| 1.f25 | - | bc4? |
| 2.ed3 |
There a resemblance with 1. ... c74 but there's a difference: 2. ... de6 now suddenly seems possible because the combination that did black in there, doesn't work here. The man on c4 is isolated on the 4-line and white can't pull it because black captures over the e-line if white moves to e4. Nevertheless the move is wrong.
| 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 |