PLAYER PAGE

Tertius Jonker

1120109887
Tshwane (GTP)
Personal
Main rating
Rating 1486.1
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 102
Rating Change
()
Games 22
Score 9
We 9.95
SWe -0.99
Temp +/- -31.6
Penalties 0
Weight perform 1412
Final +/- -31.6
New Rating
()
Rating 1454.6
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 101.5
Standard rating
Rating 1486.7
K-factor 32
Floor 1047.7
Highest 1547.7 (2026-01-01)
Min/Max +/- allowed 101
Rating Change
()
Games 13
Score 5
We 6
SWe -1
Temp +/- -32
Penalties 0
Weight perform 1446
Final +/- -32
New Rating
()
Rating 1454.8
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 9
Score 4
We 3.6
SWe 0.4
Temp +/- 14.3
Penalties 0
Weight perform 0
Final +/- +14.3
New Rating
()
Rating 1213.5
K-factor 36
Floor 713.5
Highest 1213.5 (2026-04-01)
Min/Max +/- allowed 162.7
Rating Graph
Tournaments
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 KSNG Open Chess Tournament (C) Standard 2026-04-18 2026-04-18 Tshwane (GTP) 5 1486.1 5 3 1444.7 -5.2 Details
2 South African Junior Closed Chess Championship 2026 (U14 Open) Classical 2026-03-28 2026-04-02 Bojanala Platina (NBR) 9 1486.1 8 2 1398.1 -26.9 Details
3 South African Junior Closed Chess Championship 2026 (Blitz) Blitz 2026-03-31 2026-03-31 Bojanala Platina (NBR) 9 1486.1 9 4 1497.7 0.5 Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 Lubowski Open Chess Tournament (C) Standard 2026-03-21 2026-03-22 Tshwane (GTP) 5 1485.3 5 2.5 1437 -7.2 Details
2 2026 Chris Greyling Open Tournament (C) Standard 2026-03-14 2026-03-14 Tshwane (GTP) 5 1485.3 5 3.5 1556.6 10.2 Details
3 2026 Silver Lakes Open Chess Tournament (C) Standard 2026-03-07 2026-03-07 Tshwane (GTP) 5 1485.3 5 4 1584.6 14.7 Details
4 2026 Blou Bull Chess Tournament (B) Standard 2026-02-21 2026-02-21 Tshwane (GTP) 5 1485.3 5 2.5 1563.6 11 Details
5 2026 AHS Chess Tournament (B) Standard 2026-02-28 2026-02-28 Tshwane (GTP) 5 1485.3 5 0.5 1301.9 -27.8 Details
6 2026 Piet Robbertse Open Chess Tournament (B) Standard 2026-02-07 2026-02-08 Tshwane (GTP) 5 1545.1 4 1 1409.2 -12.2 Details
7 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1545.1 4 1 1329.4 -16.8 Details
8 2026 Tshwane Chess Registration Tournament (B) Standard 2026-01-31 2026-01-31 Tshwane (GTP) 5 1545.1 5 2 1464.4 -8.5 Details
9 2025 Mzansi Individual Championships (U14 Open) Classical 2025-12-17 2025-12-20 Nelson Mandela Bay (ENM) 6 1517.1 6 3 1521.3 0.6 Details
10 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 -1.5 Details
11 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 18.4 Details
12 2025 Gauteng Top Schools Teams (U13) Standard 2025-08-29 2025-08-29 Tshwane (GTP) 5 1505.3 5 3.5 1709.2 19.1 Details
13 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 -12 Details
14 2025 Alekhine Open (C) Standard 2025-09-06 2025-09-07 Tshwane (GTP) 5 1525.3 5 2.5 1415.9 -11.1 Details
15 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 10.1 Details
16 2025 Etienne Lewis Closed Chess Tournament (U14) Standard 2025-08-08 2025-08-10 Tshwane (GTP) 7 1482.7 7 4.5 1585.5 15.2 Details
17 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 0.8 Details
18 South African Open 2025 (U14 Open) Classical 2025-07-03 2025-07-05 Johannesburg Metro (GJM) 5 1451 5 3.5 1633.6 22.4 Details
19 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1451 8 2.5 1353.5 -3.3 Details
20 2025 Elise Steenkamp Open Chess Tournament (Bishop) Standard 2025-06-14 2025-06-15 Tshwane (GTP) 5 1452.3 5 3 1437.1 -0.8 Details
21 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 11.8 Details
22 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 1.8 Details
23 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 1 Details
24 2025 Chris Greyling Open Chess Tournament (C) Standard 2025-03-15 2025-03-15 Tshwane (GTP) 5 1465.1 5 2.5 1346.6 -10.8 Details
25 AHS Open Chess Tournament 2025 (C) Standard 2025-03-01 2025-03-01 Tshwane (GTP) 5 1465.1 5 2 1335.9 -12 Details
26 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 -32.7 Details
27 2025 Tshwane Chess OPEN Registration Tournament (A1) Standard 2025-01-25 2025-01-25 Tshwane (GTP) 5 1505.3 5 2 1518.4 1.8 Details
28 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 18 Details
29 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 33 Details
30 Gauteng Top Schools 2024 (U13 Open) Standard 2024-10-04 2024-10-04 Ekurhuleni (GE) 5 1399.7 5 4 1544.6 14.9 Details
31 Centurion Chess Open Tournament 2024 (B) Standard 2024-09-21 2024-09-21 Tshwane (GTP) 5 1490.7 5 1.5 1167 -30.7 Details
