PLAYER PAGE
Personal
Erasmus, S (Sonja)
Chess SA id
2150156373FIDE id
?Date of birth
2015-02-06 (U12)Gender
FemaleRegion
West Rand (GWR)Citizen
RSATitles
Chess SA registered
NoLast active game
2025-10-18Personal details last changed
1900-01-01Junior GPX Games
69Junior GPX Points
1289.8| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| Rating | 1410.7 | 1413.6 | 1200 | 1200 |
| Raw rating | 1367.9 | 1379 | 1200 | 1200 |
| Weighted rating | 1341.6 | 1344.3 | 1200 | 1200 |
| Weighted performance | 1410.7 | 1413.6 | 0 | 0 |
| Floor | 911.7 | 930.8 | 700 | 700 |
| K-factor | 32 | 32 | 36 | 36 |
| Min/Max rating change allowed | 130.5 | 128.5 | 165.8 | 165.8 |
| Highest rating | 1457.82025-09-30 | 1460.22025-09-30 | 12002018-10-01 | 12002018-10-01 |
| Highest raw rating | 1411.72025-09-30 | 1430.82025-09-30 | 12002024-02-01 | 12002024-02-01 |
| Highest weighted rating | 1377.42025-04-01 | 1375.72025-04-01 | 12002018-10-01 | 12002018-10-01 |
| Highest weighted performance | 1457.82025-09-30 | 1460.22025-09-30 | 12002024-02-01 | 12002024-02-01 |
| Prediction | ||||
|---|---|---|---|---|
| Item | Main | Standard | Rapid | Blitz |
| Rating change | -8.4 | -8.4 | 0 | 0 |
| New rating | 1402.3 | 1405.2 | 1200 | 1200 |
| Analysis | ||||
| Rating | 1410.7 | 1413.6 | 1200 | 1200 |
| Raw rating | 1367.9 | 1379 | 1200 | 1200 |
| Weighted rating | 1341.6 | 1344.3 | 1200 | |
| Weighted performance | 1410.7 | 1413.6 | 0 | |
| K-factor | 32 | 32 | 36 | 36 |
| Floor | 911.7 | 930.8 | 700 | 700 |
| Max/Min rating change allowed | 130.5 | 128.5 | 165.8 | 165.8 |
| Games | 0 | 0 | 0 | 0 |
| Score | 0 | 0 | 0 | 0 |
| Expected score | 0 | 0 | 0 | 0 |
| Score-Expected | 0 | 0 | 0 | 0 |
| Temp raw +/- | 0 | 0 | 0 | 0 |
| Final raw +/- | 0 | 0 | 0 | 0 |
| New raw rating | 1367.9 | 1379 | 1200 | 1200 |
| New weighted rating | 1345.7 | 1349.2 | 1200 | 1200 |
| New weighted performance | 1402.3 | 1405.2 | 0 | 0 |
| Temp new rating | 1402.3 | 1405.2 | 1200 | 1200 |
| Temp new rating +/- | -8.4 | -8.4 | 0 | 0 |
| Final new rating +/- | -8.4 | -8.4 | 0 | 0 |
| New rating | 1402.3 | 1405.2 | 1200 | 1200 |
| New K-factor | 32 | 32 | 36 | 36 |
| New floor | 911.7 | 930.8 | 700 | 700 |
| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | |
| 59 | 59 | 0 | 0 | |
| 54 | 54 | 0 | 0 | |
| 25 | 25 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| History | 138 | 138 | 0 | 0 |
| Games since | |||||||||||||||||
| Main113 | Standard113 | Rapid0 | Blitz0 | ||||||||||||||
| Gender | Female | ||||||||||||||||
| Age group | U12 | ||||||||||||||||
| Region | West Rand (GWR) | ||||||||||||||||
