White to move
| Date: | 1980 |
| White: | Ristoja |
| Black: | Debarnot |
| Combination strength: | 7 |
| Game section | Middle game |
| Decisive material advantage | Problems in cooperation |
| Mate combination | - |
| Date: | 1980 |
| White: | Ristoja |
| Black: | Debarnot |
| Combination strength: | 7 |
| Game section | Middle game |
| Decisive material advantage | Problems in cooperation |
| Mate combination | - |