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: 2024/10/19 (33 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 rating1616.7
Current Weighted rating1597.7
Current Weighted performance1544.7
Current official/published rating (highest between Raw, WR and WP)1616.7
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)±91.6
Current Raw change used (final)0.0
Projected new Raw rating1616.7
Projected new Weighed rating1472.1
Projected new Weighted performance1544.7
Projected new final Raw rating (if new WP > new Raw)1616.7
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)1616.7
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 rating1585.1
Current Weighted rating1516.5
Current Weighted performance1574.2
Current official/published rating (highest between Raw, WR and WP)1585.1
Current highest rating achieved1585.1
Current floor (min rating allowed)1085.1
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)±95.8
Current Raw change used (final)0.0
Projected new Raw rating1585.1
Projected new Weighed rating1396.8
Projected new Weighted performance1574.2
Projected new final Raw rating (if new WP > new Raw)1585.1
Projected new highest rating1585.1
Projected new floor1085.1
Projected new K-facor32
Projected new official/published rating (highest between new Raw, new WR and new WP)1585.1
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 rating1592.6
Current Weighted rating1623.1
Current Weighted performance1486.7
Current official/published rating (highest between Raw, WR and WP)1623.1
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)±94.8
Current Raw change used (final)0.0
Projected new Raw rating1592.6
Projected new Weighed rating1495.4
Projected new Weighted performance1486.7
Projected new final Raw rating (if new WP > new Raw)1592.6
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)1592.6
Projected effective change (new Official - current Official)-30.5
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 performance337.1
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
10 Worcester Knock-Out 2024 (U13 Boys) 2024/10/19 2024/10/19 Cape Winelands (WCW) Rapid 30 0.60 6 6 4.0 1599.1 1636.0 Analysis
9 Strategema Chess October 2024 (U13) 2024/10/05 2024/10/05 Cape Winelands (WCW) Standard 60 0.83 5 5 5.0 1599.1 1526.5 Analysis
8 De Villiers PS Tournament 2024 (U14) 2024/08/17 2024/08/17 Cape Winelands (WCW) Standard 60 0.83 5 5 4.5 1600.3 1514.7 Analysis
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
53 Worcester Knock-Out 2024 (U13 Boys) 2024/10/19 2024/10/19 Cape Winelands (WCW) Rapid 30 0.60 6 6 4.0 1599.1 1636.0 Analysis
52 Strategema Chess October 2024 (U13) 2024/10/05 2024/10/05 Cape Winelands (WCW) Standard 60 0.83 5 5 5.0 1599.1 1526.5 Analysis
51 De Villiers PS Tournament 2024 (U14) 2024/08/17 2024/08/17 Cape Winelands (WCW) Standard 60 0.83 5 5 4.5 1600.3 1514.7 Analysis
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
123
Game History
Colour Games Wins Draws Losses Score % Dp Aor Perform
Main All 52 40 3 9 41.5 79.8 253.4 1336.0 1589.4
White 26 22 0 4 22.0 84.6 294.2 1325.3 1619.6
Black 26 18 3 5 19.5 75.0 212.5 1346.7 1559.2
Standard All 24 18 2 4 19.0 79.2 247.9 1355.4 1603.3
White 12 9 0 3 9.0 75.0 212.5 1341.5 1554.0
Black 12 9 2 1 10.0 83.3 283.3 1369.3 1652.6
Rapid All 28 22 1 5 22.5 80.4 258.0 1319.4 1577.5
White 14 13 0 1 13.0 92.9 364.3 1311.5 1675.8
Black 14 9 1 4 9.5 67.9 151.8 1327.4 1479.2
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 267 202 9 56 206.5 77.3 232.4 1281.6 1514.0
White 135 103 3 29 104.5 77.4 233.0 1285.1 1518.1
Black 132 99 6 27 102.0 77.3 231.8 1278.0 1509.8
Standard All 142 96 7 39 99.5 70.1 170.6 1286.6 1457.2
White 71 46 3 22 47.5 66.9 143.7 1288.0 1431.7
Black 71 50 4 17 52.0 73.2 197.5 1285.3 1482.8
Rapid All 121 104 2 15 105.0 86.8 312.6 1270.6 1583.2
White 62 56 0 6 56.0 90.3 342.7 1276.4 1619.2
Black 59 48 2 9 49.0 83.1 280.9 1264.5 1545.4
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 1120140966 Smith, J (James) 4 4.0 4 0 0 100.0 1525.2 425.0 1950.2 View list
4 1120137709 Van Zyl, A (Andre) 4 4.0 4 0 0 100.0 1446.9 425.0 1871.9 View list
5 1130139478 Barends, R (Reece) 3 3.0 3 0 0 100.0 1450.0 425.0 1875.0 View list
6 1120147432 Damane, L (Lukhanyo) 3 3.0 3 0 0 100.0 1533.5 425.0 1958.5 View list
7 1110137706 Eyssen, M (Marchiano) 3 3.0 3 0 0 100.0 1444.9 425.0 1869.9 View list
8 1130116442 Grove, T (Tyler) 3 3.0 3 0 0 100.0 1533.5 425.0 1958.5 View list
9 1120106118 Hanekom, R (Ricus) 3 3.0 3 0 0 100.0 1263.2 425.0 1688.2 View list
10 1120137461 Januarie, L (Lee-Roy) 3 3.0 3 0 0 100.0 1437.4 425.0 1862.4 View list
11 2110119366 Kirchner, M (Miya) 3 3.0 3 0 0 100.0 1558.1 425.0 1983.1 View list
12 1130139482 Koert, D (Dane) 3 3.0 3 0 0 100.0 1549.7 425.0 1974.7 View list
13 1110108726 Small, Q (Quade) 3 3.0 3 0 0 100.0 1471.4 425.0 1896.4 View list
14 1120119459 Brink, A (Andrew) 3 2.5 2 1 0 83.3 1595.7 283.3 1879.1 View list
15 1120140730 Malherbe, J (Jeevan) 3 2.0 2 0 1 66.7 1576.2 141.7 1717.9 View list
16 1120147443 Niemann, J (Jandre) 3 2.0 2 0 1 66.7 1533.5 141.7 1675.1 View list
17 1120109662 Roberts, I (Iwan) 3 2.0 2 0 1 66.7 1313.3 141.7 1455.0 View list
18 1110149801 Vanana, L (Libongile) 3 2.0 2 0 1 66.7 1607.2 141.7 1748.9 View list
19 1120149749 Cornelius, L (Laythan) 3 1.5 1 1 1 50.0 1550.6 0.0 1550.6 View list
20 1070137714 Lirafu, S (Siyambonga) 3 1.0 1 0 2 33.3 1412.6 -141.7 1270.9 View list