PLAYER PAGE

Tertius Jonker

1120109887
Tshwane (GTP)
Personal
Main rating
Rating 1463.2
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 1452.6
Final +/- 0
New Rating
()
Rating 1463.2
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 101.5
Standard rating
Rating 1463.1
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 1452.6
Final +/- 0
New Rating
()
Rating 1463.1
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 Wynie Robbertse Chess Tournament 2026 (C) Standard 2026-06-27 2026-06-27 Tshwane (GTP) 5 1451.1 5 3 1513.7 8.7 Details
2 2026 Anton Van Wouw Open (C) Standard 2026-06-20 2026-06-20 Tshwane (GTP) 5 1451.1 5 3 1444.4 -2 Details
3 2026 D4 Central Cluster Individuals (U15 Boys) Standard 2026-05-23 2026-05-23 Tshwane (GTP) 5 1451.1 5 4 1537.1 12.6 Details
4 2026 D4 District Individuals (U15 Boys) Standard 2026-05-30 2026-05-30 Tshwane (GTP) 5 1451.1 5 2.5 1397.4 -7.2 Details
5 2026 PBHS Open (C) Standard 2026-04-25 2026-04-25 Tshwane (GTP) 5 1486.1 5 3 1455.5 -3.5 Details
6 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
7 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
8 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
9 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
10 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
11 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
12 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
13 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
14 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
15 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1545.1 4 1 1329.4 -16.8 Details
16 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
17 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
18 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
19 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
20 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
21 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
22 2025 Alekhine Open (C) Standard 2025-09-06 2025-09-07 Tshwane (GTP) 5 1525.3 5 2.5 1415.9 -11.1 Details
23 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
24 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
25 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
26 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
27 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
28 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
29 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
30 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
31 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
32 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
33 AHS Open Chess Tournament 2025 (C) Standard 2025-03-01 2025-03-01 Tshwane (GTP) 5 1465.1 5 2 1335.9 -12 Details
34 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
35 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
36 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
37 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
38 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
39 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
40 2024 Etienne Lewis (U14) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1490.7 7 4 1406.9 -13.5 Details
41 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
42 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
43 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
44 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
45 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
46 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
47 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
48 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
49 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
50 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
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 85
Wins 37
Draws 9
Losses 39
White 43
Black 42
White wins 23
Black wins 14
Score 41.5
Percent 48.8
Dp -10
AOR 1470.3
Performance 1460.3
Game statistics (History)
Games 378
Wins 190
Draws 30
Losses 158
White 183
Black 195
White wins 101
Black wins 89
Score 205
Percent 54.2
Dp 36
AOR 1354.2
Performance 1390.2
Rankings (Main)
National
Overall 2496
Gender 2158
Age group 308
Gender/Age 243
Provincial
Overall 842
Gender 726
Age group 106
Gender/Age 83
Regional
Overall 307
Gender 258
Age group 38
Gender/Age 31
Rankings (Standard)
National
Overall 2266
Gender 1941
Age group 289
Gender/Age 228
Provincial
Overall 793
Gender 680
Age group 100
Gender/Age 77
Regional
Overall 292
Gender 242
Age group 36
Gender/Age 29
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 481
Gender 441
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 85
Score 41.5
Percent 48.8
Aor 1470.3
Dp -10
Prat 1460.3
Performance (12 months)
Games 128
Score 68.5
Percent 53.5
Aor 1459.8
Dp 29.9
Prat 1489.6
Performance (History)
Games 378
Score 205
Percent 54.2
Aor 1354.2
Dp 36
Prat 1390.2
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 Swanepoel, L (Leja) 3 2 1 2022 D3 Cluster City Schools (U11) 2026 Piet Robbertse Open Chess Tournament (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 Viljoen, A (Amber) 3 1 2 2023 Tshwane Chess Open Registration Tournament (C2) Wynie Robbertse Chess Tournament 2026 (C) Details
Standard 5 Mahlangu, NP (Nkosinathi Phillip) 3 0 3 2023 Tshwane Chess Open Registration Tournament (C2) Centurion Chess Open Tournament 2024 (B) Details