| Province | Gauteng (GT) | ||||||||||||||||
| Main | RSA | Province | Region | ||||||||||||||
| Overall | 2069 | 731 | 54 | ||||||||||||||
| Female | 341 | 130 | 12 | ||||||||||||||
| U12 | 265 | 98 | 11 | ||||||||||||||
| U12 Female | 72 | 31 | 5 | ||||||||||||||
| Standard | RSA | Province | Region | ||||||||||||||
| Overall | 1947 | 716 | 61 | ||||||||||||||
| Female | 329 | 125 | 12 | ||||||||||||||
| U12 | 250 | 95 | 11 | ||||||||||||||
| U12 Female | 69 | 32 | 5 | ||||||||||||||
| Rapid | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U12 | -1 | -1 | -1 | ||||||||||||||
| U12 Female | -1 | -1 | -1 | ||||||||||||||
| Blitz | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U12 | -1 | -1 | -1 | ||||||||||||||
| U12 Female | -1 | -1 | -1 | ||||||||||||||
| Games | Score | % | Dp | AvgOpp | Performance | |
| Main | 0 | 0 | 0 | 0 | 0 | 0 |
| Standard | 0 | 0 | 0 | 0 | 0 | 0 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| Games | Score | % | Dp | AvgOpp | Performance | |
| Main | 59 | 35 | 59.32 | 79.2 | 1258.5 | 1337.7 |
| Standard | 59 | 35 | 59.32 | 79.2 | 1258.5 | 1337.7 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| History | ||||||
| Games | Score | % | Dp | AvgOpp | Performance | |
| Main | 138 | 79.5 | 57.61 | 64.7 | 1260 | 1324.6 |
| Standard | 138 | 79.5 | 57.61 | 64.7 | 1260 | 1324.6 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| Date | Main | Standard | Rapid | Blitz |
| 2025-11-01 | 1367.9 | 1379 | 1200 | 1200 |
| 2025-09-30 | 1411.7 | 1430.8 | 1200 | 1200 |
| 2025-09-01 | 1383 | 1397 | 1200 | 1200 |
| 2025-08-01 | 1349.6 | 1355.8 | 1200 | 1200 |
| 2025-07-01 | 1320.5 | 1320.3 | 1200 | 1200 |
| 2025-06-01 | 1313.3 | 1311.5 | 1200 | 1200 |
| 2025-05-01 | 1308.7 | 1307.3 | 1200 | 1200 |
| 2025-04-01 | 1332.5 | 1334.8 | 1200 | 1200 |
| 2025-03-01 | 1305.4 | 1302.8 | 1200 | 1200 |
| 2025-02-01 | 1351.9 | 1348.7 | 1200 | 1200 |
| 2025-01-01 | 1351.9 | 1348.7 | 1200 | 1200 |
| 2024-12-01 | 1351.9 | 1348.7 | 1200 | 1200 |
| 2024-11-01 | 1351.9 | 1348.7 | 1200 | 1200 |
| 2024-10-01 | 1363.3 | 1360.2 | 1200 | 1200 |
| 2024-09-01 | 1349.9 | 1343.3 | 1200 | 1200 |
| 2024-08-01 | 1377.4 | 1375.7 | 1200 | 1200 |
| 2024-07-01 | 1337.2 | 1335.7 | 1200 | 1200 |
| 2024-09-01 | 1320.3 | 1317.2 | 1200 | 1200 |
| 2024-05-01 | 1312.5 | 1309.1 | 1200 | 1200 |
| 2024-04-01 | 1261.8 | 1276.5 | 1200 | 1200 |
| 2024-03-01 | 1217.3 | 1225 | 1200 | 1200 |
| 2024-02-01 | 1151.3 | 1143.6 | 1200 | 1200 |
| 2024-01-01 | 1207.5 | 1202.3 | 1200 | 1200 |
| 2023-12-01 | 1207.5 | 1202.3 | 1200 | 1200 |
Comming soon.
