PLAYER PAGE

Tertius Jonker

1120109887
Tshwane (GTP)
Personal
Main rating
Rating 1485.3
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 102
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1412.9
Final +/- 0
New Rating
()
Rating 1485.3
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 101.5
Standard rating
Rating 1484.5
K-factor 32
Floor 1047.7
Highest 1547.7 (2026-01-01)
Min/Max +/- allowed 101
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1412.9
Final +/- 0
New Rating
()
Rating 1484.5
K-factor 32
Floor 1047.7
Highest 1547.7 (2026-01-01)
Min/Max +/- allowed 101
Rapid 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
Blitz rating
Rating 1199.3
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 1199.3
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 2026 Blou Bull Chess Tournament (B) Standard 2026-02-21 2026-02-21 Tshwane (GTP) 5 1485.3 5 2.5 1563.6 10.9 Details
2 2026 AHS Chess Tournament (B) Standard 2026-02-28 2026-02-28 Tshwane (GTP) 5 1485.3 5 0.5 1301.9 -27.9 Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 Piet Robbertse Open Chess Tournament (B) Standard 2026-02-07 2026-02-08 Tshwane (GTP) 5 1545.1 4 1 1409.2 0 Details
2 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1545.1 4 1 1329.4 0 Details
3 2026 Tshwane Chess Registration Tournament (B) Standard 2026-01-31 2026-01-31 Tshwane (GTP) 5 1545.1 5 2 1464.4 0 Details
4 2025 Mzansi Individual Championships (U14 Open) Classical 2025-12-17 2025-12-20 Nelson Mandela Bay (ENM) 6 1517.1 6 3 1521.3 0 Details
5 2025 Mzansi Inter Provincial Team Championships (U14 Open) Standard 2025-12-15 2025-12-17 Nelson Mandela Bay (ENM) 6 1517.1 6 3 1504.6 0 Details
6 Gauteng Inter-Region at Emerald Resort 2025 (U14 Championship) Standard 2025-12-06 2025-12-07 Sedibeng (GSV) 5 1517.1 5 4 1675.2 0 Details
7 2025 Gauteng Top Schools Teams (U13) Standard 2025-08-29 2025-08-29 Tshwane (GTP) 5 1505.3 5 3.5 1709.2 0 Details
8 2025 Gauteng Schools Provincial Individual Chess Championship (U13 Boys) Standard 2025-09-27 2025-09-27 Tshwane (GTP) 5 1505.3 4 2.5 1351.1 0 Details
9 2025 Alekhine Open (C) Standard 2025-09-06 2025-09-07 Tshwane (GTP) 5 1525.3 5 2.5 1415.9 0 Details
10 2025 Tshwane North District CLOSED Team Championships (D3) (U13 Open) Standard 2025-08-16 2025-08-16 Tshwane (GTP) 5 1482.7 5 4 1578.4 0 Details
11 2025 Etienne Lewis Closed Chess Tournament (U14) Standard 2025-08-08 2025-08-10 Tshwane (GTP) 7 1482.7 7 4.5 1585.5 0 Details
12 2025 Tshwane North School District Cluster 4 & 5 Team League (D3) (U13 Open) Standard 2025-07-26 2025-07-26 Tshwane (GTP) 5 1451 5 3 1465.7 0 Details
13 South African Open 2025 (U14 Open) Classical 2025-07-03 2025-07-05 Johannesburg Metro (GJM) 5 1451 5 3.5 1633.6 0 Details
14 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1451 8 2.5 1353.5 0 Details
15 2025 Elise Steenkamp Open Chess Tournament (Bishop) Standard 2025-06-14 2025-06-15 Tshwane (GTP) 5 1452.3 5 3 1437.1 0 Details
16 2025 Tshwane North School District CLOSED Individual Chess Championship (U13 Open) Standard 2025-05-24 2025-05-24 Tshwane (GTP) 5 1430.6 5 4 1542.3 0 Details
17 2025 Tshwane North School District CLOSED Individual Championships Cluster 4&5 (U13 Open) Standard 2025-05-10 2025-05-10 Tshwane (GTP) 5 1430.6 5 4 1439 0 Details
18 South African Junior Closed Chess Championships 2025 (U14 Open) Classical 2025-03-31 2025-04-05 Cape Winelands (WCW) 9 1428.9 8 2.5 1436.4 0 Details
