PLAYER PAGE
Willem Duursema
1110316415Tshwane (GTP)Personal
Main rating
| Rating | 1376 |
| K-factor | 36 |
| Floor | 876 |
| Highest | 1376 (2026-07-01) |
| Min/Max +/- allowed | 129 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1341.2 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1376 |
| K-factor | 36 |
| Floor | 876 |
| Highest | 1376 (2026-07-01) |
| Min/Max +/- allowed | 129 |
Standard rating
| Rating | 1377.9 |
| K-factor | 36 |
| Floor | 878.1 |
| Highest | 1378.1 (2025-08-01) |
| Min/Max +/- allowed | 128.7 |
| Rating Change () | |
| Games | 0 |
| Score | 0 |
| We | 0 |
| SWe | 0 |
| Temp +/- | 0 |
| Penalties | 0 |
| Weight perform | 1341.2 |
| Final +/- | 0 |
| New Rating () | |
| Rating | 1377.9 |
| K-factor | 36 |
| Floor | 878.1 |
| Highest | 1378.1 (2025-08-01) |
| Min/Max +/- allowed | 128.7 |
Rapid rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2025-03-01) |
| 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 (2025-03-01) |
| Min/Max +/- allowed | 165.8 |
Blitz rating
| Rating | 1200 |
| K-factor | 36 |
| Floor | 700 |
| Highest | 1200 (2025-03-01) |
| 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 (2025-03-01) |
| 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 | 2026 Anton Van Wouw Open (C) | Standard | 2026-06-20 | 2026-06-20 | Tshwane (GTP) | 5 | 1340.1 | 5 | 2.5 | 1414.8 | 14.2 | Details |
| 2 | Elise Steenkamp 2026 (Rook) | Standard | 2026-06-13 | 2026-06-15 | Tshwane (GTP) | 7 | 1340.1 | 7 | 4 | 1413.2 | 21.7 | Details |
| 3 | 2026 D3 Tshwane North Individuals (U15 Boys) | Standard | 2026-05-09 | 2026-05-09 | Tshwane (GTP) | 5 | 1348.3 | 5 | 3 | 1293 | -8.2 | Details |
| 4 | 2026 KSNG Open Chess Tournament (C) | Standard | 2026-04-18 | 2026-04-18 | Tshwane (GTP) | 5 | 1348.7 | 5 | 1 | 1146.2 | -34.4 | Details |
| 5 | 2026 D3 Tshwane North School Cluster 4&5 Individuals (U15 Mixed) | Standard | 2026-04-11 | 2026-04-11 | Tshwane (GTP) | 5 | 1348.7 | 5 | 4 | 1548.8 | 34 | Details |
| 6 | 2026 Silver Lakes Open Chess Tournament (C) | Standard | 2026-03-07 | 2026-03-07 | Tshwane (GTP) | 5 | 1338.1 | 5 | 2.5 | 1392.1 | 10.6 | Details |
| 7 | 2026 Tshwane Chess Registration Tournament (C1) | Standard | 2026-01-31 | 2026-01-31 | Tshwane (GTP) | 5 | 1358.6 | 4 | 1 | 1213.8 | -11.3 | Details |
| 8 | 2025 Laerskool Doringkloof Primary Open Chess Tournament (C) | Standard | 2025-10-25 | 2025-10-25 | Tshwane (GTP) | 5 | 1367.1 | 5 | 2.5 | 1325.3 | -4.8 | Details |
| 9 | 2025 Tshwane North District CLOSED Team Championships (D3) (U15 Open) | Standard | 2025-08-16 | 2025-08-16 | Tshwane (GTP) | 5 | 1375.5 | 5 | 3 | 1318.9 | -4.6 | Details |
| 10 | 2025 Tshwane North School District Cluster 4 & 5 Team League (D3) (U15) | Standard | 2025-07-26 | 2025-07-26 | Tshwane (GTP) | 5 | 1351.4 | 4 | 3 | 1422.2 | 5.6 | Details |
| 11 | 2025 Jacaranda Round Robin Open Chess Tournament (K) | Standard | 2025-06-21 | 2025-06-21 | Tshwane (GTP) | 5 | 1295.8 | 5 | 4 | 1524.4 | 21.6 | Details |
| 12 | 2025 Elise Steenkamp Open Chess Tournament (Rook) | Standard | 2025-06-14 | 2025-06-16 | Tshwane (GTP) | 7 | 1295.8 | 7 | 3 | 1208.3 | -14.3 | Details |
| 13 | 2025 Tshwane North School District CLOSED Individual Chess Championship (U15 Open) | Standard | 2025-05-24 | 2025-05-24 | Tshwane (GTP) | 5 | 1223.6 | 4 | 2 | 1382.4 | 10.8 | Details |
| 14 | 2025 Tshwane North School District CLOSED Individual Championships Cluster 4&5 (U15 Open) | Standard | 2025-05-10 | 2025-05-10 | Tshwane (GTP) | 5 | 1223.6 | 5 | 3 | 1294 | 6.1 | Details |
