PLAYER PAGE

Jonah Robertson

1120112288
Cape Winelands (WCW)
Personal
Main rating
Rating 1621.5
K-factor 28
Floor 1149.5
Highest 1649.5 (2025-07-01)
Min/Max +/- allowed 87
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1474.1
Final +/- 0
New Rating
()
Rating 1621.5
K-factor 28
Floor 1149.5
Highest 1649.5 (2025-07-01)
Min/Max +/- allowed 87.4
Standard rating
Rating 1575.4
K-factor 28
Floor 1103.9
Highest 1639.5 (2019-04-01)
Min/Max +/- allowed 88.7
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1521.8
Final +/- 0
New Rating
()
Rating 1575.4
K-factor 28
Floor 1103.9
Highest 1639.5 (2019-04-01)
Min/Max +/- allowed 88.7
Rapid rating
Rating 1628.8
K-factor 28
Floor 1158.7
Highest 1671.5 (2023-11-01)
Min/Max +/- allowed 84.7
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1406.6
Final +/- 0
New Rating
()
Rating 1628.8
K-factor 28
Floor 1158.7
Highest 1671.5 (2023-11-01)
Min/Max +/- allowed 84.7
Blitz rating
Rating 1199.2
K-factor 36
Floor 700
Highest 1200 (2022-07-01)
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 1199.2
K-factor 36
Floor 700
Highest 1200 (2022-07-01)
Min/Max +/- allowed 165.8
Rating Graph
Tournaments
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 Cape Winelands Schools - High School Trials 1 2026 (U15 Boys) Standard 2026-02-28 2026-02-28 Cape Winelands 5 1621.5 5 3 1486 -16.3 Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 Marie Delport Memorial 2026 (Open) Standard 2026-01-31 2026-01-31 Cape Winelands (WCW) 6 1623.4 6 4 1519.9 0 Details
2 2025 Mzansi Inter Provincial Team Championships (U14 Open) Standard 2025-12-15 2025-12-17 Nelson Mandela Bay (ENM) 6 1649.5 6 2.5 1533 0 Details
3 WCSC Kings & Queens 2025 (Kings) Rapid 2025-11-29 2025-11-29 Cape Winelands (WCW) 6 1649.5 4 1.5 1394.5 0 Details
4 2025 WC Rural Cup (U14) Standard 2025-06-14 2025-06-15 Eden (WEG) 6 1631.1 6 4 1731.2 0 Details
5 Western Cape Schools Individual Championship 2025 (U13 Boys) Standard 2025-05-17 2025-05-18 Cape Winelands (WCW) 6 1608.7 6 4.5 1633.3 0 Details
6 Brave Knights Rapid 2025 (U13) Rapid 2025-05-03 2025-05-03 Cape Winelands (WCW) 6 1608.7 6 5.5 1752.2 0 Details
7 Cape Winelands Schools Prestige 2025 (U13 Boys) Standard 2025-03-08 2025-03-08 Cape Winelands (WCW) 5 1602.4 5 4 1638.8 0 Details
8 Cape Winelands Schools - Trials 1 2025 (U13 Boys) Standard 2025-02-22 2025-02-22 Cape Winelands (WCW) 5 1596.9 5 4.5 1616.1 0 Details
9 Marie Delport Memorial 2025 (Open) Standard 2025-01-25 2025-01-26 Cape Winelands (WCW) 6 1574.4 6 3 1355.3 0 Details
10 Mzansi Interprovincial Youth Chess Championships 2024 (U14 Open Championship) Classical 2024-12-16 2024-12-19 Capricorn (LCP) 7 1616.7 7 4 1425 0 Details
