PLAYER PAGE
Personal
Da Costa, E (Ethan)
Chess SA id
1120306437FIDE id
?Date of birth
2012-02-17 (U16)Gender
MaleRegion
Tshwane (GTP)Citizen
RSATitles
Chess SA registered
YesLast active game
2025-12-07Personal details last changed
1900-01-01Junior GPX Games
Junior GPX Points
| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| Rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Raw rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Weighted rating | 1263.7 | 1255.2 | 1200 | 1200 |
| Weighted performance | 1191.4 | 1189 | 0 | 0 |
| Floor | 831.2 | 825.3 | 700 | 700 |
| K-factor | 36 | 36 | 36 | 36 |
| Min/Max rating change allowed | 149.3 | 151.7 | 165.8 | 165.8 |
| Highest rating | 1331.22025-04-01 | 1325.32025-04-01 | 12002024-12-01 | 12002024-12-01 |
| Highest raw rating | 1331.22025-04-01 | 1325.32025-04-01 | 12002024-12-01 | 12002024-12-01 |
| Highest weighted rating | 1331.22024-12-01 | 1325.32024-12-01 | 12002024-12-01 | 12002024-12-01 |
| Highest weighted performance | 1331.22025-04-01 | 1325.32024-11-01 | 12002024-12-01 | 12002024-12-01 |
| Prediction | ||||
|---|---|---|---|---|
| Item | Main | Standard | Rapid | Blitz |
| Rating change | 0 | 0 | 0 | 0 |
| New rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Analysis | ||||
| Rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Raw rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Weighted rating | 1263.7 | 1255.2 | 1200 | |
| Weighted performance | 1191.4 | 1189 | 0 | |
| K-factor | 36 | 36 | 36 | 36 |
| Floor | 831.2 | 825.3 | 700 | 700 |
| Max/Min rating change allowed | 149.3 | 151.7 | 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 | 1273.8 | 1262.6 | 1200 | 1200 |
| New weighted rating | 1266.4 | 1257.6 | 1200 | 1200 |
| New weighted performance | 1183.4 | 1180.9 | 0 | 0 |
| Temp new rating | 1273.8 | 1262.6 | 1200 | 1200 |
| Temp new rating +/- | 0 | 0 | 0 | 0 |
| Final new rating +/- | 0 | 0 | 0 | 0 |
| New rating | 1273.8 | 1262.6 | 1200 | 1200 |
| New K-factor | 36 | 36 | 36 | 36 |
| New floor | 831.2 | 825.3 | 700 | 700 |
| Item | Main | Standard | Rapid | Blitz |
|---|---|---|---|---|
| 0 | 0 | 0 | 0 | |
| 32 | 32 | 0 | 0 | |
| 41 | 41 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| 0 | 0 | 0 | 0 | |
| History | 73 | 73 | 0 | 0 |
| Games since | |||||||||||||||||
| Main73 | Standard73 | Rapid0 | Blitz0 | ||||||||||||||
| Gender | Male | ||||||||||||||||
| Age group | U14 | ||||||||||||||||
| Region | Tshwane (GTP) | ||||||||||||||||
| Province | Gauteng (GT) | ||||||||||||||||
| Main | RSA | Province | Region | ||||||||||||||
| Overall | 3543 | 1172 | 408 | ||||||||||||||
| Male | 2731 | 903 | 312 | ||||||||||||||
| U14 | 676 | 220 | 73 | ||||||||||||||
| U14 Male | 484 | 154 | 54 | ||||||||||||||
| Standard | RSA | Province | Region | ||||||||||||||
| Overall | 3546 | 1271 | 481 | ||||||||||||||
| Male | 2723 | 984 | 370 | ||||||||||||||
| U14 | 678 | 239 | 85 | ||||||||||||||
| U14 Male | 474 | 165 | 57 | ||||||||||||||
| Rapid | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Male | -1 | -1 | -1 | ||||||||||||||
