Player Page

Robertson, J (Jonah)
Dob: 2012/05/07 (U14)
Gender: Male
Chess SA id: 1120112288
FIDE id:
Region: Cape Winelands (WCW)
Citizen: RSA
Title(s):
Last active: 2024/06/08 (38 days ago)
Ratings
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1600.3
Current Weighted rating1579.2
Current Weighted performance1509.1
Current official/published rating (highest between Raw, WR and WP)1600.3
Current highest rating achieved1638.6
Current floor (min rating allowed)1138.6
Current K-factor28
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±93.7
Current Raw change used (final)0.0
Projected new Raw rating1600.3
Projected new Weighed rating1456.5
Projected new Weighted performance1509.1
Projected new final Raw rating (if new WP > new Raw)1600.3
Projected new highest rating1638.6
Projected new floor1138.6
Projected new K-facor28
Projected new official/published rating (highest between new Raw, new WR and new WP)1600.3
Projected effective change (new Official - current Official)=0.0
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1514.7
Current Weighted rating1498.8
Current Weighted performance1475.6
Current official/published rating (highest between Raw, WR and WP)1514.7
Current highest rating achieved1528.5
Current floor (min rating allowed)1028.5
Current K-factor32
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±105.9
Current Raw change used (final)0.0
Projected new Raw rating1514.7
Projected new Weighed rating1381.5
Projected new Weighted performance1475.6
Projected new final Raw rating (if new WP > new Raw)1514.7
Projected new highest rating1528.5
Projected new floor1028.5
Projected new K-facor32
Projected new official/published rating (highest between new Raw, new WR and new WP)1514.7
Projected effective change (new Official - current Official)=0.0
s
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1636.0
Current Weighted rating1608.9
Current Weighted performance1573.1
Current official/published rating (highest between Raw, WR and WP)1636.0
Current highest rating achieved1658.7
Current floor (min rating allowed)1158.7
Current K-factor28
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±89.1
Current Raw change used (final)0.0
Projected new Raw rating1636.0
Projected new Weighed rating1483.1
Projected new Weighted performance1573.1
Projected new final Raw rating (if new WP > new Raw)1636.0
Projected new highest rating1658.7
Projected new floor1158.7
Projected new K-facor28
Projected new official/published rating (highest between new Raw, new WR and new WP)1636.0
Projected effective change (new Official - current Official)=0.0
Raw rating=Current rating, Weighted rating (WR)=Weighted average of current/new Raw rating + last 23 published Raw ratings), Weighted performance (WP)=Weighted average of last 5 tournaments
Current Raw rating1199.2
Current Weighted rating1199.2
Current Weighted performance
Current official/published rating (highest between Raw, WR and WP)1199.2
Current highest rating achieved1199.2
Current floor (min rating allowed)699.2
Current K-factor40
Games played this month0
Score (S)0.0
Expected score (We)0.00
Difference (S-We)0.00
Current Raw change (no limits, including tournament time weight)0.0
Current min/max change allowed (with limits)±166.0
Current Raw change used (final)0.0
Projected new Raw rating1199.2
Projected new Weighed rating1103.3
Projected new Weighted performance358.1
Projected new final Raw rating (if new WP > new Raw)1199.2
Projected new highest rating1199.2
Projected new floor699.2
Projected new K-facor40
Projected new official/published rating (highest between new Raw, new WR and new WP)1199.2
Projected effective change (new Official - current Official)=0.0
Tournaments
Did not participate this month.
