PLAYER PAGE
Personal
De Klerk, J (Jana)
Chess SA id
2080149071FIDE id
?Date of birth
2008-05-19 (U18)Gender
FemaleRegion
Tshwane (GTP)Citizen
RSATitles
Chess SA registered
NoLast active game
2025-01-25Personal details last changed
1900-01-01Junior GPX Games
Junior GPX Points
| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| Rating | 1107.5 | 1095.9 | 1200 | 1200 |
| Raw rating | 1106.7 | 1094.9 | 1200 | 1200 |
| Weighted rating | 1107.5 | 1095.9 | 1200 | 1200 |
| Weighted performance | 914.9 | 913.6 | 0 | 0 |
| Floor | 700 | 700 | 700 | 700 |
| K-factor | 36 | 36 | 36 | 36 |
| Min/Max rating change allowed | 189.4 | 192.6 | 165.8 | 165.8 |
| Highest rating | 12002018-10-01 | 12002018-10-01 | 12002018-10-01 | 12002018-10-01 |
| Highest raw rating | 12002019-12-01 | 12002019-12-01 | 12002024-03-01 | 12002024-03-01 |
| Highest weighted rating | 12002018-10-01 | 12002018-10-01 | 12002018-10-01 | 12002018-10-01 |
| Highest weighted performance | 12002019-12-01 | 12002019-12-01 | 12002024-03-01 | 12002024-03-01 |
| Prediction | ||||
|---|---|---|---|---|
| Item | Main | Standard | Rapid | Blitz |
| Rating change | 0.2 | 0.3 | 0 | 0 |
| New rating | 1107.7 | 1096.2 | 1200 | 1200 |
| Analysis | ||||
| Rating | 1107.5 | 1095.9 | 1200 | 1200 |
| Raw rating | 1106.7 | 1094.9 | 1200 | 1200 |
| Weighted rating | 1107.5 | 1095.9 | 1200 | |
| Weighted performance | 914.9 | 913.6 | 0 | |
| K-factor | 36 | 36 | 36 | 36 |
| Floor | 700 | 700 | 700 | 700 |
| Max/Min rating change allowed | 189.4 | 192.6 | 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 | 1106.7 | 1094.9 | 1200 | 1200 |
| New weighted rating | 1107.7 | 1096.2 | 1200 | 1200 |
| New weighted performance | 914.5 | 913.2 | 0 | 0 |
| Temp new rating | 1107.7 | 1096.2 | 1200 | 1200 |
| Temp new rating +/- | 0.2 | 0.3 | 0 | 0 |
| Final new rating +/- | 0.2 | 0.3 | 0 | 0 |
| New rating | 1107.7 | 1096.2 | 1200 | 1200 |
| New K-factor | 36 | 36 | 36 | 36 |
| New floor | 700 | 700 | 700 | 700 |
| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | |
| 5 | 5 | 0 | 0 | |
| 13 | 13 | 0 | 0 | |
| 8 | 8 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| History | 26 | 26 | 0 | 0 |
| Games since | |||||||||||||||||
| Main18 | Standard18 | Rapid0 | Blitz0 | ||||||||||||||
| Gender | Female | ||||||||||||||||
| Age group | U18 | ||||||||||||||||
| Region | Tshwane (GTP) | ||||||||||||||||
| Province | Gauteng (GT) | ||||||||||||||||
| Main | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U18 | -1 | -1 | -1 | ||||||||||||||
| U18 Female | -1 | -1 | -1 | ||||||||||||||
| Standard | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U18 | -1 | -1 | -1 | ||||||||||||||
| U18 Female | -1 | -1 | -1 | ||||||||||||||
| Rapid | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U18 | -1 | -1 | -1 | ||||||||||||||
| U18 Female | -1 | -1 | -1 | ||||||||||||||
| Blitz | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Female | -1 | -1 | -1 | ||||||||||||||
| U18 | -1 | -1 | -1 | ||||||||||||||
| U18 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 | 5 | 2 | 40 | -85 | 1159.4 | 1074.4 |
| Standard | 5 | 2 | 40 | -85 | 1159.4 | 1074.4 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| History | ||||||
| Games | Score | % | Dp | AvgOpp | Performance | |
| Main | 26 | 7 | 26.92 | -196.2 | 1214.4 | 1018.3 |
| Standard | 26 | 7 | 26.92 | -196.2 | 1214.4 | 1018.3 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| Date | Main | Standard | Rapid | Blitz |
| 2025-09-30 | 1106.7 | 1094.9 | 1200 | 1200 |
| 2025-09-01 | 1106.7 | 1094.9 | 1200 | 1200 |
