Chess South Africa
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Chess South Africa
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
The
Projected values
below are
NOT
the actual and official values as calculated by the Ratings Bureau.
Main
Standard
Rapid
Blitz
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 rating
1604.1
Curent Weighted rating
1567.4
Curent Weighted performance
1486.3
Current official/published rating (highest between Raw, WR and WP)
1604.1
Current floor (min rating allowed)
1138.6
Current highest rating achieved
1638.6
Current K-factor
28
Games played this month
6
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 rating
1593.9
Projected new Weighed rating
1573.3
Projected new Weighted performance
1486.3
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 rating
1638.6
Projected new floor
1138.6
Projected new K-facor
28
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 rating
1512.8
Curent Weighted rating
1489.6
Curent Weighted performance
1449.2
Current official/published rating (highest between Raw, WR and WP)
1512.8
Current floor (min rating allowed)
1028.5
Current highest rating achieved
1528.5
Current K-factor
32
Games played this month
6
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 rating
1514.7
Projected new Weighed rating
1494.5
Projected new Weighted performance
1449.2
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 rating
1528.5
Projected new floor
1028.5
Projected new K-facor
32
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 rating
1639.6
Curent Weighted rating
1597.6
Curent Weighted performance
1574.6
Current official/published rating (highest between Raw, WR and WP)
1639.6
Current floor (min rating allowed)
1158.7
Current highest rating achieved
1658.7
Current K-factor
28
Games played this month
0
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 rating
1639.6
Projected new Weighed rating
1603.5
Projected new Weighted performance
1574.6
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 rating
1658.7
Projected new floor
1158.7
Projected new K-facor
28
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 rating
1199.2
Curent Weighted rating
1199.2
Curent Weighted performance
0.0
Current official/published rating (highest between Raw, WR and WP)
1199.2
Current floor (min rating allowed)
1158.7
Current highest rating achieved
1199.2
Current K-factor
40
Games played this month
0
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 rating
1199.2
Projected new Weighed rating
1199.2
Projected new Weighted performance
0.0
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 rating
1199.2
Projected new floor
1158.7
Projected new K-facor
40
Tournaments
History
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
#
Tournament
Start
End
Host
Type
Time
Weight
Rns
Gms
Scr
Main
Type
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
#
Tournament
Start
End
Host
Type
Time
Weight
Rounds
Games
Score
Main
Type
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
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
1
2
3
Game History
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 id
Name
Games
Score
Wins
Draws
Losses
%
Aor
Dp
Perform
View
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