PLAYER PAGE
John Mostert
1200328612Tshwane (GTP)Personal
Main rating
| Rating | 907.1 |
| K-factor | 40 |
| Floor | 699 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166 |
| Rating Change () | |
| Games | 4 |
| Score | 0 |
| We | 0.54 |
| SWe | -0.44 |
| Temp +/- | -17.8 |
| Penalties | 0 |
| Weight perform | 739.2 |
| Final +/- | -17.8 |
| New Rating () | |
| Rating | 889.4 |
| K-factor | 40 |
| Floor | 699 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
Standard rating
| Rating | 887.7 |
| K-factor | 40 |
| Floor | 699 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
| Rating Change () | |
| Games | 4 |
| Score | 0 |
| We | 0.47 |
| SWe | -0.47 |
| Temp +/- | -19 |
| Penalties | 0 |
| Weight perform | 739.2 |
| Final +/- | -19 |
| New Rating () | |
| Rating | 868.8 |
| K-factor | 40 |
| Floor | 699 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
Rapid rating
| Rating | 1200 |
| K-factor | 40 |
| Floor | 700 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
| 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 | 40 |
| Floor | 700 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
Blitz rating
| Rating | 1200 |
| K-factor | 40 |
| Floor | 700 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
| 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 | 40 |
| Floor | 700 |
| Highest | 1199 (2025-09-30) |
| Min/Max +/- allowed | 166.1 |
Rating Graph
Tournaments
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | Gauteng Closed Chess Championships 2026 (U8 Open) | Standard | 2026-10-17 | 2026-10-17 | Ekurhuleni (GE) | 5 | 907.1 | 4 | 0 | 813.1 | -17.8 | Details |
| # | Tournament | Type | Start | End | Host | Rounds | Rating | Games | Score | Perform | Rat+/- | Details |
| 1 | 2026 Alekhine Open Chess Tournament (E) | Standard | 2026-08-29 | 2026-08-29 | Tshwane (GTP) | 5 | 907.1 | 4 | 0 | 620.1 | -69.9 | Details |
| 2 | 2026 Etienne Lewis (U8) | Standard | 2026-08-08 | 2026-08-08 | Tshwane (GTP) | 5 | 907.1 | 5 | 1 | 835.5 | -38.3 | Details |
| 3 | Elise Steenkamp 2026 (Pawn) | Standard | 2026-06-13 | 2026-06-13 | Tshwane (GTP) | 5 | 1079.9 | 4 | 0 | 696.8 | -64.6 | Details |
| 4 | 2026 KSNG Open Chess Tournament (U8+U10) | Standard | 2026-04-18 | 2026-04-18 | Tshwane (GTP) | 5 | 1122.7 | 4 | 0 | 850.7 | -42.7 | Details |
| 5 | 2026 Lubowski Open Chess Tournament (E+F) | Standard | 2026-03-21 | 2026-03-21 | Tshwane (GTP) | 5 | 1168.4 | 5 | 1.5 | 1033.8 | -31.4 | Details |
| 6 | 2026 Silver Lakes Open Chess Tournament (U8) | Standard | 2026-03-07 | 2026-03-07 | Tshwane (GTP) | 4 | 1168.4 | 3 | 1 | 1058.3 | -14.3 | Details |
| 7 | 2026 Tshwane Chess Registration Tournament (U8) | Standard | 2026-01-31 | 2026-01-31 | Tshwane (GTP) | 5 | 1175.6 | 5 | 1 | 971.8 | -19.3 | Details |
| 8 | 2025 Centurion Chess Open Tournament (U8) | Standard | 2025-09-27 | 2025-09-27 | Tshwane (GTP) | 5 | 1200 | 5 | 0 | 853.2 | -33.2 | Details |
Game statistics ( )
| Games | 4 |
| Wins | 0 |
| Draws | 0 |
| Losses | 4 |
| White | 2 |
| Black | 2 |
| White wins | 0 |
| Black wins | 0 |
| Score | 0 |
| Percent | 0 |
| Dp | -425 |