| 2025-08-01 | 1106.7 | 1094.9 | 1200 | 1200 |
| 2025-07-01 | 1106.3 | 1094.3 | 1200 | 1200 |
| 2025-06-01 | 1105.9 | 1093.7 | 1200 | 1200 |
| 2025-05-01 | 1105.7 | 1093.4 | 1200 | 1200 |
| 2025-04-01 | 1105.6 | 1093.1 | 1200 | 1200 |
| 2025-03-01 | 1105.6 | 1092.9 | 1200 | 1200 |
| 2025-02-01 | 1104.9 | 1092.4 | 1200 | 1200 |
| 2025-01-01 | 1100.8 | 1090 | 1200 | 1200 |
| 2024-12-01 | 1100.8 | 1090 | 1200 | 1200 |
| 2024-11-01 | 1100.8 | 1090 | 1200 | 1200 |
| 2024-10-01 | 1100.8 | 1090 | 1200 | 1200 |
| 2024-09-01 | 1138.6 | 1134.8 | 1200 | 1200 |
| 2024-08-01 | 1138.6 | 1134.8 | 1200 | 1200 |
| 2024-07-01 | 1138.6 | 1134.8 | 1200 | 1200 |
| 2024-06-01 | 1138.6 | 1134.8 | 1200 | 1200 |
| 2024-08-01 | 1090.8 | 1073.2 | 1200 | 1200 |
| 2024-04-01 | 1090.8 | 1073.2 | 1200 | 1200 |
| 2024-03-01 | 1090.8 | 1073.2 | 1200 | 1200 |
| 2024-02-01 | 1079.2 | 1056.8 | 1200 | 1200 |
| 2024-01-01 | 1079.2 | 1056.8 | 1200 | 1200 |
| 2023-12-01 | 1079.2 | 1056.8 | 1200 | 1200 |
| 2023-11-01 | 1079.2 | 1056.8 | 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 Tshwane Chess OPEN Registration Tournament (C) | 2025-01-25 | 2025-01-25 | Standard | Tshwane (GTP) | 5 | 5 | 2 | Yes | Analysis |
Last 500 tournaments since 01 January 2018
| # | Tournament | Start | End | Type | Host | Rounds | Games | Score | Cfr | Analysis |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 2025 Tshwane Chess OPEN Registration Tournament (C) | 2025-01-25 | 2025-01-25 | Standard | Tshwane (GTP) | 5 | 5 | 2 | Yes | Analysis |
| 2 | Gauteng Schools Individuals Finals 2024 (U18 Girls) | 2024-08-17 | 2024-08-17 | Standard | Ekurhuleni (GE) | 5 | 3 | 0 | Yes | Analysis |
| 3 | 2024 Tshwane South School District CLOSED Individual Championships (U18 Girls) | 2024-05-11 | 2024-05-11 | Standard | Tshwane (GTP) | 5 | 5 | 3 | Yes | Analysis |
| 4 | Grey College Team Championship 2024 (B) | 2024-02-23 | 2024-02-24 | Standard | Mangaung (FMB) | 5 | 5 | 2 | Yes | Analysis |
| 5 | 2023 Gauteng Top Schools (U15 Girls) | 2023-08-19 | 2023-08-19 | Standard | West Rand (GWR) | 5 | 4 | 0 | Yes | Analysis |
| 6 | Grey College Team Championship 2023 (B) | 2023-02-03 | 2023-02-04 | Standard | Mangaung (FMB) | 5 | 4 | 0 | Yes | Analysis |
Top 3 Streaks
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3 | Tournament2024 Tshwane South School District CLOSED Individual Championships | Tournament2024 Tshwane South School District CLOSED Individual Championships | ||||||
| date2024-05-11 | rnd3 | typeStandard | result1 | date2024-05-11 | rnd5 | typeStandard | result1 | ||
| OpponentMatlatla, T (Thato) | OpponentKruger, Z (Zanika) | ||||||||
| 2 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd5 | typeStandard | result1 | date2025-01-25 | rnd5 | typeStandard | result1 | ||
| OpponentDu Toit, J (Janri) | OpponentDu Toit, J (Janri) | ||||||||
| 3 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd1 | typeStandard | result1 | date2025-01-25 | rnd1 | typeStandard | result1 | ||
| OpponentMadikgetla, R (Rofhiwa) | OpponentMadikgetla, R (Rofhiwa) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3 | Tournament2024 Tshwane South School District CLOSED Individual Championships | Tournament2024 Tshwane South School District CLOSED Individual Championships | ||||||
| date2024-05-11 | rnd3 | typeStandard | result1 | date2024-05-11 | rnd5 | typeStandard | result1 | ||
| OpponentMatlatla, T (Thato) | OpponentKruger, Z (Zanika) | ||||||||
| 2 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd5 | typeStandard | result1 | date2025-01-25 | rnd5 | typeStandard | result1 | ||
