Treep defence with 5.e13

1.f25 - c64
2.ed3 - cd4!
3.hxe4 - f87
4.f3x6 - d6e5x
5.e13 - e54x
6.e23x - g98
7.h67
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White can strengthen his left wing somewhat by capturing 8.g4x6, but black can weaken the wing further and gain pace at the same time by moving ad5. There's no way white can prevent this exchange.
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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