3 | 1279.9 | 1.7 | Details |
| 34 | West Rand at Bastion 2023 (U10) | Standard | 2023-08-05 | 2023-08-05 | West Rand (GWR) | 5 | 1235.6 | 5 | 3 | 1362 | 11.6 | Details |
| 35 | 2023 West Rand RHS Open (U10) | Standard | 2023-06-10 | 2023-06-10 | West Rand (GWR) | 5 | 1224.5 | 5 | 3 | 1279.1 | 6 | Details |
| 36 | D2 Schools Individuals 2023 (U9 Boys+Girls) | Standard | 2023-05-13 | 2023-05-13 | West Rand (GWR) | 5 | 1200 | 5 | 3 | 1334.2 | 13.8 | Details |
Game statistics ( )
| Games | 5 |
| Wins | 2 |
| Draws | 1 |
| Losses | 2 |
| White | 3 |
| Black | 2 |
| White wins | 1 |
| Black wins | 1 |
| Score | 2.5 |
| Percent | 50 |
| Dp | 0 |
| AOR | 1258.8 |
| Performance | 1258.8 |
Game statistics ()
| Games | 47 |
| Wins | 25 |
| Draws | 2 |
| Losses | 20 |
| White | 24 |
| Black | 23 |
| White wins | 13 |
| Black wins | 12 |
| Score | 26 |
| Percent | 55.3 |
| Dp | 45.2 |
| AOR | 1259.2 |
| Performance | 1304.5 |
Game statistics (History)
| Games | 189 |
| Wins | 105 |
| Draws | 3 |
| Losses | 81 |
| White | 96 |
| Black | 93 |
| White wins | 52 |
| Black wins | 53 |
| Score | 106.5 |
| Percent | 56.3 |
| Dp | 54 |
| AOR | 1261.2 |
| Performance | 1315.2 |
Rankings (Main)
| National | |
| Overall | 4881 |
| Gender | 825 |
| Age group | 497 |
| Gender/Age | 114 |
| Provincial | |
| Overall | 1648 |
| Gender | 274 |
| Age group | 173 |
| Gender/Age | 34 |
| Regional | |
| Overall | 131 |
| Gender | 23 |
| Age group | 22 |
| Gender/Age | 5 |
Rankings (Standard)
| National | |
| Overall | 4284 |
| Gender | 754 |
| Age group | 450 |
| Gender/Age | 103 |
| Provincial | |
| Overall | 1529 |
| Gender | 253 |
| Age group | 162 |
| Gender/Age | 28 |
| Regional | |
| Overall | 138 |
| Gender | 23 |
| Age group | 24 |
| Gender/Age | 5 |
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 | 2.5 |
| Percent | 50 |
| Aor | 1258.8 |
| Dp | 0 |
| Prat | 1258.8 |
Performance ()
| Games | 47 |
| Score | 26 |
| Percent | 55.3 |
| Aor | 1259.2 |
| Dp | 45.2 |
| Prat | 1304.5 |
Performance (12 months)
| Games | 51 |
| Score | 27 |
| Percent | 52.9 |
| Aor | 1264.6 |
| Dp | 25 |
| Prat | 1289.6 |
Performance (History)
| Games | 189 |
| Score | 106.5 |
| Percent | 56.3 |
| Aor | 1261.2 |
| Dp | 54 |
| Prat | 1315.2 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Laubscher, D (Declan) | 6 | 4 | 2 | 2024 West Rand Rappies Open (U10) | 2026 D2 Schools League Finals (U11) | Details |
| Overall | 2 | Ninham, G (Grant) | 6 | 4 | 2 | 2023 West Rand RHS Open (U10) | West Rand Trials 2026 (U12) | Details |
| Overall | 3 | Van Der Merwe, J (Jayden) | 5 | 3 | 2 | 2024 West Rand RHS Open (U10) | West Rand goes to Monnas 2026 (U12) | Details |
| Overall | 4 | Kamffer, J (John-Andrew) | 4 | 2 | 2 | 2024 D2 Schools Individuals (U9) | West Rand goes to Monnas 2026 (U12) | Details |
| Overall | 5 | Mangqayi, B (Busisiwe) | 4 | 0 | 4 | 2023 West Rand RHS Open (U10) | 2025 D2 Schools League Finals (U11) | Details |
| Standard | 1 | Laubscher, D (Declan) | 6 | 4 | 2 | 2024 West Rand Rappies Open (U10) | 2026 D2 Schools League Finals (U11) | Details |
| Standard | 2 | Ninham, G (Grant) | 6 | 4 | 2 | 2023 West Rand RHS Open (U10) | West Rand Trials 2026 (U12) | Details |
| Standard | 3 | Van Der Merwe, J (Jayden) | 5 | 3 | 2 | 2024 West Rand RHS Open (U10) | West Rand goes to Monnas 2026 (U12) | Details |
| Standard | 4 | Kamffer, J (John-Andrew) | 4 | 2 | 2 | 2024 D2 Schools Individuals (U9) | West Rand goes to Monnas 2026 (U12) | Details |
| Standard | 5 | Mangqayi, B (Busisiwe) | 4 | 0 | 4 | 2023 West Rand RHS Open (U10) | 2025 D2 Schools League Finals (U11) | Details |