PLAYER PAGE

Mari Grobbelaar

2160158380
Tshwane (GTP)
Personal
Main rating
Rating 1333
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1237
Final +/- 0
New Rating
()
Rating 1333
K-factor 32
Floor 970.3
Highest 1490.2 (2026-01-01)
Min/Max +/- allowed 109.7
Standard rating
Rating 1314.8
K-factor 32
Floor 978
Highest 1488.2 (2026-01-01)
Min/Max +/- allowed 110
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1237
Final +/- 0
New Rating
()
Rating 1314.8
K-factor 32
Floor 978
Highest 1488.2 (2026-01-01)
Min/Max +/- allowed 110
Rapid rating
Rating 1255.4
K-factor 36
Floor 755.4
Highest 1455.5 (2023-09-01)
Min/Max +/- allowed 115.2
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1255.4
K-factor 36
Floor 755.4
Highest 1455.5 (2023-09-01)
Min/Max +/- allowed 115.2
Blitz rating
Rating 1200
K-factor 36
Floor 700
Highest 1200 (2018-10-01)
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 1200
K-factor 36
Floor 700
Highest 1200 (2018-10-01)
Min/Max +/- allowed 165.8
Rating Graph
Tournaments
No tournaments found.
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
# Tournament Type Start End Host Rounds Rating Games Score Perform Rat+/- Details
1 2026 JMCA Open Chess Tournament (U12) Standard 2026-08-15 2026-08-15 Tshwane (GTP) 5 1333 5 2 1134.2 -39.4 Details
2 2026 Etienne Lewis (U12) Standard 2026-08-08 2026-08-10 Tshwane (GTP) 7 1333 6 2.5 1360 -7.5 Details
3 2026 Menlo Open (U12) Standard 2026-07-25 2026-07-25 Tshwane (GTP) 5 1333 5 3 1268.3 -15.2 Details
4 4th Khelo India - LCA Chess Tournament 2026 (E) Standard 2026-07-12 2026-07-12 Johannesburg Metro (GJM) 5 1431.1 5 1.5 1158.7 -36 Details
5 2026 D4 District Individuals (U11 Girls) Standard 2026-05-30 2026-05-30 Tshwane (GTP) 5 1405.3 5 4 1559.2 25.3 Details
6 2026 Milos Ristic Teams Open (Junior) Standard 2026-05-02 2026-05-02 Tshwane (GTP) 5 1399.9 5 3 1441 5.4 Details
7 South African Junior Closed Chess Championship 2026 (U10 Girls) Classical 2026-03-28 2026-04-02 Bojanala Platina (NBR) 9 1372.4 9 4.5 1450.3 27.4 Details
8 2026 Blou Bull Chess Tournament (U12) Standard 2026-02-21 2026-02-21 Tshwane (GTP) 5 1379.2 5 3 1464.8 12.3 Details
9 2026 AHS Chess Tournament (U12) Standard 2026-02-28 2026-02-28 Tshwane (GTP) 5 1379.2 5 2.5 1248.8 -19.1 Details
10 2026 Piet Robbertse Open Chess Tournament (C) Standard 2026-02-07 2026-02-08 Tshwane (GTP) 5 1474.2 5 1 1109 -39.7 Details
11 2026 Tshwane Chess Registration Tournament (U12-2) Standard 2026-01-31 2026-01-31 Tshwane (GTP) 5 1474.2 5 2.5 1287.5 -17.3 Details
12 2025 Mzansi Individual Championships (U10 Girls) Classical 2025-12-17 2025-12-20 Nelson Mandela Bay (ENM) 6 1376.6 6 4 1458.7 11.6 Details
13 2025 Mzansi Inter Provincial Team Championships (U10 Combined) Standard 2025-12-15 2025-12-17 Nelson Mandela Bay (ENM) 6 1376.6 6 4.5 1448 8.5 Details
14 Gauteng Inter-Region at Emerald Resort 2025 (U8+U10 Girls) Standard 2025-12-06 2025-12-07 Sedibeng (GSV) 5 1376.6 5 5 1673.1 32.1 Details
15 2025 Centurion Chess Open Tournament (U10) Standard 2025-09-27 2025-09-27 Tshwane (GTP) 5 1324.7 5 3.5 1628.5 28.9 Details