32 2024 Etienne Lewis (U14) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1490.7 7 4 1406.9 -13.5 Details
33 Gauteng Schools Individuals Finals 2024 (U13 Boys) Standard 2024-08-16 2024-08-16 Ekurhuleni (GE) 5 1490.7 5 3 1353.2 -12.6 Details
34 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 1.3 Details
35 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 4.1 Details
36 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 41.2 Details
37 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 39.5 Details
38 2024 Tshwane Chess AHS Open Chess Tournament (C2) Standard 2024-02-24 2024-02-24 Tshwane (GTP) 5 1329.4 3 1 1241.3 -4.5 Details
39 2024 Piet Robbertse Open Chess Tournament (C) Standard 2024-02-03 2024-02-04 Tshwane (GTP) 5 1329.4 5 2 1168.2 -18.6 Details
40 2024 Blou Bul Open Chess Tournament (C) Standard 2024-02-10 2024-02-10 Tshwane (GTP) 5 1329.4 5 1 1068.6 -24.7 Details
41 2024 Tshwane Chess OPEN Registration Tournament (C2) Standard 2024-01-27 2024-01-27 Tshwane (GTP) 5 1340.5 5 1 1037.1 -30.2 Details
42 2024 Gauteng Inter-Region Chess Championship (U12B) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1340.5 5 4 1550.6 24 Details
43 2023 Tuks Open Chess Tournament (C) Standard 2023-10-07 2023-10-07 Tshwane (GTP) 5 1350.4 5 2 1287.6 -5.5 Details
44 2023 Gauteng Top Schools (U11 Mixed) Standard 2023-08-18 2023-08-18 West Rand (GWR) 5 1250.3 5 2.5 1231.5 -2.5 Details
45 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 38.3 Details
46 2023 Etienne Lewis Closed Tournament (U12) Standard 2023-08-25 2023-08-27 Tshwane (GTP) 7 1250.3 7 4 1374 19.9 Details
47 2023 Lubowski Open Tournament (C) Standard 2023-06-24 2023-06-25 Tshwane (GTP) 5 1280.8 4 1 1089.1 -16.9 Details
48 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 28.6 Details
49 2023 Mid Gauteng Open Tournament (C) Standard 2023-05-06 2023-05-06 Tshwane (GTP) 5 1170.4 5 2 1206.5 2.7 Details
50 Gauteng Schools Individual Finals 2023 (U11 Boys) Standard 2023-05-26 2023-05-26 Ekurhuleni (GE) 5 1170.4 5 3 1339.1 17.1 Details
Game statistics ( )
Games 5
Wins 3
Draws 0
Losses 2
White 2
Black 3
White wins 2
Black wins 1
Score 3
Percent 60
Dp 85
AOR 1359.7
Performance 1444.7
Game statistics ()
Games 60
Wins 22
Draws 8
Losses 30
White 30
Black 30
White wins 14
Black wins 8
Score 26
Percent 43.3
Dp -56.7
AOR 1513
Performance 1456.4
Game statistics (History)
Games 353
Wins 175
Draws 29
Losses 149
White 170
Black 183
White wins 92
Black wins 83
Score 189.5
Percent 53.7
Dp 31.3
AOR 1353.3
Performance 1384.6
Rankings (Main)
National
Overall 2035
Gender 1778
Age group 226
Gender/Age 183
Provincial
Overall 697
Gender 603
Age group 72
Gender/Age 55
Regional
Overall 255
Gender 217
Age group 26
Gender/Age 22
Rankings (Standard)
National
Overall 1908
Gender 1658
Age group 222
Gender/Age 182
Provincial
Overall 673
Gender 581
Age group 75
Gender/Age 57
Regional
Overall 250
Gender 214
Age group 26
Gender/Age 22
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 471
Gender 423
Age group 52
Gender/Age 43
Provincial
Overall 164
Gender 140
Age group 12
Gender/Age 9
Regional
Overall 46
Gender 34
Age group 4
Gender/Age 3
Performance ( )
Games 13
Score 5
Percent 38.5
Aor 1514.1
Dp -98.1
Prat 1416
Performance ()
Games 60
Score 26
Percent 43.3
Aor 1513
Dp -56.7
Prat 1456.4
Performance (12 months)
Games 136
Score 73
Percent 53.7
Aor 1456.6
Dp 31.2
Prat 1487.9
Performance (History)
Games 353
Score 189.5
Percent 53.7
Aor 1353.3
Dp 31.3
Prat 1384.6
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Smith, E (Eduan) 8 4 4 2023 Tshwane North School District CLOSED Individual Championships (D3) 2026 AHS Chess Tournament (B) 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 Mahlangu, NP (Nkosinathi Phillip) 3 0 3 2023 Tshwane Chess Open Registration Tournament (C2) Centurion Chess Open Tournament 2024 (B) Details
Overall 5 Naude, J (Johan) 3 1 2 Tuks Junior Chess Club Developmental Tournament 2022 (Red) 2024 Tshwane Chess AHS Open Chess Tournament (C2) Details
Standard 1 Smith, E (Eduan) 8 4 4 2023 Tshwane North School District CLOSED Individual Championships (D3) 2026 AHS Chess Tournament (B) 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 Hlatshwayo, Q (Qhawe) 3 3 0 District 3 Cluster 4 and 5 Individuals 2024 (U13 Boys) 2024 Etienne Lewis (U14) Details
Standard 5 Kirstein, T (Tinus Ederich) 3 2 1 Tuks Junior Developmental Tournament 2022 (Blue) 2026 AHS Chess Tournament (B) Details