19 2025 Chris Greyling Open Chess Tournament (C) Standard 2025-03-15 2025-03-15 Tshwane (GTP) 5 1465.1 5 2.5 1346.6 0 Details
20 AHS Open Chess Tournament 2025 (C) Standard 2025-03-01 2025-03-01 Tshwane (GTP) 5 1465.1 5 2 1335.9 0 Details
21 2025 Piet Robbertse Fide Rated Open Chess Tournament (B) Standard 2025-02-01 2025-02-02 Tshwane (GTP) 5 1517.2 4 0 1149.1 0 Details
22 2025 Tshwane Chess OPEN Registration Tournament (A1) Standard 2025-01-25 2025-01-25 Tshwane (GTP) 5 1505.3 5 2 1518.4 0 Details
23 Mzansi Interprovincial Youth Chess Championships 2024 (U14 Open Premier) Classical 2024-12-16 2024-12-19 Capricorn (LCP) 7 1423.6 7 4.5 1537.5 0 Details
24 Gauteng Inter-Region at UJ 2024 (U14 Candidates) Standard 2024-12-07 2024-12-08 Johannesburg Metro (GJM) 5 1423.6 5 5 1715.9 0 Details
25 Gauteng Top Schools 2024 (U13 Open) Standard 2024-10-04 2024-10-04 Ekurhuleni (GE) 5 1399.7 5 4 1544.6 0 Details
26 Centurion Chess Open Tournament 2024 (B) Standard 2024-09-21 2024-09-21 Tshwane (GTP) 5 1490.7 5 1.5 1167 0 Details
27 2024 Etienne Lewis (U14) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1490.7 7 4 1406.9 0 Details
28 Gauteng Schools Individuals Finals 2024 (U13 Boys) Standard 2024-08-16 2024-08-16 Ekurhuleni (GE) 5 1490.7 5 3 1353.2 0 Details
29 2024 Tshwane North School District Team League Finals (U13) Standard 2024-08-03 2024-08-03 Tshwane (GTP) 5 1472.8 5 4 1480.4 0 Details
30 2024 Tshwane North School District Cluster 4 & 5 Team League (U13) Standard 2024-07-20 2024-07-20 Tshwane (GTP) 5 1442.7 5 4 1489.8 0 Details
31 2024 Tshwane North School District CLOSED Individual Champioships (U13 Boys) Standard 2024-05-11 2024-05-11 Tshwane (GTP) 5 1243.6 5 4.5 1672.5 0 Details
32 District 3 Cluster 4 and 5 Individuals 2024 (U13 Boys) Standard 2024-05-04 2024-05-04 Tshwane (GTP) 5 1243.6 5 4.5 1656.8 0 Details
33 2024 Tshwane Chess AHS Open Chess Tournament (C2) Standard 2024-02-24 2024-02-24 Tshwane (GTP) 5 1329.4 3 1 1241.3 0 Details
34 2024 Piet Robbertse Open Chess Tournament (C) Standard 2024-02-03 2024-02-04 Tshwane (GTP) 5 1329.4 5 2 1168.2 0 Details
35 2024 Blou Bul Open Chess Tournament (C) Standard 2024-02-10 2024-02-10 Tshwane (GTP) 5 1329.4 5 1 1068.6 0 Details
36 2024 Tshwane Chess OPEN Registration Tournament (C2) Standard 2024-01-27 2024-01-27 Tshwane (GTP) 5 1340.5 5 1 1037.1 0 Details
37 2024 Gauteng Inter-Region Chess Championship (U12B) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1340.5 5 4 1550.6 0 Details
38 2023 Tuks Open Chess Tournament (C) Standard 2023-10-07 2023-10-07 Tshwane (GTP) 5 1350.4 5 2 1287.6 0 Details
39 2023 Gauteng Top Schools (U11 Mixed) Standard 2023-08-18 2023-08-18 West Rand (GWR) 5 1250.3 5 2.5 1231.5 0 Details
40 2023 Tshwane North School District CLOSED League Championships (D3) Standard 2023-08-12 2023-08-12 Tshwane (GTP) 5 1250.3 5 5 1636.3 0 Details
41 2023 Etienne Lewis Closed Tournament (U12) Standard 2023-08-25 2023-08-27 Tshwane (GTP) 7 1250.3 7 4 1374 0 Details
42 2023 Lubowski Open Tournament (C) Standard 2023-06-24 2023-06-25 Tshwane (GTP) 5 1280.8 4 1 1089.1 0 Details
43 2023 Tshwane North School District CLOSED Individual Championships (D3) Standard 2023-05-13 2023-05-13 Tshwane (GTP) 5 1170.4 5 4 1455.4 0 Details
44 2023 Mid Gauteng Open Tournament (C) Standard 2023-05-06 2023-05-06 Tshwane (GTP) 5 1170.4 5 2 1206.5 0 Details
