White first
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Positive solution
The purpose of the white 1 wrench is obvious, to prepare for eating the central black chess tendon. Black 2 is sensitive, and can form a conversion with each other after 3 and 4.
Change Figure 1
If Black 2 is forcibly blocked, then the clouds below White 3 will flow in one go, and there will be no escape until the middle of black 19.
Variation Figure 2
Following the above figure of white 13 pull black 2 if it is turned out, the white tip 3 can also eat black chess.