| 1.f25 | - | c74? |
| 2.ed3! |
The threat is d34, starting a combination that captures both the 5-line and the 6-line. Five men overkill to be exact. Countering this threat gives guidance to black's thoughts. But everything goes wrong.
| 2. ... - de6 | 2. ... - c53 |
| 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 |