Surname or Chess SA id..
Chess SA Region AOC Mzansi 2026

PLAYER PAGE

Yu Bo (David) Weng

1100117290
Ethekwini (KED)
Personal
Main rating
Rating 1870.5
K-factor 24
Floor 1370.5
Highest 1870.5 (2026-08-01)
Min/Max +/- allowed 64
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1839.3
Final +/- 0
New Rating
()
Rating 1870.5
K-factor 24
Floor 1370.5
Highest 1870.5 (2026-08-01)
Min/Max +/- allowed 63.8
Standard rating
Rating 1850.5
K-factor 24
Floor 1350.5
Highest 1850.5 (2026-08-01)
Min/Max +/- allowed 65.6
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1809.7
Final +/- 0
New Rating
()
Rating 1850.5
K-factor 24
Floor 1350.5
Highest 1850.5 (2026-08-01)
Min/Max +/- allowed 65.6
Rapid rating
Rating 1585
K-factor 32
Floor 1085
Highest 1585 (2026-06-01)
Min/Max +/- allowed 95.8
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 1591.9
Final +/- 0
New Rating
()
Rating 1585
K-factor 32
Floor 1085
Highest 1585 (2026-06-01)
Min/Max +/- allowed 95.8
Blitz rating
Rating 1352.2
K-factor 36
Floor 852.2
Highest 1371.6 (2023-07-01)
Min/Max +/- allowed 129.9
Rating Change
()
Games 0
Score 0
We 0
SWe 0
Temp +/- 0
Penalties 0
Weight perform 0
Final +/- 0
New Rating
()
Rating 1352.2
K-factor 36
Floor 852.2
Highest 1371.6 (2023-07-01)
Min/Max +/- allowed 129.9
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 Mandela 67 Chess Tournament (Open) Standard 2026-07-18 2026-07-19 iLembe (KIK) 6 1864.4 6 5 1984.3 16 Details
2 2026 KwaZulu Natal Closed Championship (U18) Standard 2026-06-27 2026-06-28 Ethekwini (KED) 5 1864.4 5 4 1681.1 -9.9 Details
3 2026 Umhlanga April Rapid Rapid 2026-04-18 2026-04-18 Ethekwini (KED) 5 1796.4 5 5 2028.2 23.2 Details
4 2026 KwaZulu Natal Open (A) Standard 2026-05-01 2026-05-03 Ethekwini (KED) 7 1796.4 7 5 2009 44.8 Details
5 2026 Umhlanga CC (Open) Standard 2026-03-21 2026-03-22 Ethekwini (KED) 6 1785.6 6 4.5 1828.4 10.8 Details
6 2025 Umhlanga Heritage Open (Open) Standard 2025-09-27 2025-09-27 Ethekwini (KED) 5 1782.7 4 2 1673.9 -8 Details
7 2025 KZN Provincial Trials (U16) Rapid 2025-09-06 2025-09-06 Ethekwini (KED) 6 1782.7 6 6 1864.5 10.2 Details
8 2025 ECA 2nd Youth Trials (U16) Standard 2025-07-26 2025-07-27 Ethekwini (KED) 6 1715.4 6 5 1654.4 -5 Details
9 2025 Umhlanga Youth Open (High School) Standard 2025-07-12 2025-07-13 Ethekwini (KED) 6 1715.4 6 5.5 1927.3 25.2 Details
10 South African Open 2025 (B) Classical 2025-06-28 2025-07-05 Johannesburg Metro (GJM) 11 1715.4 11 7.5 1807.8 26.2 Details
11 South African Open 2025 (Blitz) Blitz 2025-07-02 2025-07-02 Johannesburg Metro (GJM) 9 1715.4 8 4 1757.2 1.6 Details
12 2025 KZN Open (A) Standard 2025-05-02 2025-05-04 Ethekwini (KED) 7 1690.7 7 4 1804.6 17.6 Details
13 Gauteng Inter-Region at UJ 2024 (U16 Open) Standard 2024-12-07 2024-12-08 Johannesburg Metro (GJM) 5 1651.5 5 5 1910.2 28 Details
14 Knight Riders Spring Chess Tournament 2024 (A) Standard 2024-09-28 2024-09-28 Johannesburg Metro (GJM) 5 1691 5 3 1680.6 -0.3 Details
15 Centurion Chess Open Tournament 2024 (A) Standard 2024-09-21 2024-09-21 Tshwane (GTP) 5 1691 5 1 1412.4 -27.9 Details
16 2024 Jacaranda Round Robin Open Chess Tournament (A) Standard 2024-08-17 2024-08-17 Tshwane (GTP) 5 1685 5 2.5 1797.5 10.1 Details
