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: 2024/05/05 (8 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
Curent Raw rating1604.1
Curent Weighted rating1567.4
Curent Weighted performance1486.3
Current official/published rating (highest between Raw, WR and WP)1604.1
Current floor (min rating allowed)1138.6
Current highest rating achieved1638.6
Current K-factor28
Games played this month6
Score (S)4.0
Expected score (We)4.44
Difference (S-We)-0.44
Current Raw change (no limits, including tournament time weight)-10.2
Current min/max change allowed (with limits)±93.2
Current Raw change used (final)-10.2
Projected new Raw rating1593.9
Projected new Weighed rating1573.3
Projected new Weighted performance1486.3
Projected new official/published rating (highest between new Raw, new WR and new WP)1593.9
Projected effective change (new Official - current Official)-10.2
Projected new highest rating1638.6
Projected new floor1138.6
Projected new K-facor28
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
Curent Raw rating1512.8
Curent Weighted rating1489.6
Curent Weighted performance1449.2
Current official/published rating (highest between Raw, WR and WP)1512.8
Current floor (min rating allowed)1028.5
Current highest rating achieved1528.5
Current K-factor32
Games played this month6
Score (S)4.0
Expected score (We)3.94
Difference (S-We)0.06
Current Raw change (no limits, including tournament time weight)1.9
Current min/max change allowed (with limits)±106.2
Current Raw change used (final)1.9
Projected new Raw rating1514.7
Projected new Weighed rating1494.5
Projected new Weighted performance1449.2
Projected new official/published rating (highest between new Raw, new WR and new WP)1514.7
Projected effective change (new Official - current Official)+1.9
Projected new highest rating1528.5
Projected new floor1028.5
Projected new K-facor32
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
Curent Raw rating1639.6
Curent Weighted rating1597.6
Curent Weighted performance1574.6
Current official/published rating (highest between Raw, WR and WP)1639.6
Current floor (min rating allowed)1158.7
Current highest rating achieved1658.7
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)±88.6
Current Raw change used (final)0.0
Projected new Raw rating1639.6
Projected new Weighed rating1603.5
Projected new Weighted performance1574.6
Projected new official/published rating (highest between new Raw, new WR and new WP)1639.6
Projected effective change (new Official - current Official)=0.0
Projected new highest rating1658.7
Projected new floor1158.7
Projected new K-facor28
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
Curent Raw rating1199.2
Curent Weighted rating1199.2
Curent Weighted performance0.0
Current official/published rating (highest between Raw, WR and WP)1199.2
Current floor (min rating allowed)1158.7
Current highest rating achieved1199.2
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 rating1199.2
Projected new Weighted performance0.0
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
Projected new highest rating1199.2
Projected new floor1158.7
Projected new K-facor40
Tournaments
Tournament: Western Cape PS Individuals Championship 2024 (U13 Boys)
Start: 2024/05/04  End: 2024/05/05  Host: WCU  Type: Standard   Time: 60  Time weight: 0.83  Rounds: 6
Games: 6  Score: 4.0
Main rating: 1604.1  Rating gain/loss: -10.2
Type rating: 1512.8  Rating gain/loss: 1.9
Analysis
#TournamentStartEndHostTypeTimeWeightRnsGmsScrMainTypeAnalysis
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
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
30 Langeberg Schools Chess Trials 2023 (U11 Open) 2023/02/11 2023/02/11 Cape Winelands (WCW) Rapid 30 0.60 5 5 5.0 1394.5 1455.9 Analysis
123
Game History
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 32 24 2 6 25.0 78.1 239.1 1324.1 1563.2
White 16 12 0 4 12.0 75.0 212.5 1321.5 1534.0
Black 16 12 2 2 13.0 81.3 265.6 1326.8 1592.4
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 18 15 1 2 15.5 86.1 306.9 1285.3 1592.3
White 9 8 0 1 8.0 88.9 330.6 1296.0 1626.5
Black 9 7 1 1 7.5 83.3 283.3 1274.7 1558.0
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 247 186 8 53 190.0 76.9 228.8 1275.7 1504.5
White 125 93 3 29 94.5 75.6 217.6 1281.4 1499.0
Black 122 93 5 24 95.5 78.3 240.4 1269.8 1510.1
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 111 97 2 12 98.0 88.3 325.5 1260.7 1586.1
White 57 51 0 6 51.0 89.5 335.5 1270.9 1606.4
Black 54 46 2 6 47.0 87.0 314.8 1249.9 1564.7
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 1120140730 Malherbe, J (Jeevan) 3 2.0 2 0 1 66.7 1576.2 141.7 1717.9 View list
14 1120147443 Niemann, J (Jandre) 3 2.0 2 0 1 66.7 1533.5 141.7 1675.1 View list
15 1120109662 Roberts, I (Iwan) 3 2.0 2 0 1 66.7 1313.3 141.7 1455.0 View list
16 1120149749 Cornelius, L (Laythan) 3 1.5 1 1 1 50.0 1550.6 0.0 1550.6 View list
17 1070137714 Lirafu, S (Siyambonga) 3 1.0 1 0 2 33.3 1412.6 -141.7 1270.9 View list
18 1110097140 Milhomem, L (Lucas) 3 1.0 1 0 2 33.3 1403.6 -141.7 1261.9 View list
19 1080140085 Cupido, D (Demetrie) 2 2.0 2 0 0 100.0 1433.3 425.0 1858.3 View list
20 1060133461 De Koker, D (Dillan) 2 2.0 2 0 0 100.0 1432.5 425.0 1857.5 View list