PLAYER PAGE
Zack Stock
1120146892Cape Town (WCT)Personal
Main rating
| Rating | 1261.2 |
| K-factor | 36 |
| Floor | 791.4 |
| Highest | 1356.9 (2023-09-01) |
| Min/Max +/- allowed | 133 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1159.3 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1261.2 |
| K-factor | 36 |
| Floor | 791.4 |
| Highest | 1356.9 (2023-09-01) |
| Min/Max +/- allowed | 132.6 |
Standard rating
| Rating | 1202.7 |
| K-factor | 36 |
| Floor | 748.2 |
| Highest | 1248.2 (2024-03-01) |
| Min/Max +/- allowed | 154.8 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1094.4 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1202.7 |
| K-factor | 36 |
| Floor | 748.2 |
| Highest | 1248.2 (2024-03-01) |
| Min/Max +/- allowed | 154.8 |
Rapid rating
| Rating | 1328.7 |
| K-factor | 36 |
| Floor | 834 |
| Highest | 1640.6 (2023-07-01) |
| Min/Max +/- allowed | 88.5 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 0 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1328.7 |
| K-factor | 36 |
| Floor | 834 |
| Highest | 1640.6 (2023-07-01) |
| Min/Max +/- allowed | 88.5 |
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 |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | CT Metro South Individual Trials 2026 (U15 Boys) | Standard | 2026-02-07 | 2026-02-08 | Cape Town (WCT) | 6 | 1259 | 6 | 3 | 1270.7 | 0 | Details |
| 2 | UCT Open Chess Championship 2025 (U14) | Rapid | 2025-10-11 | 2025-10-11 | Cape Town (WCT) | 6 | 1243.5 | 6 | 3 | 1357.9 | 0 | Details |
| 3 | Cape Town Chess Junior League 2025 (U14) | Standard | 2025-05-10 | 2025-05-31 | Cape Town (WCT) | 6 | 1244.7 | 5 | 1 | 1034.2 | 0 | Details |
| 4 | District South Schools Chess Individual Trials 2025 (U13 Open) | Standard | 2025-02-01 | 2025-02-02 | Cape Town (WCT) | 6 | 1239.9 | 6 | 3 | 1231.1 | 0 | Details |
| 5 | Helderberg Chess Club PS Development Tournament 2025 (U13 Boys) | Standard | 2025-01-25 | 2025-01-25 | Cape Town (WCT) | 5 | 1194.5 | 5 | 2 | 1200.1 | 0 | Details |
| 6 | UCT Open Chess Championship 2024 (Intermediate) | Standard | 2024-10-12 | 2024-10-13 | Cape Town (WCT) | 6 | 1249.6 | 6 | 1 | 1000.5 | 0 | Details |
| 7 | Western Cape Top Schools Championship 2024 (U13 Mixed) | Standard | 2024-08-30 | 2024-09-01 | Eden (WEG) | 6 | 1291.4 | 4 | 0 | 978 | 0 | Details |
| 8 | Metro South Top Schools 2024 (U13) | Rapid | 2024-07-27 | 2024-07-28 | Cape Town (WCT) | 5 | 1254.5 | 5 | 4.5 | 1538 | 0 | Details |
| 9 | Cape Town Metro Schools Chess Closed Individuals 2024 (U13 Boys) | Standard | 2024-03-02 | 2024-03-03 | Cape Town (WCT) | 6 | 1281.7 | 6 | 2 | 1151.3 | 0 | Details |
| 10 | District South Schools Chess Individual Trials 2024 (U13 Boys) | Standard | 2024-02-03 | 2024-02-03 | Cape Town (WCT) | 5 | 1266.2 | 5 | 3 | 1345.6 | 0 | Details |
| 11 | Western Cape Top Schools 2023 (U11 Mixed) | Standard | 2023-09-02 | 2023-09-03 | Cape Winelands (WCW) | 6 | 1215.1 | 6 | 4 | 1457.6 | 0 | Details |
| 12 | CT Metro District South Top Schools 2023 (U9+U11 Mixed + U13 Girls) | Rapid | 2023-07-29 | 2023-07-29 | Cape Town (WCT) | 5 | 1165.2 | 4 | 4 | 1625 | 0 | Details |
| 13 | 2022 Western Province Club League (Junior) | Standard | 2022-08-27 | 2022-09-17 | Cape Town (WCT) | 7 | 1200 | 2 | 0 | 810.9 | 0 | 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 | 6 |