Tournaments
| # | Tournament | Start | End | Type | Host | Rounds | Games | Score | Cfr | Analysis |
|---|
| # | Tournament | Start | End | Type | Host | Rounds | Games | Score | Cfr | Analysis |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2025 Gauteng Top Schools Teams (U11) | 2025-08-29 | 2025-08-29 | Standard | Tshwane (GTP) | 5 | 5 | 2 | Yes | Analysis |
| 2 | West Rand Closed 2025 (U12) | 2025-10-18 | 2025-10-18 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 3 | West Rand Trials 2025 (U12) | 2025-09-06 | 2025-09-06 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 4 | West Rand Women's Day Open 2025 (U12) | 2025-08-09 | 2025-08-09 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 5 | 2025 D2 Schools League Finals (U11) | 2025-07-26 | 2025-07-26 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 6 | West Rand Open 2.0 2025 (U12) | 2025-06-07 | 2025-06-07 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 7 | 2025 D2 Schools Individuals (U11 Girls) | 2025-05-09 | 2025-05-09 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 8 | FIDE in The West 2025 (U12) | 2025-04-12 | 2025-04-12 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 9 | South African Junior Closed Chess Championships 2025 (U10 Girls) | 2025-03-31 | 2025-04-05 | Standard | Cape Winelands (WCW) | 9 | 9 | 3 | Yes | Analysis |
| 10 | West Rand Juniors 2025 (U12) | 2025-03-08 | 2025-03-08 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 11 | 2025 West Rand Open (U12) | 2025-02-08 | 2025-02-08 | Standard | West Rand (GWR) | 5 | 5 | 2 | Yes | Analysis |
Last 500 tournaments since 01 January 2018
| # | Tournament | Start | End | Type | Host | Rounds | Games | Score | Cfr | Analysis |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2025 Gauteng Top Schools Teams (U11) | 2025-08-29 | 2025-08-29 | Standard | Tshwane (GTP) | 5 | 5 | 2 | Yes | Analysis |
| 2 | West Rand Closed 2025 (U12) | 2025-10-18 | 2025-10-18 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 3 | West Rand Trials 2025 (U12) | 2025-09-06 | 2025-09-06 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 4 | West Rand Women's Day Open 2025 (U12) | 2025-08-09 | 2025-08-09 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 5 | 2025 D2 Schools League Finals (U11) | 2025-07-26 | 2025-07-26 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 6 | West Rand Open 2.0 2025 (U12) | 2025-06-07 | 2025-06-07 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 7 | 2025 D2 Schools Individuals (U11 Girls) | 2025-05-09 | 2025-05-09 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 8 | FIDE in The West 2025 (U12) | 2025-04-12 | 2025-04-12 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 9 | South African Junior Closed Chess Championships 2025 (U10 Girls) | 2025-03-31 | 2025-04-05 | Standard | Cape Winelands (WCW) | 9 | 9 | 3 | Yes | Analysis |
| 10 | West Rand Juniors 2025 (U12) | 2025-03-08 | 2025-03-08 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 11 | 2025 West Rand Open (U12) | 2025-02-08 | 2025-02-08 | Standard | West Rand (GWR) | 5 | 5 | 2 | Yes | Analysis |
| 12 | 2024 West Rand Closed (U10) | 2024-10-12 | 2024-10-12 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 13 | Gauteng Top Schools 2024 (U9 Open) | 2024-10-04 | 2024-10-04 | Standard | Ekurhuleni (GE) | 5 | 5 | 3 | Yes | Analysis |
| 14 | 2024 West Rand Trials (U10) | 2024-09-07 | 2024-09-07 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 15 | 2024 West Rand Rappies Open (U10) | 2024-08-03 | 2024-08-03 | Standard | West Rand (GWR) | 5 | 5 | 2 | Yes | Analysis |