| 15 | 2025 Silver Lakes Chess Club Open Chess Tournament (D) | Standard | 2025-05-03 | 2025-05-03 | Tshwane (GTP) | 5 | 1223.6 | 4 | 2 | 1256.5 | 2.5 | Details |
| 16 | 2025 Mid Gauteng Open Chess Tournament (D) | Standard | 2025-04-12 | 2025-04-12 | Tshwane (GTP) | 5 | 1199.8 | 5 | 3 | 1314.8 | 12 | Details |
| 17 | 2025 KSNG Open (D) | Standard | 2025-02-22 | 2025-02-22 | Tshwane (GTP) | 5 | 1200 | 5 | 2 | 1129.3 | -6.1 | 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 | 36 |
| Wins | 17 |
| Draws | 2 |
| Losses | 17 |
| White | 16 |
| Black | 20 |
| White wins | 10 |
| Black wins | 7 |
| Score | 18 |
| Percent | 50 |
| Dp | 0 |
| AOR | 1353.4 |
| Performance | 1353.4 |
Game statistics (History)
| Games | 85 |
| Wins | 43 |
| Draws | 5 |
| Losses | 37 |
| White | 41 |
| Black | 44 |
| White wins | 23 |
| Black wins | 20 |
| Score | 45.5 |
| Percent | 53.5 |
| Dp | 30 |
| AOR | 1298.9 |
| Performance | 1328.9 |
Rankings (Main)
| National | |
| Overall | 4173 |
| Gender | 3494 |
| Age group | 598 |
| Gender/Age | 475 |
| Provincial | |
| Overall | 1437 |
| Gender | 1201 |
| Age group | 210 |
| Gender/Age | 164 |
| Regional | |
| Overall | 508 |
| Gender | 418 |
| Age group | 74 |
| Gender/Age | 60 |
Rankings (Standard)
| National | |
| Overall | 3690 |
| Gender | 3064 |
| Age group | 546 |
| Gender/Age | 434 |
| Provincial | |
| Overall | 1322 |
| Gender | 1107 |
| Age group | 201 |
| Gender/Age | 158 |
| Regional | |
| Overall | 486 |
| Gender | 399 |
| Age group | 76 |
| Gender/Age | 61 |
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 | 36 |
| Score | 18 |
| Percent | 50 |
| Aor | 1353.4 |
| Dp | 0 |
| Prat | 1353.4 |
Performance (12 months)
| Games | 46 |
| Score | 23.5 |
| Percent | 51.1 |
| Aor | 1337.3 |
| Dp | 9.2 |
| Prat | 1346.6 |
Performance (History)
| Games | 85 |
| Score | 45.5 |
| Percent | 53.5 |
| Aor | 1298.9 |
| Dp | 30 |
| Prat | 1328.9 |
Top 5 opponents most often played
| Type | # | Opponent | Games | White | Black | First tournament | Last tournament | Details |
| Overall | 1 | Labuscagne, W (Waldo) | 2 | 1 | 1 | 2025 Elise Steenkamp Open Chess Tournament (Rook) | 2026 Anton Van Wouw Open (C) | Details |
| Overall | 2 | Jonker, T (Tertius) | 2 | 2 | 0 | 2026 KSNG Open Chess Tournament (C) | 2026 Anton Van Wouw Open (C) | Details |
| Overall | 3 | Rautenbach, R (Randolph) | 2 | 2 | 0 | 2025 Laerskool Doringkloof Primary Open Chess Tournament (C) | Elise Steenkamp 2026 (Rook) | Details |
| Overall | 4 | Nolan, C (Christopher) | 2 | 1 | 1 | 2026 KSNG Open Chess Tournament (C) | Elise Steenkamp 2026 (Rook) | Details |
| Overall | 5 | Potgieter, W (Wilmari) | 2 | 0 | 2 | 2025 Tshwane North School District Cluster 4 & 5 Team League (D3) (U15) | 2025 Tshwane North District CLOSED Team Championships (D3) (U15 Open) | Details |
| Standard | 1 | Jonker, T (Tertius) | 2 | 2 | 0 | 2026 KSNG Open Chess Tournament (C) | 2026 Anton Van Wouw Open (C) | Details |
| Standard | 2 | Potgieter, W (Wilmari) | 2 | 0 | 2 | 2025 Tshwane North School District Cluster 4 & 5 Team League (D3) (U15) | 2025 Tshwane North District CLOSED Team Championships (D3) (U15 Open) | Details |
| Standard | 3 | Labuscagne, W (Waldo) | 2 | 1 | 1 | 2025 Elise Steenkamp Open Chess Tournament (Rook) | 2026 Anton Van Wouw Open (C) | Details |
| Standard | 4 | Vorster, W (Wian) | 2 | 0 | 2 | 2026 KSNG Open Chess Tournament (C) | Elise Steenkamp 2026 (Rook) | Details |
| Standard | 5 | Ngwana, T (Thapelo Jurie Junior) | 2 | 2 | 0 | 2025 Tshwane North School District CLOSED Individual Championships Cluster 4&5 (U15 Open) | 2025 Tshwane North School District CLOSED Individual Chess Championship (U15 Open) | Details |