PLAYER PAGE
Abishai Korah Jacob
1090136702West Rand (GWR)Personal
Main rating
| Rating | 1249.9 |
| K-factor | 36 |
| Floor | 787.7 |
| Highest | 1302.4 (2023-05-01) |
| Min/Max +/- allowed | 143 |
| Rating Change () | |
| Games | 9 |
| Score | 4.5 |
| We | 2.57 |
| SWe | 0.62 |
| Temp +/- | 22.2 |
| Penalties | 0 |
| Weight perform | 1273.3 |
| Final +/- | +23.4 |
| New Rating () | |
| Rating | 1273.3 |
| K-factor | 36 |
| Floor | 787.7 |
| Highest | 1302.4 (2023-05-01) |
| Min/Max +/- allowed | 143.3 |
Standard rating
| Rating | 1245.7 |
| K-factor | 36 |
| Floor | 807.4 |
| Highest | 1307.4 (2026-06-01) |
| Min/Max +/- allowed | 142.3 |
| Rating Change () | |
| Games | 5 |
| Score | 1.5 |
| We | 0.98 |
| SWe | 0.52 |
| Temp +/- | 18.8 |
| Penalties | 0 |
| Weight perform | 1211.1 |
| Final +/- | +18.8 |
| New Rating () | |
| Rating | 1264.5 |
| K-factor | 36 |
| Floor | 807.4 |
| Highest | 1307.4 (2026-06-01) |
| Min/Max +/- allowed | 142.3 |
Rapid rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
| Rating Change () | |
| Games | 4 |
| Score | 3 |
| We | 2.16 |
| SWe | -0.41 |
| Temp +/- | -14.6 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | -14.6 |
| New Rating () | |
| Rating | 1185.4 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2018-10-01) |
| Min/Max +/- allowed | 165.8 |
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
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | Gauteng Closed Chess Championships 2026 (U18 Open) | Standard | 2026-10-17 | 2026-10-17 | Ekurhuleni (GE) | 5 | 1249.9 | 5 | 1.5 | 1362.8 | 18.1 | Details |
| 2 | Gauteng Top Schools Teams 2026 (U19 Open) | Rapid | 2026-08-28 | 2026-08-28 | Ekurhuleni (GE) | 5 | 1249.9 | 4 | 3 | 1531.5 | 9.4 | Details |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | 2026 D2 Schools League Finals (U19) | Standard | 2026-08-15 | 2026-08-15 | West Rand (GWR) | 5 | 1249.9 | 4 | 2 | 1020.8 | -29.8 | Details |
| 2 | 2026 D2 Top 20 Schools Individuals (U17) | Standard | 2026-07-25 | 2026-07-25 | West Rand (GWR) | 5 | 1299.4 | 5 | 1 | 1182 | -19.6 | Details |
| 3 | 2026 D2 Schools Individuals (U18 Boys) | Standard | 2026-05-15 | 2026-05-16 | West Rand (GWR) | 5 | 1287.7 | 5 | 2.5 | 1347.3 | 11.6 | Details |
| 4 | West Rand Open 2026 (Rooks) | Standard | 2026-02-07 | 2026-02-07 | West Rand (GWR) | 5 | 1254 | 5 | 3 | 1455.2 | 12.5 | Details |
| 5 | JCC Steyn City High Schools League 2025 (A) | Standard | 2025-05-07 | 2025-06-09 | Johannesburg Metro (GJM) | 6 | 1265.7 | 3 | 1 | 1166.8 | -6.5 | Details |
| 6 | 2025 D2 Schools Individuals (U18 Open) | Standard | 2025-05-10 | 2025-05-10 | West Rand (GWR) | 5 | 1233.4 | 5 | 3 | 1411.2 | 17.9 | Details |
| 7 | Gauteng Inter-Region at UJ 2024 (U16 Candidates) | Standard | 2024-12-07 | 2024-12-08 | Johannesburg Metro (GJM) | 5 | 1253.3 | 5 | 1 | 1085.6 | -19.5 | Details |
| 8 | 2024 West Rand Closed (U16) | Standard | 2024-10-12 | 2024-10-12 | West Rand (GWR) | 5 | 1262.9 | 5 | 2 | 1216.4 | -5.3 | Details |