| AOR | 1238.1 |
| Performance | 813.1 |
Game statistics ()
| Games | 34 |
| Wins | 4 |
| Draws | 1 |
| Losses | 29 |
| White | 16 |
| Black | 18 |
| White wins | 4 |
| Black wins | 0 |
| Score | 4.5 |
| Percent | 13.2 |
| Dp | -312.5 |
| AOR | 1174.4 |
| Performance | 861.9 |
Game statistics (History)
| Games | 39 |
| Wins | 4 |
| Draws | 1 |
| Losses | 34 |
| White | 18 |
| Black | 21 |
| White wins | 4 |
| Black wins | 0 |
| Score | 4.5 |
| Percent | 11.5 |
| Dp | -326.9 |
| AOR | 1187.7 |
| Performance | 860.8 |
Rankings (Main)
| National | |
| Overall | 18803 |
| Gender | 13769 |
| Age group | 281 |
| Gender/Age | 190 |
| Provincial | |
| Overall | 6193 |
| Gender | 4462 |
| Age group | 66 |
| Gender/Age | 42 |
| Regional | |
| Overall | 1779 |
| Gender | 1292 |
| Age group | 18 |
| Gender/Age | 11 |
Rankings (Standard)
| National | |
| Overall | 14045 |
| Gender | 10172 |
| Age group | 217 |
| Gender/Age | 142 |
| Provincial | |
| Overall | 4775 |
| Gender | 3412 |
| Age group | 53 |
| Gender/Age | 35 |
| Regional | |
| Overall | 1671 |
| Gender | 1198 |
| Age group | 18 |
| Gender/Age | 11 |
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 | 4 |
| Score | 0 |
| Percent | 0 |
| Aor | 1238.1 |
| Dp | -425 |
| Prat | 813.1 |
Performance ()
| Games | 34 |
| Score | 4.5 |
| Percent | 13.2 |
| Aor | 1174.4 |
| Dp | -312.5 |
| Prat | 861.9 |
Performance (12 months)
| Games | 34 |
| Score | 4.5 |
| Percent | 13.2 |
| Aor | 1174.4 |
| Dp | -312.5 |
| Prat | 861.9 |
Performance (History)
| Games | 39 |
| Score | 4.5 |
| Percent | 11.5 |
| Aor | 1187.7 |
| Dp | -326.9 |
| Prat | 860.8 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Jansen Van Vuuren, J (Jaelyn) | 5 | 3 | 2 | 2026 Silver Lakes Open Chess Tournament (U8) | 2026 Alekhine Open Chess Tournament (E) | Details |
| Overall | 2 | Sekgobela, A (Adil) | 3 | 2 | 1 | 2026 Tshwane Chess Registration Tournament (U8) | 2026 Alekhine Open Chess Tournament (E) | Details |
| Overall | 3 | Rampersadh, A (Ayaan) | 2 | 0 | 2 | 2026 Tshwane Chess Registration Tournament (U8) | Elise Steenkamp 2026 (Pawn) | Details |
| Overall | 4 | Maswabela, L (Lethabo) | 2 | 1 | 1 | 2026 Lubowski Open Chess Tournament (E+F) | Elise Steenkamp 2026 (Pawn) | Details |
| Overall | 5 | Grobbelaar, N (Nina) | 2 | 0 | 2 | 2025 Centurion Chess Open Tournament (U8) | 2026 Etienne Lewis (U8) | Details |
| Standard | 1 | Jansen Van Vuuren, J (Jaelyn) | 5 | 3 | 2 | 2026 Silver Lakes Open Chess Tournament (U8) | 2026 Alekhine Open Chess Tournament (E) | Details |
| Standard | 2 | Sekgobela, A (Adil) | 3 | 2 | 1 | 2026 Tshwane Chess Registration Tournament (U8) | 2026 Alekhine Open Chess Tournament (E) | Details |
| Standard | 3 | Viljoen, W (Wesley) | 2 | 1 | 1 | 2026 Silver Lakes Open Chess Tournament (U8) | 2026 Etienne Lewis (U8) | Details |
| Standard | 4 | Grobbelaar, N (Nina) | 2 | 0 | 2 | 2025 Centurion Chess Open Tournament (U8) | 2026 Etienne Lewis (U8) | Details |
| Standard | 5 | Rampersadh, A (Ayaan) | 2 | 0 | 2 | 2026 Tshwane Chess Registration Tournament (U8) | Elise Steenkamp 2026 (Pawn) | Details |