17 CPH King David Linksfield Aug Rapid 2024 (A) Rapid 2024-08-18 2024-08-18 Johannesburg Metro (GJM) 5 1685 5 3.5 1564.4 -5.9 Details
18 JMC Trinityhouse Randpark Ridge 2024 (A) Standard 2024-07-13 2024-07-13 Johannesburg Metro (GJM) 5 1698.6 5 1 1496.1 -19.1 Details
19 JMC NG Weltevreden Church 2024 Rapid 2024-06-29 2024-06-29 Johannesburg Metro (GJM) 7 1698.6 7 4 1770.5 4.9 Details
20 2024 Prestige College Open Chess Tournament (A) Standard 2024-07-06 2024-07-06 Tshwane (GTP) 5 1698.6 5 3 1750.9 4.5 Details
21 Chess Power House June Open 2024 (A) Standard 2024-06-23 2024-06-23 Ekurhuleni (GE) 5 1698.1 5 1.5 1744.9 0.3 Details
22 2024 KSNG CHess Academy Open Tournament (A) Standard 2024-04-06 2024-04-06 Tshwane (GTP) 5 1689 5 3 1746.3 6.5 Details
23 2024 Gauteng Inter-Region Chess Championship (U14A) Standard 2024-01-13 2024-01-14 Tshwane (GTP) 5 1652.2 5 5 1880.3 26.3 Details
24 Africawide Chess Championship 2023 (Open) Standard 2023-11-03 2023-11-05 Johannesburg Metro (GJM) 7 1655.1 7 4 1646.6 -2.1 Details
25 JMC Closed Aug 2023 (U14) Standard 2023-08-04 2023-08-06 Johannesburg Metro (GJM) 6 1608 6 6 1902.4 39.2 Details
26 Chess Power House 2023 (B) Standard 2023-08-19 2023-08-19 Johannesburg Metro (GJM) 5 1608 4 3 1542.8 -5.4 Details
27 2023 Menlo Open Tournament (B) Standard 2023-07-22 2023-07-22 Tshwane (GTP) 5 1550 5 4 1799 25.1 Details
28 JMC - The Higher Ground Restaurant 2nd Blitz Event 2023 Blitz 2023-07-30 2023-07-30 Johannesburg Metro (GJM) 7 1550 7 5 1668.1 4.6 Details
29 3rd Knight Riders Junior Open 2023 (U14+U16) Standard 2023-07-29 2023-07-29 Johannesburg Metro (GJM) 5 1550 5 4.5 1608.9 6.8 Details
30 2023 South African Junior Closed Chess Championships (U14 Open) Classical 2023-03-31 2023-04-04 Chess South Africa (CSA) 9 1543.9 9 5 1557.4 3.8 Details
31 JMC 1 St Peters 2023 (B) Standard 2023-03-18 2023-03-18 Johannesburg Metro (GJM) 5 1559.8 5 3 1464.4 -9.8 Details
32 2022 South African Junior Wild Card Chess Championships (U14 Open) Classical 2022-12-09 2022-12-12 4 Knights (4K) 7 1449.1 7 5.5 1647.6 32 Details
33 2022 South African Junior Team Chess Championships (U14 Open) Classical 2022-12-04 2022-12-08 4 Knights (4K) 7 1449.1 7 6 1657.2 35.2 Details
34 2022 South Africa Junior Blitz Chess Championships (U14) Blitz 2022-12-05 2022-12-05 4 Knights (4K) 7 1449.1 7 4 1502.4 1.7 Details
35 FNB Chessheroes Anity Bullying 2022 (U14) Standard 2022-11-05 2022-11-05 Johannesburg Metro (GJM) 5 1461.3 5 3 1374.1 -7.6 Details
36 Mzansi Spring Open 2022 (Advanced) Standard 2022-09-03 2022-09-03 Johannesburg Metro (GJM) 5 1464.7 5 3 1405.5 -6.3 Details
37 JMC 3rd Trials 2022 (B) Standard 2022-09-11 2022-09-11 Johannesburg Metro (GJM) 5 1464.7 5 3 1388.9 -8 Details
38 Chess Molecules Championship 2022 (U13) Rapid 2022-09-17 2022-09-17 Johannesburg Metro (GJM) 5 1464.7 5 4.5 1629.2 12.3 Details
39 UJ Fundraising Tournament 2022 (C) Standard 2022-08-13 2022-08-13 Johannesburg Metro (GJM) 5 1403.9 5 3 1267 -12.6 Details
40 JMC Womens Day 2022 (C) Standard 2022-08-06 2022-08-07 Johannesburg Metro (GJM) 6 1403.9 6 6 1755.5 46.7 Details
41 JMC 2nd Trials 2022 (B) Standard 2022-08-27 2022-08-27 Johannesburg Metro (GJM) 5 1403.9 5 3 1435.6 3.8 Details
