PLAYER PAGE

Tertius Jonker

1120109887
Tshwane (GTP)
Personal
Main rating
Rating 1451.1
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 1403.4
Final +/- 0
New Rating
()
Rating 1451.1
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 101.5
Standard rating
Rating 1452.5
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 1422.1
Final +/- 0
New Rating
()
Rating 1452.5
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 1213.5
K-factor 36
Floor 713.5
Highest 1213.5 (2026-04-01)
Min/Max +/- allowed 162.7
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
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
No tournaments found.
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 PBHS Open (C) Standard 2026-04-25 2026-04-25 Tshwane (GTP) 5 1486.1 5 3 1455.5 -3.5 Details
2 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
3 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
4 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
5 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
6 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
7 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
8 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
9 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
10 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
11 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1545.1 4 1 1329.4 -16.8 Details
12 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
13 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
14 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
15 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
16 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
17 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
18 2025 Alekhine Open (C) Standard 2025-09-06 2025-09-07 Tshwane (GTP) 5 1525.3 5 2.5 1415.9 -11.1 Details
19 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
20 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
21 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
22 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
23 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
24 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
25 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
26 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
27 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
28 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
29 AHS Open Chess Tournament 2025 (C) Standard 2025-03-01 2025-03-01 Tshwane (GTP) 5 1465.1 5 2 1335.9 -12 Details
30 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
31 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
32 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
33 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
34 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
35 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
36 2024 Etienne Lewis (U14) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1490.7 7 4 1406.9 -13.5 Details
37 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
38 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
39 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
40 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
41 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
42 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
43 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
44 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
45 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
46 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
47 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
48 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
49 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
50 2023 Etienne Lewis Closed Tournament (U12) Standard 2023-08-25 2023-08-27 Tshwane (GTP) 7 1250.3 7 4 1374 19.9 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 65
Wins 25
Draws 8
Losses 32
White 32
Black 33
White wins 15
Black wins 10
Score 29
Percent 44.6
Dp -45.8
AOR 1502.1
Performance 1456.3
Game statistics (History)
Games 358
Wins 178
Draws 29
Losses 151
White 172
Black 186
White wins 93
Black wins 85
Score 192.5
Percent 53.8
Dp 32.1
AOR 1353.5
Performance 1385.6
Rankings (Main)
National
Overall 2671
Gender 2302
Age group 331
Gender/Age 265
Provincial
Overall 911
Gender 783
Age group 110
Gender/Age 87
Regional
Overall 337
Gender 280
Age group 42
Gender/Age 35
Rankings (Standard)
National
Overall 2378
Gender 2033
Age group 308
Gender/Age 245
Provincial
Overall 843
Gender 718
Age group 107
Gender/Age 83
Regional
Overall 313
Gender 258
Age group 41
Gender/Age 34
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 478
Gender 438
Age group 48
Gender/Age 41
Provincial
Overall 171
Gender 153
Age group 12
Gender/Age 10
Regional
Overall 42
Gender 37
Age group 3
Gender/Age 3
Performance ( )
Games 0
Score 0
Percent 0
Aor 0
Dp 0
Prat 0
Performance ()
Games 65
Score 29
Percent 44.6
Aor 1502.1
Dp -45.8
Prat 1456.3
Performance (12 months)
Games 131
Score 68
Percent 51.9
Aor 1470.2
Dp 16.2
Prat 1486.4
Performance (History)
Games 358
Score 192.5
Percent 53.8
Aor 1353.5
Dp 32.1
Prat 1385.6
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 Kirstein, T (Tinus Ederich) 3 2 1 Tuks Junior Developmental Tournament 2022 (Blue) 2026 AHS Chess Tournament (B) 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 Swanepoel, L (Leja) 3 2 1 2022 D3 Cluster City Schools (U11) 2026 Piet Robbertse Open Chess Tournament (B) Details
Standard 5 Kirstein, T (Tinus Ederich) 3 2 1 Tuks Junior Developmental Tournament 2022 (Blue) 2026 AHS Chess Tournament (B) Details