| U14 | -1 | -1 | -1 | ||||||||||||||
| U14 Male | -1 | -1 | -1 | ||||||||||||||
| Blitz | RSA | Province | Region | ||||||||||||||
| Overall | -1 | -1 | -1 | ||||||||||||||
| Male | -1 | -1 | -1 | ||||||||||||||
| U14 | -1 | -1 | -1 | ||||||||||||||
| U14 Male | -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 | 32 | 14 | 43.75 | -53.1 | 1348.8 | 1295.7 |
| Standard | 32 | 14 | 43.75 | -53.1 | 1348.8 | 1295.7 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| History | ||||||
| Games | Score | % | Dp | AvgOpp | Performance | |
| Main | 73 | 33.5 | 45.89 | -34.9 | 1266.9 | 1231.9 |
| Standard | 73 | 33.5 | 45.89 | -34.9 | 1266.9 | 1231.9 |
| Rapid | 0 | 0 | 0 | 0 | 0 | 0 |
| Blitz | 0 | 0 | 0 | 0 | 0 | 0 |
| Date | Main | Standard | Rapid | Blitz |
| 2026-01-01 | 1273.8 | 1262.6 | 1200 | 1200 |
| 2025-11-30 | 1271.8 | 1259.7 | 1200 | 1200 |
| 2025-11-01 | 1271.8 | 1259.7 | 1200 | 1200 |
| 2025-09-30 | 1271.8 | 1259.7 | 1200 | 1200 |
| 2025-09-01 | 1319.3 | 1314.4 | 1200 | 1200 |
| 2025-08-01 | 1306.8 | 1297.7 | 1200 | 1200 |
| 2025-07-01 | 1291 | 1276.7 | 1200 | 1200 |
| 2025-06-01 | 1291 | 1276.7 | 1200 | 1200 |
| 2025-05-01 | 1331.2 | 1325.3 | 1200 | 1200 |
| 2025-04-01 | 1331.2 | 1325.3 | 1200 | 1200 |
| 2025-03-01 | 1288.5 | 1283.7 | 1200 | 1200 |
| 2025-02-01 | 1288.5 | 1283.7 | 1200 | 1200 |
| 2025-01-01 | 1222.6 | 1217.6 | 1200 | 1200 |
| 2024-12-01 | 1215.1 | 1212.6 | 1200 | 1200 |
| 2024-11-01 | 1129.9 | 1122.4 | 1200 | 1200 |
| 2024-10-01 | 1129.9 | 1122.4 | 1200 | 1200 |
| 2024-09-01 | 1186.7 | 1182.4 | 1200 | 1200 |
| 2024-11-01 | 1133.6 | 1117.2 | 1200 | 1200 |
| 2024-07-01 | 1200 | 1200 | 1200 | 1200 |
| 2024-06-01 | 1200 | 1200 | 1200 | 1200 |
| 2024-05-01 | 1200 | 1200 | 1200 | 1200 |
| 2024-04-01 | 1200 | 1200 | 1200 | 1200 |
| 2024-03-01 | 1200 | 1200 | 1200 | 1200 |
| 2024-02-01 | 1200 | 1200 | 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 |
|---|
Last 500 tournaments since 01 January 2018
| # | Tournament | Start | End | Type | Host | Rounds | Games | Score | Cfr | Analysis |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Gauteng Inter-Region at Emerald Resort 2025 (U14 Candidates) | 2025-12-06 | 2025-12-07 | Standard | Sedibeng (GSV) | 5 | 5 | 2.5 | Yes | Analysis |
| 2 | 2025 Centurion Chess Open Tournament (C) | 2025-09-27 | 2025-09-27 | Standard | Tshwane (GTP) | 5 | 5 | 1 | Yes | Analysis |
| 3 | 2025 Etienne Lewis Closed Chess Tournament (U14) | 2025-08-08 | 2025-08-10 | Standard | Tshwane (GTP) | 7 | 7 | 3 | Yes | Analysis |
| 4 | 2025 Menlo Open (U14) | 2025-07-26 | 2025-07-26 | Standard | Tshwane (GTP) | 5 | 5 | 3 | Yes | Analysis |
| 5 | 2025 Silver Lakes Chess Club Open Chess Tournament (C) | 2025-05-03 | 2025-05-03 | Standard | Tshwane (GTP) | 5 | 5 | 1 | Yes | Analysis |
| 6 | Lubowski Open 2025 (D1) | 2025-03-21 | 2025-03-22 | Standard | Tshwane (GTP) | 5 | 5 | 3 | Yes | Analysis |
| 7 | 2025 Tshwane Chess OPEN Registration Tournament (B1) | 2025-01-25 | 2025-01-25 | Standard | Tshwane (GTP) | 5 | 5 | 3 | Yes | Analysis |
