| Game Balance of Robbert van Opstal, sorted by Ratings of Opponents | ||||||||
|---|---|---|---|---|---|---|---|---|
| Event | Opponent | Result | ||||||
| Place | Date | Significance | Surname | Prename | Rating ↑ | Expected | Observed | Net Yield | 
| Groningen | 1999-04-10 | 0.000000 | Eefting | Roel | 1568 | 0.31386 | 1.00000 | 0.68614 | 
| Groningen | 1999-04-10 | 0.000000 | Helmus | René | 1551 | 0.33612 | 0.00000 | -0.33612 | 
| Groningen | 1999-04-10 | 0.000000 | Derks | Marc | 1526 | 0.36969 | 0.00000 | -0.36969 | 
| Leudsen | 1998-10-01 | 0.000000 | Rinzema | Sander | 1513 | 0.38778 | 0.50000 | 0.11222 | 
| Leudsen | 1998-10-01 | 0.000000 | Geertsma | Hans | 1329 | 0.64735 | 0.00000 | -0.64735 | 
| Leudsen | 1998-10-01 | 0.000000 | Verleysdonk | Wim | 1199 | 0.80113 | 1.00000 | 0.19887 | 
| Groningen | 1999-04-10 | 0.000000 | Lommert | Peter | 1001 | 0.93819 | 1.00000 | 0.06181 | 
| Leudsen | 1998-10-01 | 0.000000 | Paffen | Ard | 951 | 0.95586 | 0.00000 | -0.95586 | 
| Leudsen | 1998-10-01 | 0.000000 | Haar | Eric van de | 917 | 0.96525 | 0.00000 | -0.96525 | 
| Leudsen | 1998-10-01 | 0.000000 | Leijten | Ben | 863 | 0.97640 | 0.50000 | -0.47640 | 
| Groningen | 1999-04-10 | 0.000000 | Keizer | Robin | 752 | 0.98957 | 1.00000 | 0.01043 | 
| Leudsen | 1998-10-01 | 0.000000 | Smit | Joost de | 569 | 0.99740 | 1.00000 | 0.00260 | 
| Groningen | 1999-04-10 | 0.000000 | Beijsens | Robert | 415 | 0.99920 | 1.00000 | 0.00080 | 
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