| Wins | 2 |
| Draws | 2 |
| Losses | 2 |
| White | 3 |
| Black | 3 |
| White wins | 2 |
| Black wins | 0 |
| Score | 3 |
| Percent | 50 |
| Dp | 0 |
| AOR | 1270.7 |
| Performance | 1270.7 |
Game statistics (History)
| Games | 66 |
| Wins | 29 |
| Draws | 3 |
| Losses | 34 |
| White | 33 |
| Black | 33 |
| White wins | 17 |
| Black wins | 12 |
| Score | 30.5 |
| Percent | 46.2 |
| Dp | -32.2 |
| AOR | 1281.3 |
| Performance | 1249.1 |
Rankings (Main)
| National | |
| Overall | 7740 |
| Gender | 6316 |
| Age group | 1385 |
| Gender/Age | 1070 |
| Provincial | |
| Overall | 2258 |
| Gender | 1757 |
| Age group | 392 |
| Gender/Age | 289 |
| Regional | |
| Overall | 1003 |
| Gender | 834 |
| Age group | 146 |
| Gender/Age | 115 |
Rankings (Standard)
| National | |
| Overall | 9785 |
| Gender | 7645 |
| Age group | 1810 |
| Gender/Age | 1354 |
| Provincial | |
| Overall | 2761 |
| Gender | 2056 |
| Age group | 496 |
| Gender/Age | 361 |
| Regional | |
| Overall | 1169 |
| Gender | 927 |
| Age group | 181 |
| Gender/Age | 134 |
Rankings (Rapid)
| National | |
| Overall | 1510 |
| Gender | 1268 |
| Age group | 310 |
| Gender/Age | 237 |
| Provincial | |
| Overall | 703 |
| Gender | 578 |
| Age group | 140 |
| Gender/Age | 104 |
| Regional | |
| Overall | 327 |
| Gender | 290 |
| Age group | 58 |
| Gender/Age | 49 |
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 | 6 |
| Score | 3 |
| Percent | 50 |
| Aor | 1270.7 |
| Dp | 0 |
| Prat | 1270.7 |
Performance (12 months)
| Games | 17 |
| Score | 7 |
| Percent | 41.2 |
| Aor | 1306.9 |
| Dp | -75 |
| Prat | 1231.9 |
Performance (History)
| Games | 66 |
| Score | 30.5 |
| Percent | 46.2 |
| Aor | 1281.3 |
| Dp | -32.2 |
| Prat | 1249.1 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Morrison, L (Liam) | 2 | 1 | 1 | District South Schools Chess Individual Trials 2024 (U13 Boys) | Cape Town Metro Schools Chess Closed Individuals 2024 (U13 Boys) | Details |
| Overall | 2 | Van Zyl, F (Frede) | 2 | 0 | 2 | Helderberg Chess Club PS Development Tournament 2025 (U13 Boys) | Cape Town Chess Junior League 2025 (U14) | Details |
| Overall | 3 | Shasha, I (Iyanda) | 2 | 1 | 1 | District South Schools Chess Individual Trials 2024 (U13 Boys) | District South Schools Chess Individual Trials 2025 (U13 Open) | Details |
| Overall | 4 | Bessesen, J (Joakim) | 2 | 0 | 2 | District South Schools Chess Individual Trials 2024 (U13 Boys) | CT Metro South Individual Trials 2026 (U15 Boys) | Details |
| Standard | 1 | Morrison, L (Liam) | 2 | 1 | 1 | District South Schools Chess Individual Trials 2024 (U13 Boys) | Cape Town Metro Schools Chess Closed Individuals 2024 (U13 Boys) | Details |
| Standard | 2 | Van Zyl, F (Frede) | 2 | 0 | 2 | Helderberg Chess Club PS Development Tournament 2025 (U13 Boys) | Cape Town Chess Junior League 2025 (U14) | Details |
| Standard | 3 | Shasha, I (Iyanda) | 2 | 1 | 1 | District South Schools Chess Individual Trials 2024 (U13 Boys) | District South Schools Chess Individual Trials 2025 (U13 Open) | Details |
| Standard | 4 | Bessesen, J (Joakim) | 2 | 0 | 2 | District South Schools Chess Individual Trials 2024 (U13 Boys) | CT Metro South Individual Trials 2026 (U15 Boys) | Details |