PLAYER PAGE

Tertius Jonker

1120109887
Tshwane (GTP)
Personal
Main rating
Rating 1519.9
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 1515.3
Final +/- 0
New Rating
()
Rating 1519.9
K-factor 32
Floor 1044.3
Highest 1544.3 (2026-01-01)
Min/Max +/- allowed 101.5
Standard rating
Rating 1457
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 1427.7
Final +/- 0
New Rating
()
Rating 1457
K-factor 32
Floor 1047.7
Highest 1547.7 (2026-01-01)
Min/Max +/- allowed 101
Rapid rating
Rating 1292.5
K-factor 36
Floor 792.5
Highest 1292.5 (2026-09-01)
Min/Max +/- allowed 145.3
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1292.5
K-factor 36
Floor 792.5
Highest 1292.5 (2026-09-01)
Min/Max +/- allowed 145.3
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 D4 Tshwane South Team Finals (U15 Open) Rapid 2026-08-22 2026-08-22 Tshwane (GTP) 5 1519.9 5 5 1777.7 43 Details
2 2026 Etienne Lewis (U16) Standard 2026-08-08 2026-08-10 Tshwane (GTP) 7 1519.9 7 4.5 1488.3 7.7 Details
3 2026 Menlo Open (B) Standard 2026-07-25 2026-07-25 Tshwane (GTP) 5 1519.9 4 1.5 1375.8 -10.9 Details
4 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
5 2026 Anton Van Wouw Open (C) Standard 2026-06-20 2026-06-20 Tshwane (GTP) 5 1451.1 5 3 1444.4 -2 Details
6 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
7 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
8 2026 PBHS Open (C) Standard 2026-04-25 2026-04-25 Tshwane (GTP) 5 1486.1 5 3 1455.5 -3.5 Details
9 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
10 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
11 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
12 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
13 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
14 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
15 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
16 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
17 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
18 MCA Tshwane Welcome 2026 (B) Standard 2026-01-24 2026-01-24 Tshwane (GTP) 5 1545.1 4 1 1329.4 -16.8 Details
19 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
20 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
21 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
22 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
23 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
24 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
25 2025 Alekhine Open (C) Standard 2025-09-06 2025-09-07 Tshwane (GTP) 5 1525.3 5 2.5 1415.9 -11.1 Details
26 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
27 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
28 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
29 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
30 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
31 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
32 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
33 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
34 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
35 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
36 AHS Open Chess Tournament 2025 (C) Standard 2025-03-01 2025-03-01 Tshwane (GTP) 5 1465.1 5 2 1335.9 -12 Details
37 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
38 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
39 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
40 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
41 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
42 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
43 2024 Etienne Lewis (U14) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1490.7 7 4 1406.9 -13.5 Details
44 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
45 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
46 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
47 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
48 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
49 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
50 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
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 101
Wins 47
Draws 11
Losses 43
White 51
Black 50
White wins 28
Black wins 19
Score 52.5
Percent 52
Dp 16.8
AOR 1457.7
Performance 1474.6
Game statistics (History)
Games 394
Wins 200
Draws 32
Losses 162
White 191
Black 203
White wins 106
Black wins 94
Score 216
Percent 54.8
Dp 41
AOR 1355.7
Performance 1396.7
Rankings (Main)
National
Overall 1780
Gender 1576
Age group 199
Gender/Age 166
Provincial
Overall 642
Gender 560
Age group 65
Gender/Age 50
Regional
Overall 232
Gender 200
Age group 23
Gender/Age 19
Rankings (Standard)
National
Overall 2294
Gender 1943
Age group 306
Gender/Age 243
Provincial
Overall 825
Gender 698
Age group 105
Gender/Age 80
Regional
Overall 303
Gender 250
Age group 39
Gender/Age 32
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 489
Gender 454
Age group 57
Gender/Age 49
Provincial
Overall 160
Gender 143
Age group 11
Gender/Age 9
Regional
Overall 39
Gender 34
Age group 3
Gender/Age 3
Performance ( )
Games 0
Score 0
Percent 0
Aor 0
Dp 0
Prat 0
Performance ()
Games 101
Score 52.5
Percent 52
Aor 1457.7
Dp 16.8
Prat 1474.6
Performance (12 months)
Games 122
Score 65
Percent 53.3
Aor 1454.7
Dp 27.9
Prat 1482.5
Performance (History)
Games 394
Score 216
Percent 54.8
Aor 1355.7
Dp 41
Prat 1396.7
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 Scholtz, R (Rohann) 3 2 1 2025 Etienne Lewis Closed Chess Tournament (U14) 2026 Etienne Lewis (U16) 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) 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 Mahlangu, NP (Nkosinathi Phillip) 3 0 3 2023 Tshwane Chess Open Registration Tournament (C2) Centurion Chess Open Tournament 2024 (B) Details
Standard 5 Swanepoel, L (Leja) 3 2 1 2022 D3 Cluster City Schools (U11) 2026 Piet Robbertse Open Chess Tournament (B) Details