| Game Balance of Robbert van Opstal, sorted by Ratings of Opponents | ||||||||
|---|---|---|---|---|---|---|---|---|
| Event | Opponent | Result | ||||||
| Place | Date | Significance | Surname | Prename | Rating ↑ | Expected | Observed | Net Yield |
| Leudsen | 1998-10-01 | 0.000000 | Leijten | Ben | 2348 | 0.00105 | 0.50000 | 0.49895 |
| Groningen | 1999-04-10 | 0.000000 | Helmus | René | 1552 | 0.25029 | 0.00000 | -0.25029 |
| Leudsen | 1998-10-01 | 0.000000 | Rinzema | Sander | 1503 | 0.30855 | 0.50000 | 0.19145 |
| Groningen | 1999-04-10 | 0.000000 | Derks | Marc | 1476 | 0.34360 | 0.00000 | -0.34360 |
| Groningen | 1999-04-10 | 0.000000 | Eefting | Roel | 1399 | 0.45133 | 1.00000 | 0.54867 |
| Leudsen | 1998-10-01 | 0.000000 | Geertsma | Hans | 1256 | 0.65263 | 0.00000 | -0.65263 |
| Leudsen | 1998-10-01 | 0.000000 | Verleysdonk | Wim | 1188 | 0.73804 | 1.00000 | 0.26196 |
| Groningen | 1999-04-10 | 0.000000 | Lommert | Peter | 988 | 0.91122 | 1.00000 | 0.08878 |
| Leudsen | 1998-10-01 | 0.000000 | Paffen | Ard | 988 | 0.91133 | 0.00000 | -0.91133 |
| Leudsen | 1998-10-01 | 0.000000 | Haar | Eric van de | 899 | 0.95037 | 0.00000 | -0.95037 |
| Groningen | 1999-04-10 | 0.000000 | Keizer | Robin | 754 | 0.98239 | 1.00000 | 0.01761 |
| Leudsen | 1998-10-01 | 0.000000 | Smit | Joost de | 553 | 0.99609 | 1.00000 | 0.00391 |
| Groningen | 1999-04-10 | 0.000000 | Beijsens | Robert | 407 | 0.99872 | 1.00000 | 0.00128 |
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