#TournamentStartEndHostTypeTimeWeightRnsGmsScrMainTypeAnalysis
7 Western Cape - Kings and Queens 2024 (Boys) 2024/06/08 2024/06/08 Overberg (WOS) Rapid 30 0.60 5 4 3.0 1593.9 1639.6 Analysis
6 Western Cape PS Individuals Championship 2024 (U13 Boys) 2024/05/04 2024/05/05 West Coast (WCU) Standard 60 0.83 6 6 4.0 1604.1 1512.8 Analysis
5 Western Cape Inter Region Cup 2024 (U14 Boys) 2024/03/23 2024/03/24 Overberg (WOS) Standard 90 0.94 5 3 1.5 1618.5 1528.5 Analysis
4 Brave Knights 2024 (U13) 2024/03/16 2024/03/16 Cape Winelands (WCW) Rapid 30 0.60 6 6 6.0 1618.5 1627.6 Analysis
3 Cape Winelands Schools - Prestige 2024 (U13 Boys) 2024/03/02 2024/03/02 Cape Winelands (WCW) Standard 60 0.83 5 5 4.0 1618.5 1528.5 Analysis
2 Cape Winelands Schools - PS Trials 1 2024 (U13 Boys) 2024/02/10 2024/02/10 Cape Winelands (WCW) Rapid 35 0.66 6 6 4.5 1630.0 1646.9 Analysis
1 Cape Winelands - Marie Delport Memorial 2024 (U14) 2024/01/27 2024/01/27 Cape Winelands (WCW) Rapid 20 0.47 6 6 5.0 1632.6 1658.7 Analysis
#TournamentStartEndHostTypeTimeWeightRoundsGamesScoreMainTypeAnalysis
50 Western Cape - Kings and Queens 2024 (Boys) 2024/06/08 2024/06/08 Overberg (WOS) Rapid 30 0.60 5 4 3.0 1593.9 1639.6 Analysis
49 Western Cape PS Individuals Championship 2024 (U13 Boys) 2024/05/04 2024/05/05 West Coast (WCU) Standard 60 0.83 6 6 4.0 1604.1 1512.8 Analysis
48 Western Cape Inter Region Cup 2024 (U14 Boys) 2024/03/23 2024/03/24 Overberg (WOS) Standard 90 0.94 5 3 1.5 1618.5 1528.5 Analysis
47 Brave Knights 2024 (U13) 2024/03/16 2024/03/16 Cape Winelands (WCW) Rapid 30 0.60 6 6 6.0 1618.5 1627.6 Analysis
46 Cape Winelands Schools - Prestige 2024 (U13 Boys) 2024/03/02 2024/03/02 Cape Winelands (WCW) Standard 60 0.83 5 5 4.0 1618.5 1528.5 Analysis
45 Cape Winelands Schools - PS Trials 1 2024 (U13 Boys) 2024/02/10 2024/02/10 Cape Winelands (WCW) Rapid 35 0.66 6 6 4.5 1630.0 1646.9 Analysis
44 Cape Winelands - Marie Delport Memorial 2024 (U14) 2024/01/27 2024/01/27 Cape Winelands (WCW) Rapid 20 0.47 6 6 5.0 1632.6 1658.7 Analysis
43 2023 Western Cape Rural Cup (U12) 2023/12/09 2023/12/10 Cape Winelands (WCW) Standard 60 0.83 5 4 2.5 1638.6 1525.0 Analysis
42 Ashton Skaakmat Rapid 2023 (U11) 2023/11/18 2023/11/18 Cape Winelands (WCW) Rapid 30 0.60 6 6 6.0 1616.1 1630.1 Analysis
41 Bonnievale Open Rapid 2023 (U12) 2023/10/21 2023/10/21 Cape Winelands (WCW) Rapid 25 0.54 6 6 6.0 1586.9 1595.4 Analysis
40 Cape Town Junior Chess League Finals 2023 (U12A) 2023/09/16 2023/09/16 Cape Town (WCT) Rapid 25 0.54 7 7 6.0 1554.7 1604.9 Analysis
39 Western Cape Top Schools 2023 (U11 Mixed) 2023/09/02 2023/09/03 Cape Winelands (WCW) Standard 60 0.83 6 5 4.0 1554.7 1470.9 Analysis
38 CW Top Schools 2023 (U7-U11 Mixed + U11 Girls) 2023/08/26 2023/08/26 Cape Winelands (WCW) Rapid 32 0.63 5 5 4.0 1555.7 1622.0 Analysis
37 Langeberg Top Schools 2023 (U7-U13 Mix) 2023/07/29 2023/07/29 Cape Winelands (WCW) Rapid 30 0.60 5 5 5.0 1531.6 1557.6 Analysis
36 Cape Town Junior Chess League - Round 1 2023 (U12A) 2023/07/22 2023/07/22 Cape Town (WCT) Rapid 25 0.54 7 6 5.0 1531.6 1557.6 Analysis
35 Cape Town Junior League 2nd Qualifier 2023 (U12) 2023/06/03 2023/06/03 Cape Town (WCT) Rapid 25 0.54 6 6 6.0 1514.1 1531.7 Analysis
34 Western Cape PS Individuals 2023 (U11 Boys) 2023/05/05 2023/05/06 Cape Town (WCT) Standard 60 0.83 6 6 4.0 1541.5 1498.1 Analysis
