| 1.f25 | - | c64 |
| 2.fe4 |
Although e5 looks very explosive in the outcome, the phalanxes on the e-line and the 5-line are save for the moment. Both players have room to manoeuvre, and nothing indicates that black should be in trouble.
| 1.f25 |
| 1. ...c64 | 1. ...eg8 | ...e96 | ...f87 | ...c54 | ...c74 | ...bc4 |
| 2.ed3 | 2.fe4 | 2.ge5 |
| Regular defence |
| 7.f45 | 7.hg6 |
| Treep defence |
| 5.g56 | 5.e13 | 5.fe4 | 5.ge4 |
| A dubious alternative |
| One way out | Another way out |