| 8 | Gauteng Inter-Region at UJ 2024 (U16 Candidates) | 2024-12-07 | 2024-12-08 | Standard | Johannesburg Metro (GJM) | 5 | 5 | 2.5 | Yes | Analysis |
| 9 | Lardies Ope 2024 (C) | 2024-10-26 | 2024-10-26 | Standard | Tshwane (GTP) | 5 | 5 | 4 | Yes | Analysis |
| 10 | Centurion Chess Open Tournament 2024 (C) | 2024-09-21 | 2024-09-21 | Standard | Tshwane (GTP) | 5 | 5 | 2.5 | Yes | Analysis |
| 11 | 2024 Etienne Lewis (U14) | 2024-08-30 | 2024-09-01 | Standard | Tshwane (GTP) | 7 | 7 | 2 | Yes | Analysis |
| 12 | 2024 Jacaranda Round Robin Open Chess Tournament (N) | 2024-08-17 | 2024-08-17 | Standard | Tshwane (GTP) | 5 | 5 | 4 | Yes | Analysis |
| 13 | 2024 Midstream College Open Chess Tournament (B2) | 2024-07-20 | 2024-07-20 | Standard | Tshwane (GTP) | 5 | 4 | 0 | Yes | Analysis |
| 14 | Menlopark Open Chess Tournament 2024 (C) | 2024-07-13 | 2024-07-13 | Standard | Tshwane (GTP) | 5 | 5 | 2.5 | Yes | Analysis |
| 15 | 2024 Prestige College Open Chess Tournament (D) | 2024-07-06 | 2024-07-06 | Standard | Tshwane (GTP) | 5 | 5 | 2 | Yes | Analysis |
Top 3 Streaks
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Tournament2025 Tshwane Chess OPEN Registration Tournament | TournamentLubowski Open 2025 | ||||||
| date2025-01-25 | rnd3 | typeStandard | result1 | date2025-03-21 | rnd2 | typeStandard | result1 | ||
| OpponentSmith, L (Leah) | OpponentKgwale, O (Obotegile) | ||||||||
| 2 | 4 | TournamentLardies Ope 2024 | TournamentGauteng Inter-Region at UJ 2024 | ||||||
| date2024-10-26 | rnd3 | typeStandard | result1 | date2024-12-07 | rnd1 | typeStandard | result0.5 | ||
| OpponentNjotini, N (Noxolo) | OpponentAkker, D (Dylan) | ||||||||
| 3 | 4 | TournamentCenturion Chess Open Tournament 2024 | TournamentLardies Ope 2024 | ||||||
| date2024-09-21 | rnd3 | typeStandard | result1 | date2024-10-26 | rnd1 | typeStandard | result1 | ||
| OpponentLabuscagne, W (Waldo) | OpponentSehoka, L (Lesedi) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Tournament2025 Tshwane Chess OPEN Registration Tournament | TournamentLubowski Open 2025 | ||||||
| date2025-01-25 | rnd3 | typeStandard | result1 | date2025-03-21 | rnd2 | typeStandard | result1 | ||
| OpponentSmith, L (Leah) | OpponentKgwale, O (Obotegile) | ||||||||
| 2 | 4 | TournamentLardies Ope 2024 | TournamentGauteng Inter-Region at UJ 2024 | ||||||
| date2024-10-26 | rnd3 | typeStandard | result1 | date2024-12-07 | rnd1 | typeStandard | result0.5 | ||
| OpponentNjotini, N (Noxolo) | OpponentAkker, D (Dylan) | ||||||||
| 3 | 4 | TournamentCenturion Chess Open Tournament 2024 | TournamentLardies Ope 2024 | ||||||
| date2024-09-21 | rnd3 | typeStandard | result1 | date2024-10-26 | rnd1 | typeStandard | result1 | ||
| OpponentLabuscagne, W (Waldo) | OpponentSehoka, L (Lesedi) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Tournament2025 Tshwane Chess OPEN Registration Tournament | TournamentLubowski Open 2025 | ||||||
| date2025-01-25 | rnd3 | typeStandard | result1 | date2025-03-21 | rnd2 | typeStandard | result1 | ||
| OpponentSmith, L (Leah) | OpponentKgwale, O (Obotegile) | ||||||||