16 2025 Tshwane South School District CLOSED League Championship (U9A) Standard 2025-08-15 2025-08-15 Tshwane (GTP) 5 1346.3 5 1.5 1260.9 -7.8 Details
17 2025 Etienne Lewis Closed Chess Tournament (U10) Standard 2025-08-08 2025-08-10 Tshwane (GTP) 7 1346.3 7 3.5 1313.2 -4.3 Details
18 2025 Wynie Robbertse Chess Tournament (U10) Standard 2025-07-19 2025-07-19 Tshwane (GTP) 5 1312.9 5 2.5 1283.8 -3.5 Details
19 South African Open 2025 (U10 Girls) Classical 2025-07-03 2025-07-05 Johannesburg Metro (GJM) 5 1312.9 5 4 1506.9 22 Details
20 Third Knight Riders Junior Open 2025 (U10) Standard 2025-06-22 2025-06-22 Johannesburg Metro (GJM) 5 1311.4 5 3 1326.4 0.8 Details
21 2025 Silver Lakes Chess Club Open Chess Tournament (U10) Standard 2025-05-03 2025-05-03 Tshwane (GTP) 5 1311.1 5 2.5 1289.5 -2.8 Details
22 Lubowski Open 2025 (D2) Standard 2025-03-21 2025-03-22 Tshwane (GTP) 5 1355.7 5 3 1302.4 -6.6 Details
23 2025 Chris Greyling Open Chess Tournament (U10) Standard 2025-03-15 2025-03-15 Tshwane (GTP) 5 1355.7 5 1.5 1105.1 -25.1 Details
24 Constantiapark Open 2025 (U10) Standard 2025-02-15 2025-02-15 Tshwane (GTP) 5 1338.3 5 4 1507.3 17.3 Details
25 2025 Blou Bul Open Chess Tournament (D2) Standard 2025-02-08 2025-02-08 Tshwane (GTP) 5 1338.3 5 2 1172.2 -16.8 Details
26 2025 Tshwane Chess OPEN Registration Tournament (U10) Standard 2025-01-25 2025-01-25 Tshwane (GTP) 5 1318.2 5 3 1401.4 8.8 Details
27 Gauteng Inter-Region at UJ 2024 (u10 gIRLS) Standard 2024-12-07 2024-12-08 Johannesburg Metro (GJM) 5 1294.2 5 3 1407.4 13.3 Details
28 Lardies Ope 2024 (U10) Standard 2024-10-26 2024-10-26 Tshwane (GTP) 5 1281.1 5 3 1349.2 7.3 Details
29 2024 Tuks Open Chess Tournament (U10) Standard 2024-09-28 2024-09-28 Tshwane (GTP) 5 1277.4 5 2 1271.3 0.2 Details
30 2024 Etienne Lewis (U10) Standard 2024-08-30 2024-09-01 Tshwane (GTP) 7 1277.4 7 4 1282.9 1.9 Details
31 Menlopark Open Chess Tournament 2024 (U10) Standard 2024-07-13 2024-07-13 Tshwane (GTP) 5 1246.3 5 3.5 1416.3 17.3 Details
32 2024 African Youth Chess Championship Classical 2024-06-16 2024-06-22 Tshwane (GTP) 9 1309.9 9 5 1221.4 -9.6 Details
33 2024 Johannes Mabusela's 40th Birthday Chess Tournament F Section (D) Standard 2024-06-01 2024-06-01 Tshwane (GTP) 5 1309.9 5 2 1049.7 -25.7 Details
34 2024 Tshwane South School District CLOSED Individual Championships (U11 Girls) Standard 2024-05-11 2024-05-11 Tshwane (GTP) 5 1334.2 5 2 1118.6 -20.1 Details
35 South African Junior Closed Chess Championship 2024 (U8 Girls) Classical 2024-04-27 2024-05-01 Ekurhuleni (GE) 9 1334.2 9 6 1369.9 6.6 Details
36 2024 Lubowski Open Chess Tournament (D2) Standard 2024-03-23 2024-03-24 Tshwane (GTP) 5 1353.8 5 3 1260 -10.9 Details
37 2024 Constantiapark Open (E) Standard 2024-02-17 2024-02-17 Tshwane (GTP) 5 1359.2 5 3 1320.6 -3 Details
38 2024 Tshwane Chess OPEN Registration Tournament (E) Standard 2024-01-27 2024-01-27 Tshwane (GTP) 5 1353.2 5 3.5 1323.8 -3.3 Details
39 2024 Gauteng Inter-Region Chess Championship (U8+U10 Girls) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1353.2 4 3 1438.8 6 Details
