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 10
Score 7
We 6.03
SWe 0.07
Temp +/- 2.3
Penalties 0
Weight perform 1505.9
Final +/- +2.3
New Rating
()
Rating 1522.2
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 5
Score 2
We 1.81
SWe 0.19
Temp +/- 6.1
Penalties 0
Weight perform 1436.8
Final +/- +6.1
New Rating
()
Rating 1463.1
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 5
Score 5
We 3.82
SWe 0.31
Temp +/- 11.3
Penalties 0
Weight perform 0
Final +/- +11.3
New Rating
()
Rating 1303.8
K-factor 36
Floor 803.8
Highest 1303.8 (2026-10-01)
Min/Max +/- allowed 143
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
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 Gauteng Northl Chess Tournament (B) Standard 2026-10-10 2026-10-11 Tshwane (GTP) 5 1519.9 5 2 1486 -4.8 Details
2 Gauteng Top Schools Teams 2026 (U15 Open) Rapid 2026-08-28 2026-08-28 Ekurhuleni (GE) 5 1519.9 5 5 1598.7 7.1 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 5
Wins 1
Draws 2
Losses 2
White 2
Black 3
White wins 0
Black wins 1
Score 2
Percent 40
Dp -85
AOR 1571
Performance 1486
Game statistics ()
Games 111
Wins 53
Draws 13
Losses 45
White 56
Black 55
White wins 31
Black wins 22
Score 59.5
Percent 53.6
Dp 30.6
AOR 1450.1
Performance 1480.7
Game statistics (History)
Games 404
Wins 206
Draws 34
Losses 164
White 196
Black 208
White wins 109
Black wins 97
Score 223
Percent 55.2
Dp 44.2
AOR 1356.1
Performance 1400.3
Rankings (Main)
National
Overall 1782
Gender 1576
Age group 196
Gender/Age 162
Provincial
Overall 634
Gender 553
Age group 64
Gender/Age 49
Regional
Overall 227
Gender 196
Age group 23
Gender/Age 19
Rankings (Standard)
National
Overall 2276
Gender 1936
Age group 305
Gender/Age 240
Provincial
Overall 819
Gender 699
Age group 105
Gender/Age 80
Regional
Overall 298
Gender 249
Age group 40
Gender/Age 33
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 488
Gender 452
Age group 58
Gender/Age 50
Provincial
Overall 160
Gender 143
Age group 12
Gender/Age 10
Regional
Overall 37
Gender 32
Age group 3
Gender/Age 3
Performance ( )
Games 5
Score 2
Percent 40
Aor 1571
Dp -85
Prat 1486
Performance ()
Games 111
Score 59.5
Percent 53.6
Aor 1450.1
Dp 30.6
Prat 1480.7
Performance (12 months)
Games 128
Score 69.5
Percent 54.3
Aor 1454.8
Dp 36.5
Prat 1491.3
Performance (History)
Games 404
Score 223
Percent 55.2
Aor 1356.1
Dp 44.2
Prat 1400.3
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 Viljoen, A (Amber) 3 1 2 2023 Tshwane Chess Open Registration Tournament (C2) Wynie Robbertse Chess Tournament 2026 (C) 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 Thomson-Selibowitz, R (Ryder) 3 2 1 AHS Open Chess Tournament 2025 (C) 2026 Menlo Open (B) Details
Standard 5 Scholtz, R (Rohann) 3 2 1 2025 Etienne Lewis Closed Chess Tournament (U14) 2026 Etienne Lewis (U16) Details