33 Cape Winelands Schools Prestige 2023 (U11 Boys) 2023/03/11 2023/03/11 Cape Winelands (WCW) Standard 60 0.83 5 5 5.0 1466.1 1394.4 Analysis
32 CWIS Inaugural Chess Championships 2023 2023/03/04 2023/03/04 Cape Winelands (WCW) Rapid 10 0.29 5 5 5.0 1466.1 1499.1 Analysis
31 Cape Winelands Schools Chess - Trials 1 2023 (U11 Boys) 2023/02/18 2023/02/18 Cape Winelands (WCW) Standard 60 0.83 5 5 4.0 1394.5 1380.4 Analysis
123
Game History
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 36 27 2 7 28.0 77.8 236.1 1339.5 1575.6
White 18 14 0 4 14.0 77.8 236.1 1337.2 1573.3
Black 18 13 2 3 14.0 77.8 236.1 1341.7 1577.8
Standard All 14 9 1 4 9.5 67.9 151.8 1374.0 1525.7
White 7 4 0 3 4.0 57.1 60.7 1354.3 1415.0
Black 7 5 1 1 5.5 78.6 242.9 1393.7 1636.5
Rapid All 22 18 1 3 18.5 84.1 289.8 1317.5 1607.3
White 11 10 0 1 10.0 90.9 347.7 1326.4 1674.1
Black 11 8 1 2 8.5 77.3 231.8 1308.6 1540.4
Blitz All 0 0 0 0 0.0 0.0 0.0 0.0 0.0
White 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Black 0 0 0 0 0.0 0.0 0.0 0.0 0.0
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 251 189 8 54 193.0 76.9 228.6 1278.6 1507.2
White 127 95 3 29 96.5 76.0 220.9 1284.3 1505.1
Black 124 94 5 25 96.5 77.8 236.5 1272.9 1509.3
Standard All 132 87 6 39 90.0 68.2 154.5 1283.4 1438.0
White 66 41 3 22 42.5 64.4 122.3 1285.3 1407.7
Black 66 46 3 17 47.5 72.0 186.7 1281.5 1468.3
Rapid All 115 100 2 13 101.0 87.8 321.5 1267.7 1589.2
White 59 53 0 6 53.0 89.8 338.6 1277.4 1616.0
Black 56 47 2 7 48.0 85.7 303.6 1257.5 1561.0
Blitz All 4 2 0 2 2.0 50.0 0.0 1435.6 1435.6
White 2 1 0 1 1.0 50.0 0.0 1452.8 1452.8
Black 2 1 0 1 1.0 50.0 0.0 1418.4 1418.4
Top 20 opponents most often played
#Chess SA idNameGamesScoreWinsDrawsLosses%AorDpPerformView
1 2120112287 Lukas, J (Janeva) 7 7.0 7 0 0 100.0 1389.2 425.0 1814.2 View list
2 1120108724 Goosen, J (Jeandre) 4 4.0 4 0 0 100.0 1299.7 425.0 1724.7 View list
3 1120137709 Van Zyl, A (Andre) 4 4.0 4 0 0 100.0 1446.9 425.0 1871.9 View list
4 1130139478 Barends, R (Reece) 3 3.0 3 0 0 100.0 1450.0 425.0 1875.0 View list
5 1120147432 Damane, L (Lukhanyo) 3 3.0 3 0 0 100.0 1533.5 425.0 1958.5 View list
6 1110137706 Eyssen, M (Marchiano) 3 3.0 3 0 0 100.0 1444.9 425.0 1869.9 View list
7 1130116442 Grove, T (Tyler) 3 3.0 3 0 0 100.0 1533.5 425.0 1958.5 View list
8 1120106118 Hanekom, R (Ricus) 3 3.0 3 0 0 100.0 1263.2 425.0 1688.2 View list
9 1120137461 Januarie, L (Lee-Roy) 3 3.0 3 0 0 100.0 1437.4 425.0 1862.4 View list
10 1130139482 Koert, D (Dane) 3 3.0 3 0 0 100.0 1549.7 425.0 1974.7 View list
11 1110108726 Small, Q (Quade) 3 3.0 3 0 0 100.0 1471.4 425.0 1896.4 View list
12 1120140966 Smith, J (James) 3 3.0 3 0 0 100.0 1500.6 425.0 1925.6 View list
13 1120119459 Brink, A (Andrew) 3 2.5 2 1 0 83.3 1595.7 283.3 1879.1 View list
14 1120140730 Malherbe, J (Jeevan) 3 2.0 2 0 1 66.7 1576.2 141.7 1717.9 View list
15 1120147443 Niemann, J (Jandre) 3 2.0 2 0 1 66.7 1533.5 141.7 1675.1 View list
16 1120109662 Roberts, I (Iwan) 3 2.0 2 0 1 66.7 1313.3 141.7 1455.0 View list
17 1120149749 Cornelius, L (Laythan) 3 1.5 1 1 1 50.0 1550.6 0.0 1550.6 View list
18 1070137714 Lirafu, S (Siyambonga) 3 1.0 1 0 2 33.3 1412.6 -141.7 1270.9 View list
19 1110097140 Milhomem, L (Lucas) 3 1.0 1 0 2 33.3 1403.6 -141.7 1261.9 View list
20 1120113687 Prinsloo, L (Lyle) 3 0.0 0 0 3 0.0 1540.7 -425.0 1115.7 View list