Treep defence with 5.ge4

1.f25 - c64
2.ed3 - cd4!
3.hxe4 - f87
4.f3x6 - d6e5x
5.ge4
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The agressive 6. ...d86 is possible because black's e-line is not in danger. To line up a phalanx, white must force de6. But f56 ends in disaster, and f46 (whether or not preceded by d34), leaves white with insufficient means to capture the e-line. Black's threat leaves white hardly any other way out than the above, though variations in pace remain possible..
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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