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Dvoretsky's method

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![e2e9c4c3-ad4c-4cce-934f-d15f7ce110b9.png](https://image.lichess1.org/display?fmt=png&h=0&op=resize&path=0apfqafLLsjT.png&w=864&sig=ef1f8041bd8d758e9a395dc4159ebdf840636c08) ![a4ab3dd0-ecbd-4a32-b4e9-f272e2c2a0e8.png](https://image.lichess1.org/display?fmt=png&h=0&op=resize&path=VbtL8-WrjanZ.png&w=864&sig=512f4cc76334fcdc2cb788e2b57ec36db522c4b3)
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