11 Worcester Knock-Out 2024 (U13 Boys) Rapid 2024-10-19 2024-10-19 Cape Winelands (WCW) 6 1599.1 6 4 1468.2 0 Details
12 Strategema Chess October 2024 (U13) Standard 2024-10-05 2024-10-05 Cape Winelands (WCW) 5 1599.1 5 5 1842.6 0 Details
13 De Villiers PS Tournament 2024 (U14) Standard 2024-08-17 2024-08-17 Cape Winelands (WCW) 5 1600.3 5 4.5 1581 0 Details
14 Western Cape - Kings and Queens 2024 (Boys) Rapid 2024-06-08 2024-06-08 Overberg (WOS) 5 1593.9 4 3 1674.8 0 Details
15 Western Cape PS Individuals Championship 2024 (U13 Boys) Standard 2024-05-04 2024-05-05 West Coast (WCU) 6 1604.1 6 4 1540 0 Details
16 Western Cape Inter Region Cup 2024 (U14 Boys) Standard 2024-03-23 2024-03-24 Overberg (WOS) 5 1618.5 3 1.5 1493.2 0 Details
17 Brave Knights 2024 (U13) Rapid 2024-03-16 2024-03-16 Cape Winelands (WCW) 6 1618.5 6 6 1655.9 0 Details
18 Cape Winelands Schools - Prestige 2024 (U13 Boys) Standard 2024-03-02 2024-03-02 Cape Winelands (WCW) 5 1618.5 5 4 1528.2 0 Details
19 Cape Winelands Schools - PS Trials 1 2024 (U13 Boys) Rapid 2024-02-10 2024-02-10 Cape Winelands (WCW) 6 1630 6 4.5 1521.3 0 Details
20 Cape Winelands - Marie Delport Memorial 2024 (U14) Rapid 2024-01-27 2024-01-27 Cape Winelands (WCW) 6 1632.6 6 5 1599.7 0 Details
21 2023 Western Cape Rural Cup (U12) Standard 2023-12-09 2023-12-10 Cape Winelands (WCW) 5 1638.6 4 2.5 1581.4 0 Details
22 Ashton Skaakmat Rapid 2023 (U11) Rapid 2023-11-18 2023-11-18 Cape Winelands (WCW) 6 1616.1 6 6 1803.2 0 Details
23 Bonnievale Open Rapid 2023 (U12) Rapid 2023-10-21 2023-10-21 Cape Winelands (WCW) 6 1586.9 6 6 1811.8 0 Details
24 Cape Town Junior Chess League Finals 2023 (U12A) Rapid 2023-09-16 2023-09-16 Cape Town (WCT) 7 1554.7 7 6 1519.5 0 Details
25 Western Cape Top Schools 2023 (U11 Mixed) Standard 2023-09-02 2023-09-03 Cape Winelands (WCW) 6 1554.7 5 4 1781.5 0 Details
26 CW Top Schools 2023 (U7-U11 Mixed + U11 Girls) Rapid 2023-08-26 2023-08-26 Cape Winelands (WCW) 5 1555.7 5 4 1550 0 Details
27 Cape Town Junior Chess League - Round 1 2023 (U12A) Rapid 2023-07-22 2023-07-22 Cape Town (WCT) 7 1531.6 6 5 1519.6 0 Details
28 Langeberg Top Schools 2023 (U7-U13 Mix) Rapid 2023-07-29 2023-07-29 Cape Winelands (WCW) 5 1531.6 5 5 1744.8 0 Details
29 Cape Town Junior League 2nd Qualifier 2023 (U12) Rapid 2023-06-03 2023-06-03 Cape Town (WCT) 6 1514.1 6 6 1654.6 0 Details
30 Western Cape PS Individuals 2023 (U11 Boys) Standard 2023-05-05 2023-05-06 Cape Town (WCT) 6 1541.5 6 4 1403.9 0 Details
31 CWIS Inaugural Chess Championships 2023 Blitz 2023-03-04 2023-03-04 Cape Winelands (WCW) 5 1466.1 5 5 1621.5 0 Details
32 Cape Winelands Schools Prestige 2023 (U11 Boys) Standard 2023-03-11 2023-03-11 Cape Winelands (WCW) 5 1466.1 5 5 1737.7 0 Details