| 9 | 2024 West Rand Trials (U16) | Standard | 2024-09-07 | 2024-09-07 | West Rand (GWR) | 5 | 1248 | 5 | 2.5 | 1325.3 | 8.3 | Details |
| 10 | D2 School League Finals 2024 (U19) | Standard | 2024-07-20 | 2024-07-20 | West Rand (GWR) | 5 | 1255.2 | 5 | 2 | 1207.3 | -4 | Details |
| 11 | 2024 D2 Schools Individuals (U15 Boys) | Standard | 2024-05-04 | 2024-05-04 | West Rand (GWR) | 5 | 1236.1 | 5 | 3 | 1337 | 10.6 | Details |
| 12 | 2024 West Rand RHS Open (Rooks) | Standard | 2024-04-13 | 2024-04-13 | West Rand (GWR) | 5 | 1222.7 | 5 | 2 | 1204.6 | -1.2 | Details |
| 13 | Dainfern College Chess League 2024 (A) | Standard | 2024-01-29 | 2024-03-11 | Johannesburg Metro (GJM) | 6 | 1222.7 | 6 | 3 | 1297.4 | 8.6 | Details |
| 14 | 1st Knights Open Tournament 2024 (C) | Standard | 2024-03-23 | 2024-03-23 | Johannesburg Metro (GJM) | 5 | 1188.3 | 5 | 2 | 1230 | 4.6 | Details |
| 15 | 2024 West Rand Juniors (U16) | Standard | 2024-03-09 | 2024-03-09 | West Rand (GWR) | 5 | 1188.3 | 5 | 3 | 1329.6 | 14.4 | Details |
| 16 | 2024 West Rand Open (Rooks) | Standard | 2024-02-03 | 2024-02-03 | West Rand (GWR) | 5 | 1192.2 | 5 | 2 | 1162.1 | -2.3 | Details |
| 17 | St Peters College Chess League 2023 (A) | Standard | 2023-09-11 | 2023-10-23 | Johannesburg Metro (GJM) | 6 | 1224.8 | 4 | 1 | 992.9 | -18.1 | Details |
| 18 | 2023 West Rand Trials (U16) | Standard | 2023-09-09 | 2023-09-09 | West Rand (GWR) | 5 | 1254.4 | 4 | 1 | 1041.9 | -16.6 | Details |
| 19 | D2 Schools Individuals 2023 (U15 Boys) | Standard | 2023-05-13 | 2023-05-13 | West Rand (GWR) | 5 | 1096.2 | 4 | 2 | 1232.2 | 10.5 | Details |
| 20 | Steyn City School Chess League 2023 (A) | Standard | 2023-05-05 | 2023-05-29 | Johannesburg Metro (GJM) | 6 | 1096.2 | 2 | 1 | 1152 | 0.8 | Details |
| 21 | Steyn City School Chess League 2023 (B) | Standard | 2023-05-05 | 2023-05-29 | Johannesburg Metro (GJM) | 6 | 1096.2 | 3 | 3 | 1624.2 | 30.2 | Details |
| 22 | West Rand Juniors 2023 (U16) | Standard | 2023-03-18 | 2023-03-18 | West Rand (GWR) | 5 | 1082.9 | 5 | 2 | 1143.6 | 6.5 | Details |
| 23 | West Rand Trials 2022 (U14) | Standard | 2022-09-03 | 2022-09-03 | West Rand (GWR) | 5 | 1138.3 | 4 | 0 | 784.5 | -27.7 | Details |
| 24 | 2nd West Rand Open 2022 (Juniors) | Standard | 2022-08-06 | 2022-08-06 | West Rand (GWR) | 5 | 1131.7 | 5 | 2 | 1159.3 | 3.3 | Details |
| 25 | D2 Schools Individuals 2022 (U13 Boys) | Standard | 2022-05-07 | 2022-05-07 | West Rand (GWR) | 5 | 1140.3 | 5 | 2 | 1103.4 | -4.3 | Details |
| 26 | West Rand Juniors 2022 (U14) | Standard | 2022-04-09 | 2022-04-09 | West Rand (GWR) | 5 | 1146.9 | 5 | 2 | 1120 | -3.3 | Details |
| 27 | West Rand Open 2022 (U14) | Standard | 2022-02-05 | 2022-02-05 | West Rand (GWR) | 5 | 1200 | 5 | 1 | 936 | -26.4 | Details |
Game statistics ( )
| Games | 5 |
| Wins | 1 |
| Draws | 1 |
| Losses | 3 |
| White | 3 |
| Black | 2 |
| White wins | 0 |
| Black wins | 1 |
| Score | 1.5 |
| Percent | 30 |
| Dp | -170 |
| AOR | 1532.8 |