40 Lardies Open Tournament 2023 (F) Standard 2023-10-28 2023-10-28 Tshwane (GTP) 5 1251.6 5 3 1323.6 7.8 Details
41 2023 Gauteng Noord (F) Standard 2023-10-14 2023-10-14 Tshwane (GTP) 6 1251.6 6 6 1615.6 48.2 Details
42 2023 Centurion Chess Open (E) Standard 2023-09-23 2023-09-23 Tshwane (GTP) 5 1234.8 5 2 1162.6 -6.3 Details
43 2023 U8 Open Chess Tournament Rapid 2023-09-02 2023-09-02 Tshwane (GTP) 5 1234.8 5 4 1447.1 15.6 Details
44 2023 Woman's Day Open Chess Tournament (Pawn) Standard 2023-08-09 2023-08-09 Tshwane (GTP) 5 1219.1 5 3 1351.5 13.6 Details
45 2023 Etienne Lewis Closed Tournament (U8) Standard 2023-08-26 2023-08-26 Tshwane (GTP) 6 1219.1 5 2 1171.3 -4.5 Details
46 2023 Menlo Open Tournament (F) Standard 2023-07-22 2023-07-22 Tshwane (GTP) 5 1200 5 3 1316.9 10.6 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 60
Wins 26
Draws 7
Losses 27
White 28
Black 32
White wins 11
Black wins 15
Score 29.5
Percent 49.2
Dp -7.1
AOR 1333.2
Performance 1326.2
Game statistics (History)
Games 249
Wins 134
Draws 18
Losses 97
White 122
Black 127
White wins 67
Black wins 67
Score 143
Percent 57.4
Dp 63.2
AOR 1273
Performance 1336.1
Rankings (Main)
National
Overall 5173
Gender 884
Age group 535
Gender/Age 118
Provincial
Overall 1766
Gender 299
Age group 187
Gender/Age 36
Regional
Overall 600
Gender 104
Age group 61
Gender/Age 16
Rankings (Standard)
National
Overall 5109
Gender 938
Age group 568
Gender/Age 133
Provincial
Overall 1823
Gender 324
Age group 202
Gender/Age 41
Regional
Overall 638
Gender 112
Age group 72
Gender/Age 16
Rankings (Rapid)
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
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 60
Score 29.5
Percent 49.2
Aor 1333.2
Dp -7.1
Prat 1326.2
Performance (12 months)
Games 82
Score 46.5
Percent 56.7
Aor 1327.4
Dp 57
Prat 1384.4
Performance (History)
Games 249
Score 143
Percent 57.4
Aor 1273
Dp 63.2
Prat 1336.1
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Westermann, Z (Zelri) 7 1 6 2023 Gauteng Noord (F) 2026 AHS Chess Tournament (U12) Details
Overall 2 Barkhuizen, RJ (Reuben Joshua) 5 2 3 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane Chess OPEN Registration Tournament (U10) Details
Overall 3 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details
Overall 4 Dixon, G (Genevieve) 4 3 1 2024 Tuks Open Chess Tournament (U10) 2026 D4 District Individuals (U11 Girls) Details
Overall 5 Rocher, G (Gideon) 4 3 1 2023 Menlo Open Tournament (F) Lardies Open Tournament 2023 (F) Details
Standard 1 Westermann, Z (Zelri) 7 1 6 2023 Gauteng Noord (F) 2026 AHS Chess Tournament (U12) Details
Standard 2 Barkhuizen, RJ (Reuben Joshua) 5 2 3 2023 Etienne Lewis Closed Tournament (U8) 2025 Tshwane Chess OPEN Registration Tournament (U10) Details
Standard 3 Nawrattel, A (Abigail) 4 1 3 2023 Gauteng Noord (F) 2025 Wynie Robbertse Chess Tournament (U10) Details
Standard 4 Dixon, G (Genevieve) 4 3 1 2024 Tuks Open Chess Tournament (U10) 2026 D4 District Individuals (U11 Girls) Details
Standard 5 Rocher, G (Gideon) 4 3 1 2023 Menlo Open Tournament (F) Lardies Open Tournament 2023 (F) Details