| 2 | 4 | Tournament2024 Jacaranda Round Robin Open Chess Tournament | Tournament2024 Jacaranda Round Robin Open Chess Tournament | ||||||
| date2024-08-17 | rnd2 | typeStandard | result1 | date2024-08-17 | rnd5 | typeStandard | result1 | ||
| OpponentNkosi, N (Nsika) | OpponentUdeagha, C (Chinonso) | ||||||||
| 3 | 3 | TournamentLardies Ope 2024 | TournamentLardies Ope 2024 | ||||||
| date2024-10-26 | rnd3 | typeStandard | result1 | date2024-10-26 | rnd5 | typeStandard | result1 | ||
| OpponentNjotini, N (Noxolo) | OpponentThobela, S (Sibusiso) | ||||||||
| # | Games | Start | End | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Tournament2025 Tshwane Chess OPEN Registration Tournament | TournamentLubowski Open 2025 | ||||||
| date2025-01-25 | rnd3 | typeStandard | result1 | date2025-03-21 | rnd2 | typeStandard | result1 | ||
| OpponentSmith, L (Leah) | OpponentKgwale, O (Obotegile) | ||||||||
| 2 | 4 | Tournament2024 Jacaranda Round Robin Open Chess Tournament | Tournament2024 Jacaranda Round Robin Open Chess Tournament | ||||||
| date2024-08-17 | rnd2 | typeStandard | result1 | date2024-08-17 | rnd5 | typeStandard | result1 | ||
| OpponentNkosi, N (Nsika) | OpponentUdeagha, C (Chinonso) | ||||||||
| 3 | 3 | TournamentLardies Ope 2024 | TournamentLardies Ope 2024 | ||||||
| date2024-10-26 | rnd3 | typeStandard | result1 | date2024-10-26 | rnd5 | typeStandard | result1 | ||
| OpponentNjotini, N (Noxolo) | OpponentThobela, S (Sibusiso) | ||||||||
| # | 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 | Jacobs ,H (Hanno) | 2 | 1 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1333.2 | 1333.2 | 1326 | 1333.2 | 0 | 0 | 0 | 0 | ||||||
| 2 | Labuscagne ,W (Waldo) | 2 | 2 | 425 | 2 | 2 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1058.8 | 1483.8 | 1045.3 | 1483.8 | 0 | 0 | 0 | 0 | ||||||
| 3 | Du Toit ,J (Janri) | 2 | 1 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1138.4 | 1138.4 | 1152.8 | 1138.4 | 0 | 0 | 0 | 0 | ||||||
| 4 | Maree ,M (Morgan) | 2 | 1 | 0 | 2 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1258.4 | 1258.4 | 1256.3 | 1258.4 | 0 | 0 | 0 | 0 | ||||||
| 5 | Cunningham ,D (Daegan) | 1 | 1 | 425 | 1 | 1 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1183.4 | 1608.4 | 1180.9 | 1608.4 | 0 | 0 | 0 | 0 | ||||||
| 6 | Botha ,RMJ (Robert) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1498 | 1073 | 1495.6 | 1073 | 0 | 0 | 0 | 0 | ||||||
| 7 | Du Toit ,M (Mine) | 1 | 1 | 425 | 1 | 1 | 425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1420.1 | 1845.1 | 1425.6 | 1845.1 | 0 | 0 | 0 | 0 | ||||||
| 8 | Monnagaratoe ,M (Moatlhodi) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1194.4 | 769.4 | 1186.5 | 769.4 | 0 | 0 | 0 | 0 | ||||||
| 9 | Ebersohn ,G (Gerhard) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1452.9 | 1027.9 | 1451.6 | 1027.9 | 0 | 0 | 0 | 0 | ||||||
| 10 | Blumenow ,Z (Zachary) | 1 | 0 | -425 | 1 | 0 | -425 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1175.8 | 750.8 | 1168.8 | 750.8 | 0 | 0 | 0 | 0 | ||||||
Norms
| # | Norm | Tournament | Start | End | Rounds | Games | Score | Details |
|---|---|---|---|---|---|---|---|---|