45 Gauteng Schools Individual Finals 2023 (U11 Boys) Standard 2023-05-26 2023-05-26 Ekurhuleni (GE) 5 1170.4 5 3 1339.1 0 Details
46 Tuks Junior Developmental Chess Tournament 2023 (Blue) Standard 2023-03-18 2023-03-18 Tshwane (GTP) 5 1195.8 5 1.5 1059.3 0 Details
47 2023 Tshwane Chess Open Registration Tournament (C2) Standard 2023-01-28 2023-01-28 Tshwane (GTP) 5 1205.7 5 2 1143.4 0 Details
48 2022 South African Junior Team Chess Championships (U12 Open) Classical 2022-12-04 2022-12-08 4 Knights (4K) 7 1203.5 4 2 1218.6 0 Details
49 2022 Etienne Lewis (U12 Open) Standard 2022-09-02 2022-09-04 Tshwane (GTP) 7 1233.3 7 3 1132 0 Details
50 Tuks Junior Developmental Tournament 2022 (Blue) Standard 2022-08-06 2022-08-06 Tshwane (GTP) 5 1245.3 4 1 944.3 0 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 13
Wins 2
Draws 4
Losses 7
White 7
Black 6
White wins 1
Black wins 1
Score 4
Percent 30.8
Dp -163.5
AOR 1569.4
Performance 1405.9
Game statistics (History)
Games 306
Wins 155
Draws 25
Losses 126
White 147
Black 159
White wins 79
Black wins 76
Score 167.5
Percent 54.7
Dp 40.3
AOR 1331.1
Performance 1371.4
Rankings (Main)
National
Overall 1974
Gender 1726
Age group 219
Gender/Age 174
Provincial
Overall 682
Gender 584
Age group 73
Gender/Age 53
Regional
Overall 250
Gender 210
Age group 26
Gender/Age 21
Rankings (Standard)
National
Overall 1842
Gender 1601
Age group 215
Gender/Age 171
Provincial
Overall 662
Gender 567
Age group 75
Gender/Age 55
Regional
Overall 247
Gender 207
Age group 26
Gender/Age 21
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 0
Score 0
Percent 0
Aor 0
Dp 0
Prat 0
Performance ()
Games 13
Score 4
Percent 30.8
Aor 1569.4
Dp -163.5
Prat 1405.9
Performance (12 months)
Games 102
Score 56
Percent 54.9
Aor 1443.3
Dp 41.7
Prat 1485
Performance (History)
Games 306
Score 167.5
Percent 54.7
Aor 1331.1
Dp 40.3
Prat 1371.4
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Smith, E (Eduan) 7 3 4 2023 Tshwane North School District CLOSED Individual Championships (D3) 2025 Tshwane North District CLOSED Team Championships (D3) (U13 Open) Details
Overall 2 Grahan, T (Tylo) 6 2 4 2019 TuksChess Open (D) 2024 Tshwane North School District CLOSED Individual Champioships (U13 Boys) Details
Overall 3 Haupt, J (Joshua) 4 2 2 District 3 Cluster 4 and 5 Individuals 2024 (U13 Boys) 2025 Tshwane North School District CLOSED Individual Chess Championship (U13 Open) Details
Overall 4 Swanepoel, L (Leja) 3 2 1 2022 D3 Cluster City Schools (U11) 2026 Piet Robbertse Open Chess Tournament (B) Details
Overall 5 Mahlangu, NP (Nkosinathi Phillip) 3 0 3 2023 Tshwane Chess Open Registration Tournament (C2) Centurion Chess Open Tournament 2024 (B) Details
Standard 1 Smith, E (Eduan) 7 3 4 2023 Tshwane North School District CLOSED Individual Championships (D3) 2025 Tshwane North District CLOSED Team Championships (D3) (U13 Open) Details
Standard 2 Grahan, T (Tylo) 6 2 4 2019 TuksChess Open (D) 2024 Tshwane North School District CLOSED Individual Champioships (U13 Boys) Details
Standard 3 Haupt, J (Joshua) 4 2 2 District 3 Cluster 4 and 5 Individuals 2024 (U13 Boys) 2025 Tshwane North School District CLOSED Individual Chess Championship (U13 Open) Details
Standard 4 Swanepoel, L (Leja) 3 2 1 2022 D3 Cluster City Schools (U11) 2026 Piet Robbertse Open Chess Tournament (B) Details
Standard 5 Hlatshwayo, Q (Qhawe) 3 3 0 District 3 Cluster 4 and 5 Individuals 2024 (U13 Boys) 2024 Etienne Lewis (U14) Details