| Performance | 1362.8 |
Game statistics ()
| Games | 28 |
| Wins | 12 |
| Draws | 2 |
| Losses | 14 |
| White | 14 |
| Black | 14 |
| White wins | 5 |
| Black wins | 7 |
| Score | 13 |
| Percent | 46.4 |
| Dp | -30.4 |
| AOR | 1349.8 |
| Performance | 1319.5 |
Game statistics (History)
| Games | 133 |
| Wins | 55 |
| Draws | 3 |
| Losses | 75 |
| White | 66 |
| Black | 67 |
| White wins | 26 |
| Black wins | 29 |
| Score | 56.5 |
| Percent | 42.5 |
| Dp | -63.9 |
| AOR | 1278 |
| Performance | 1214.1 |
Rankings (Main)
| National | |
| Overall | 8497 |
| Gender | 6832 |
| Age group | 1291 |
| Gender/Age | 1027 |
| Provincial | |
| Overall | 2943 |
| Gender | 2344 |
| Age group | 491 |
| Gender/Age | 384 |
| Regional | |
| Overall | 254 |
| Gender | 198 |
| Age group | 36 |
| Gender/Age | 27 |
Rankings (Standard)
| National | |
| Overall | 7415 |
| Gender | 5851 |
| Age group | 1160 |
| Gender/Age | 907 |
| Provincial | |
| Overall | 2674 |
| Gender | 2091 |
| Age group | 460 |
| Gender/Age | 352 |
| Regional | |
| Overall | 265 |
| Gender | 208 |
| Age group | 38 |
| Gender/Age | 28 |
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 | 5 |
| Score | 1.5 |
| Percent | 30 |
| Aor | 1532.8 |
| Dp | -170 |
| Prat | 1362.8 |
Performance ()
| Games | 28 |
| Score | 13 |
| Percent | 46.4 |
| Aor | 1349.8 |
| Dp | -30.4 |
| Prat | 1319.5 |
Performance (12 months)
| Games | 28 |
| Score | 13 |
| Percent | 46.4 |
| Aor | 1349.8 |
| Dp | -30.4 |
| Prat | 1319.5 |
Performance (History)
| Games | 133 |
| Score | 56.5 |
| Percent | 42.5 |
| Aor | 1278 |
| Dp | -63.9 |
| Prat | 1214.1 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Udodi, E (Edubechukwu) | 4 | 2 | 2 | 2024 West Rand Trials (U16) | 2026 D2 Top 20 Schools Individuals (U17) | Details |
| Overall | 2 | Badenhorst, JJ (Junaid Jaydon) | 3 | 1 | 2 | 2024 West Rand RHS Open (Rooks) | 2026 D2 Schools Individuals (U18 Boys) | Details |
| Overall | 3 | Sardinha, K (Keanu) | 2 | 1 | 1 | West Rand Open 2022 (U14) | West Rand Juniors 2022 (U14) | Details |
| Overall | 4 | Klaas, O (Oyintanda) | 2 | 1 | 1 | West Rand Juniors 2023 (U16) | 2023 West Rand Trials (U16) | Details |
| Overall | 5 | Myburgh, J (Joshua) | 2 | 2 | 0 | Steyn City School Chess League 2023 (B) | St Peters College Chess League 2023 (A) | Details |
| Standard | 1 | Udodi, E (Edubechukwu) | 4 | 2 | 2 | 2024 West Rand Trials (U16) | 2026 D2 Top 20 Schools Individuals (U17) | Details |
| Standard | 2 | Badenhorst, JJ (Junaid Jaydon) | 3 | 1 | 2 | 2024 West Rand RHS Open (Rooks) | 2026 D2 Schools Individuals (U18 Boys) | Details |
| Standard | 3 | Sibanda, M (Marlvin) | 2 | 1 | 1 | West Rand Trials 2022 (U14) | 2024 West Rand Closed (U16) | Details |
| Standard | 4 | Perry-Fisher, IE (Iain Eric) | 2 | 1 | 1 | 2024 West Rand Juniors (U16) | 2026 D2 Top 20 Schools Individuals (U17) | Details |
| Standard | 5 | Mbasane, D (David) | 2 | 2 | 0 | West Rand Juniors 2023 (U16) | 2023 West Rand Trials (U16) | Details |