33 Langeberg Schools Chess Trials 2023 (U11 Open) Rapid 2023-02-11 2023-02-11 Cape Winelands (WCW) 5 1394.5 5 5 1780.7 0 Details
34 Cape Winelands Schools Chess - Trials 1 2023 (U11 Boys) Standard 2023-02-18 2023-02-18 Cape Winelands (WCW) 5 1394.5 5 4 1441.5 0 Details
35 Marie Delport Memorial 2023 (Open) Standard 2023-01-21 2023-01-21 Cape Winelands (WCW) 6 1408.7 6 4 1333.1 0 Details
36 McGregor Chess December Festival 2022 Standard 2022-12-10 2022-12-10 Cape Winelands (WCW) 4 1375.5 4 4 1641.2 0 Details
37 Robertson Strategema Club 2022 (U11) Standard 2022-10-29 2022-10-29 Cape Winelands (WCW) 5 1377.1 0 0 0 0 Details
38 Heritage Chess Open 2022 Standard 2022-10-01 2022-10-01 Cape Winelands (WCW) 5 1377.1 5 3 1374 0 Details
39 Strategema 2022 (U11) Standard 2022-09-10 2022-09-10 Cape Winelands (WCW) 5 1418.6 0 0 0 0 Details
40 Langeberg Spring Open 2022 (A) Rapid 2022-09-03 2022-09-03 Cape Winelands (WCW) 5 1418.6 4 0.5 957.8 0 Details
41 WCCA Rural Cup 2022 (U12) Standard 2022-08-13 2022-08-14 Overberg (WOS) 5 1432.7 4 2 1321.2 0 Details
42 South African Open 2022 (U12) Standard 2022-07-11 2022-07-13 Cape Town (WCT) 6 1442 6 4 1523.1 0 Details
43 WCCA Rural Cup Blitz 2022 Blitz 2022-07-12 2022-07-12 Overberg (WOS) 5 1442 4 2 1435.6 0 Details
44 Brave Knights Chess Festival 2022 (A) Standard 2022-07-30 2022-07-30 Cape Winelands (WCW) 5 1442 4 1.5 1244.7 0 Details
45 McGregor Open 2022 (A) Standard 2022-06-11 2022-06-11 Cape Winelands (WCW) 5 1489.5 5 2 1179 0 Details
46 Langeberg Open 2022 (Sandard) Standard 2022-06-25 2022-06-25 Cape Winelands (WCW) 5 1489.5 5 4 1477.1 0 Details
47 Western Cape Schools 2022 (U11 Boys) Standard 2022-05-28 2022-05-29 Cape Winelands (WCW) 6 1477.2 6 4 1466.1 0 Details
48 Strategema Chess Festival 2022 (U11 Boys) Rapid 2022-05-14 2022-05-14 Cape Winelands (WCW) 5 1477.2 5 5 1606.1 0 Details
49 McGregor Kings Chess Festival 2022 (U11) Rapid 2022-04-09 2022-04-09 Cape Winelands (WCW) 5 1456.8 5 5 1642 0 Details
50 Cape Winelands Schools 2022 (U11 Boys) Standard 2022-03-12 2022-03-12 Cape Winelands (WCW) 5 1451.5 5 4 1490.1 0 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 6
Wins 3
Draws 2
Losses 1
White 3
Black 3
White wins 1
Black wins 2
Score 4
Percent 66.7
Dp 141.7
AOR 1378.2
Performance 1519.9
Game statistics (History)
Games 324
Wins 233
Draws 22
Losses 69
White 162
Black 162
White wins 119
Black wins 114
Score 244
Percent 75.3
Dp 215.1
AOR 1307.1
Performance 1522.3
Rankings (Main)
National
Overall 863
Gender 802
Age group 82
Gender/Age 69
Provincial
Overall 263
Gender 244
Age group 22
Gender/Age 17
Regional
Overall 23
Gender 19
Age group 2
Gender/Age 2
Rankings (Standard)
National
Overall 1043
Gender 950
Age group 113