| 16 | D2 School League Finals 2024 (U9) | 2024-07-20 | 2024-07-20 | Standard | West Rand (GWR) | 5 | 5 | 4.5 | Yes | Analysis |
| 17 | FIDE in the West 2024 (U10) | 2024-06-08 | 2024-06-08 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 18 | 2024 D2 Schools Individuals (U9) | 2024-05-04 | 2024-05-04 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 19 | 2024 West Rand RHS Open (U10) | 2024-04-13 | 2024-04-13 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 20 | 2024 West Rand Juniors (U10) | 2024-03-09 | 2024-03-09 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 21 | 2024 West Rand Open (U10) | 2024-02-03 | 2024-02-03 | Standard | West Rand (GWR) | 5 | 5 | 4 | Yes | Analysis |
| 22 | 2024 Gauteng Inter-Region Chess Championship (U10B) | 2024-01-13 | 2024-01-14 | Standard | Tshwane (GTP) | 5 | 4 | 0 | Yes | Analysis |
| 23 | West Rand vs Bojanala Inter-Regional Championships 2023 (U10) | 2023-10-14 | 2023-10-14 | Standard | West Rand (GWR) | 5 | 5 | 0 | Yes | Analysis |
| 24 | 2023 West Rand Trials (U10) | 2023-09-09 | 2023-09-09 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 25 | West Rand at Bastion 2023 (U10) | 2023-08-05 | 2023-08-05 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 26 | 2023 West Rand RHS Open (U10) | 2023-06-10 | 2023-06-10 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
| 27 | D2 Schools Individuals 2023 (U9 Boys+Girls) | 2023-05-13 | 2023-05-13 | Standard | West Rand (GWR) | 5 | 5 | 3 | Yes | Analysis |
Top 3 Streaks
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 8 | TournamentFIDE in the West 2024 | Tournament2024 West Rand Rappies Open | ||||||
| date2024-06-08 | rnd4 | typeStandard | result1 | date2024-08-03 | rnd1 | typeStandard | result1 | ||
| OpponentKraft, L (Logan) | OpponentOldjohn, L (Lazola) | ||||||||
| 2 | 6 | Tournament2025 D2 Schools League Finals | TournamentWest Rand Women's Day Open 2025 | ||||||
| date2025-07-26 | rnd2 | typeStandard | result1 | date2025-08-09 | rnd2 | typeStandard | result1 | ||
| OpponentMchunu, L (Langa Sinenhlanhla) | OpponentCrouse, R (Ruan) | ||||||||
| 3 | 5 | Tournament2023 West Rand RHS Open | TournamentWest Rand at Bastion 2023 | ||||||
| date2023-06-10 | rnd4 | typeStandard | result1 | date2023-08-05 | rnd3 | typeStandard | result1 | ||
| OpponentNinham, G (Grant) | OpponentNxumalo, T (Thando Amohelang) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 8 | TournamentFIDE in the West 2024 | Tournament2024 West Rand Rappies Open | ||||||
| date2024-06-08 | rnd4 | typeStandard | result1 | date2024-08-03 | rnd1 | typeStandard | result1 | ||
| OpponentKraft, L (Logan) | OpponentOldjohn, L (Lazola) | ||||||||
| 2 | 6 | Tournament2025 D2 Schools League Finals | TournamentWest Rand Women's Day Open 2025 | ||||||
| date2025-07-26 | rnd2 | typeStandard | result1 | date2025-08-09 | rnd2 | typeStandard | result1 | ||
| OpponentMchunu, L (Langa Sinenhlanhla) | OpponentCrouse, R (Ruan) | ||||||||
| 3 | 5 | Tournament2023 West Rand RHS Open | TournamentWest Rand at Bastion 2023 | ||||||
| date2023-06-10 | rnd4 | typeStandard | result1 | date2023-08-05 | rnd3 | typeStandard | result1 | ||
| OpponentNinham, G (Grant) | OpponentNxumalo, T (Thando Amohelang) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 6 | Tournament2025 D2 Schools League Finals | TournamentWest Rand Women's Day Open 2025 | ||||||
| date2025-07-26 | rnd2 | typeStandard | result1 | date2025-08-09 | rnd2 | typeStandard | result1 | ||