42 JMC Trials 1 - Laerskool Fontainebleau 2022 (U14) Standard 2022-07-24 2022-07-24 Johannesburg Metro (GJM) 5 1290 5 3 1413.7 11.3 Details
43 Alberton Chess Club Open 2022 (D) Standard 2022-07-16 2022-07-16 Ekurhuleni (GE) 5 1290 5 4.5 1515.7 22.9 Details
44 Chess Power House Rapid 2022 (B) Rapid 2022-06-11 2022-06-11 Johannesburg Metro (GJM) 5 1265.1 5 4 1505.5 13.8 Details
45 2022 Mid Gauteng Open (D) Standard 2022-05-07 2022-05-07 Tshwane (GTP) 5 1163.5 5 5 1621.1 44 Details
46 2022 Silver Lakes Chess Club Open Chess Tournament (D) Standard 2022-05-14 2022-05-14 Tshwane (GTP) 5 1163.5 5 3.5 1239.7 6.8 Details
47 JNW Club - Maragon Open 2019 (E) Standard 2019-08-03 2019-08-03 Johannesburg Metro (GJM) 5 1200 4 1 965.8 -18.3 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 29
Wins 22
Draws 3
Losses 4
White 17
Black 12
White wins 14
Black wins 8
Score 23.5
Percent 81
Dp 263.8
AOR 1649.5
Performance 1913.3
Game statistics (History)
Games 268
Wins 177
Draws 19
Losses 72
White 138
Black 130
White wins 91
Black wins 86
Score 186.5
Percent 69.6
Dp 166.5
AOR 1493.7
Performance 1660.2
Rankings (Main)
National
Overall 179
Gender 172
Age group 14
Gender/Age 14
Provincial
Overall 8
Gender 8
Age group 1
Gender/Age 1
Regional
Overall 7
Gender 7
Age group 1
Gender/Age 1
Rankings (Standard)
National
Overall 185
Gender 178
Age group 14
Gender/Age 14
Provincial
Overall 8
Gender 8
Age group 1
Gender/Age 1
Regional
Overall 7
Gender 7
Age group 1
Gender/Age 1
Rankings (Rapid)
National
Overall 209
Gender 199
Age group 27
Gender/Age 27
Provincial
Overall 19
Gender 19
Age group 2
Gender/Age 2
Regional
Overall 17
Gender 17
Age group 2
Gender/Age 2
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 29
Score 23.5
Percent 81
Aor 1649.5
Dp 263.8
Prat 1913.3
Performance (12 months)
Games 33
Score 25.5
Percent 77.3
Aor 1652.5
Dp 231.8
Prat 1884.3
Performance (History)
Games 268
Score 186.5
Percent 69.6
Aor 1493.7
Dp 166.5
Prat 1660.2
Top 5 opponents most often played
Type # Opponent Games White Black First tournament Last tournament Details
Overall 1 Li, Z (Zhengfei) 7 4 3 Mzansi Spring Open 2022 (Advanced) 2025 KZN Open (A) Details
Overall 2 Jugree, A (Arav) 4 2 2 2025 Umhlanga Youth Open (High School) 2026 Mandela 67 Chess Tournament (Open) Details
Overall 3 Ngcongo, M (Minenhle) 4 2 2 South African Open 2025 (B) 2026 KwaZulu Natal Open (A) Details
Overall 4 Kruger, T (Tobias) 3 2 1 Africawide Chess Championship 2023 (Open) South African Open 2025 (B) Details
Overall 5 Naicker, GC (Gabriel Christian) 3 0 3 JMC Trials 1 - Laerskool Fontainebleau 2022 (U14) 2022 South African Junior Wild Card Chess Championships (U14 Open) Details
Standard 1 Li, Z (Zhengfei) 5 4 1 Mzansi Spring Open 2022 (Advanced) 2025 KZN Open (A) Details
Standard 2 Ngcongo, M (Minenhle) 4 2 2 South African Open 2025 (B) 2026 KwaZulu Natal Open (A) Details
Standard 3 Jugree, A (Arav) 3 2 1 2025 Umhlanga Youth Open (High School) 2026 Mandela 67 Chess Tournament (Open) Details
Standard 4 Naicker, GC (Gabriel Christian) 3 0 3 JMC Trials 1 - Laerskool Fontainebleau 2022 (U14) 2022 South African Junior Wild Card Chess Championships (U14 Open) Details
Standard 5 Kruger, T (Tobias) 3 2 1 Africawide Chess Championship 2023 (Open) South African Open 2025 (B) Details