Gender/Age 94
Provincial
Overall 297
Gender 267
Age group 32
Gender/Age 26
Regional
Overall 35
Gender 27
Age group 5
Gender/Age 4
Rankings (Rapid)
National
Overall 129
Gender 127
Age group 8
Gender/Age 8
Provincial
Overall 64
Gender 62
Age group 6
Gender/Age 6
Regional
Overall 6
Gender 5
Age group 1
Gender/Age 1
Rankings (Blitz)
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
Performance ( )
Games 0
Score 0
Percent 0
Aor 0
Dp 0
Prat 0
Performance ()
Games 6
Score 4
Percent 66.7
Aor 1378.2
Dp 141.7
Prat 1519.9
Performance (12 months)
Games 39
Score 26
Percent 66.7
Aor 1468.3
Dp 141.7
Prat 1610
Performance (History)
Games 324
Score 244
Percent 75.3
Aor 1307.1
Dp 215.1
Prat 1522.3
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Lukas, J (Janeva) 7 4 3 Cape Winelands Open 2019 (U8) CW Top Schools 2023 (U7-U11 Mixed + U11 Girls) Details
Overall 2 Brink, A (Andrew) 6 2 4 Western Cape Top Schools 2023 (U11 Mixed) 2025 Mzansi Inter Provincial Team Championships (U14 Open) Details
Overall 3 Van Zyl, A (Andre) 4 2 2 Lanfeberg Schools Chess Trials 2022 (U11) Langeberg Schools Chess Trials 2023 (U11 Open) Details
Overall 4 Cornelius, L (Laythan) 4 3 1 Western Cape PS Individuals 2023 (U11 Boys) Western Cape Schools Individual Championship 2025 (U13 Boys) Details
Overall 5 Koert, D (Dane) 4 0 4 Langeberg Schools Chess Trials 2023 (U11 Open) Cape Winelands Schools Prestige 2025 (U13 Boys) Details
Standard 1 Brink, A (Andrew) 5 1 4 Western Cape Top Schools 2023 (U11 Mixed) 2025 Mzansi Inter Provincial Team Championships (U14 Open) Details
Standard 2 Davids, JW (Jo-Wayne) 3 2 1 McGregor Open 2022 (A) Marie Delport Memorial 2026 (Open) Details
Standard 3 Goosen, J (Jeandre) 3 2 1 Cape Winelands Open 2019 (U8) Cape Winelands Schools Prestige 2023 (U11 Boys) Details
Standard 4 Januarie, L (Lee Roy) 3 3 0 Cape Winelands Schools 2022 (U11 Boys) Cape Winelands Schools Prestige 2023 (U11 Boys) Details
Standard 5 Cornelius, L (Laythan) 3 2 1 Western Cape PS Individuals 2023 (U11 Boys) Western Cape Schools Individual Championship 2025 (U13 Boys) Details
Rapid 1 Lukas, J (Janeva) 5 3 2 Robertson Chess 2020 (U9) CW Top Schools 2023 (U7-U11 Mixed + U11 Girls) Details
Rapid 2 Prinsloo, L (Lyle) 3 1 2 Western Cape Schools 2021 (U9 Boys) Brave Knights Rapid 2025 (U13) Details
Rapid 3 Van Zyl, A (Andre) 3 1 2 Lanfeberg Schools Chess Trials 2022 (U11) Langeberg Schools Chess Trials 2023 (U11 Open) Details
Rapid 4 Smith, J (James) 3 2 1 Strategema Chess Festival 2022 (U11 Boys) Cape Winelands Schools - PS Trials 1 2024 (U13 Boys) Details
Rapid 5 Damane, L (Lukhanyo) 3 2 1 Cape Town Junior League 2nd Qualifier 2023 (U12) Cape Town Junior Chess League Finals 2023 (U12A) Details