| OpponentMchunu, L (Langa Sinenhlanhla) | OpponentCrouse, R (Ruan) | ||||||||
| 2 | 5 | TournamentD2 School League Finals 2024 | Tournament2024 West Rand Rappies Open | ||||||
| date2024-07-20 | rnd2 | typeStandard | result1 | date2024-08-03 | rnd1 | typeStandard | result1 | ||
| OpponentNtokwe, T (Tshepiso) | OpponentOldjohn, L (Lazola) | ||||||||
| 3 | 5 | Tournament2023 West Rand RHS Open | TournamentWest Rand at Bastion 2023 | ||||||
| date2023-06-10 | rnd4 | typeStandard | result1 | date2023-08-05 | rnd3 | typeStandard | result1 | ||
| OpponentNinham, G (Grant) | OpponentNxumalo, T (Thando Amohelang) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 6 | Tournament2025 D2 Schools League Finals | TournamentWest Rand Women's Day Open 2025 | ||||||
| date2025-07-26 | rnd2 | typeStandard | result1 | date2025-08-09 | rnd2 | typeStandard | result1 | ||
| OpponentMchunu, L (Langa Sinenhlanhla) | OpponentCrouse, R (Ruan) | ||||||||
| 2 | 5 | TournamentD2 School League Finals 2024 | Tournament2024 West Rand Rappies Open | ||||||
| date2024-07-20 | rnd2 | typeStandard | result1 | date2024-08-03 | rnd1 | typeStandard | result1 | ||
| OpponentNtokwe, T (Tshepiso) | OpponentOldjohn, L (Lazola) | ||||||||
| 3 | 5 | Tournament2023 West Rand RHS Open | TournamentWest Rand at Bastion 2023 | ||||||
| date2023-06-10 | rnd4 | typeStandard | result1 | date2023-08-05 | rnd3 | typeStandard | result1 | ||
| OpponentNinham, G (Grant) | OpponentNxumalo, T (Thando Amohelang) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
Top 10 opponents most often played
| # | Opponent | Main | Standard | Rapid | Blitz | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Gms | Score | Dp | Gms | Score | Dp | Gms | Score | Dp | Gms | Score | Dp | ||
| Aor | Prat | Aor | Prat | Aor | Prat | Aor | Prat | ||||||
| 1 | Mangqayi ,B (Busisiwe) | 4 | 2 | 0 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1226.7 | 1226.7 | 1225.1 | 1226.7 | 0 | 0 | 0 | 0 | ||||||
| 2 | Laubscher ,D (Declan) | 4 | 3 | 212.5 | 4 | 3 | 212.5 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1228.9 | 1441.4 | 1227.6 | 1441.4 | 0 | 0 | 0 | 0 | ||||||
| 3 | Haasbroek ,Z (Zandre) | 4 | 4 | 425 | 4 | 4 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1202.8 | 1627.8 | 1202.8 | 1627.8 | 0 | 0 | 0 | 0 | ||||||
| 4 | Ninham ,G (Grant) | 4 | 3 | 212.5 | 4 | 3 | 212.5 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1193 | 1405.5 | 1191.7 | 1405.5 | 0 | 0 | 0 | 0 | ||||||
| 5 | White ,J (Joshua) | 3 | 1 | -141.7 | 3 | 1 | -141.7 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1335.5 | 1193.9 | 1337 | 1193.9 | 0 | 0 | 0 | 0 | ||||||
| 6 | Botha ,AZ (Adriaan Zander) | 3 | 0 | -425 | 3 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1532 | 1107 | 1530.4 | 1107 | 0 | 0 | 0 | 0 | ||||||
| 7 | Oldjohn ,L (Lazola) | 3 | 3 | 425 | 3 | 3 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1163.3 | 1588.3 | 1154.8 | 1588.3 | 0 | 0 | 0 | 0 | ||||||
| 8 | Folscher ,E (Ethan) | 3 | 2 | 141.7 | 3 | 2 | 141.7 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1195.7 | 1337.4 | 1195.5 | 1337.4 | 0 | 0 | 0 | 0 | ||||||
| 9 | Schutte ,CB (Christiaan Benjamin) | 3 | 0 | -425 | 3 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1350.8 | 925.8 | 1359.1 | 925.8 | 0 | 0 | 0 | 0 | ||||||
| 10 | Van Der Merwe ,J (Jayden) | 3 | 1 | -141.7 | 3 | 1 | -141.7 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1306.6 | 1165 | 1304 | 1165 | 0 | 0 | 0 | 0 | ||||||
Norms
| # | Norm | Tournament | Start | End | Rounds | Games | Score | Details |
|---|---|---|---|---|---|---|---|---|