| OpponentDu Toit, J (Janri) | OpponentDu Toit, J (Janri) | ||||||||
| 3 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd1 | typeStandard | result1 | date2025-01-25 | rnd1 | typeStandard | result1 | ||
| OpponentMadikgetla, R (Rofhiwa) | OpponentMadikgetla, R (Rofhiwa) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3 | Tournament2024 Tshwane South School District CLOSED Individual Championships | Tournament2024 Tshwane South School District CLOSED Individual Championships | ||||||
| date2024-05-11 | rnd3 | typeStandard | result1 | date2024-05-11 | rnd5 | typeStandard | result1 | ||
| OpponentMatlatla, T (Thato) | OpponentKruger, Z (Zanika) | ||||||||
| 2 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd5 | typeStandard | result1 | date2025-01-25 | rnd5 | typeStandard | result1 | ||
| OpponentDu Toit, J (Janri) | OpponentDu Toit, J (Janri) | ||||||||
| 3 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd1 | typeStandard | result1 | date2025-01-25 | rnd1 | typeStandard | result1 | ||
| OpponentMadikgetla, R (Rofhiwa) | OpponentMadikgetla, R (Rofhiwa) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3 | Tournament2024 Tshwane South School District CLOSED Individual Championships | Tournament2024 Tshwane South School District CLOSED Individual Championships | ||||||
| date2024-05-11 | rnd3 | typeStandard | result1 | date2024-05-11 | rnd5 | typeStandard | result1 | ||
| OpponentMatlatla, T (Thato) | OpponentKruger, Z (Zanika) | ||||||||
| 2 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd5 | typeStandard | result1 | date2025-01-25 | rnd5 | typeStandard | result1 | ||
| OpponentDu Toit, J (Janri) | OpponentDu Toit, J (Janri) | ||||||||
| 3 | 1 | Tournament2025 Tshwane Chess OPEN Registration Tournament | Tournament2025 Tshwane Chess OPEN Registration Tournament | ||||||
| date2025-01-25 | rnd1 | typeStandard | result1 | date2025-01-25 | rnd1 | typeStandard | result1 | ||
| OpponentMadikgetla, R (Rofhiwa) | OpponentMadikgetla, R (Rofhiwa) | ||||||||
| # | 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 | Lepati ,N (Naledi) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1175.8 | 750.8 | 1171.2 | 750.8 | 0 | 0 | 0 | 0 | ||||||
| 2 | Kwak ,J (Jaeson) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1383.7 | 958.7 | 1393.8 | 958.7 | 0 | 0 | 0 | 0 | ||||||
| 3 | Kruger ,Z (Zanika) | 1 | 1 | 425 | 1 | 1 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1200 | 1625 | 1200 | 1625 | 0 | 0 | 0 | 0 | ||||||
| 4 | Matlaila ,O (Ofentse) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1179.4 | 754.4 | 1178 | 754.4 | 0 | 0 | 0 | 0 | ||||||
| 5 | Chihereva ,L (Linqleighter) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1220.3 | 795.3 | 1222.8 | 795.3 | 0 | 0 | 0 | 0 | ||||||
| 6 | Madikgetla ,R (Rofhiwa) | 1 | 1 | 425 | 1 | 1 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1200 | 1625 | 1200 | 1625 | 0 | 0 | 0 | 0 | ||||||
| 7 | Labuscagne ,JC (Josef Cornelius) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1200 | 775 | 1200 | 775 | 0 | 0 | 0 | 0 | ||||||
| 8 | Nare ,P (Pontsho) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1200 | 775 | 1200 | 775 | 0 | 0 | 0 | 0 | ||||||
| 9 | Mashele ,N (Naledi) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1098.7 | 673.7 | 1094 | 673.7 | 0 | 0 | 0 | 0 | ||||||
| 10 | Oberholster ,G (Guilliaume Albertus J) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1253.4 | 828.4 | 1260.1 | 828.4 | 0 | 0 | 0 | 0 | ||||||
Norms
| # | Norm | Tournament | Start | End | Rounds | Games | Score | Details |
|---|---|---|---|---|---|---|---|---|