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Add minimax value x_ to classic search nodes#2404

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mooskagh wants to merge 2 commits intoLeelaChessZero:masterfrom
mooskagh:minimax-20260325
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Add minimax value x_ to classic search nodes#2404
mooskagh wants to merge 2 commits intoLeelaChessZero:masterfrom
mooskagh:minimax-20260325

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Propagate a pure minimax value alongside the averaged Q during backpropagation. Efficiently updates by only rescanning children when the previously-best child worsens. Displayed in verbose stats.

Propagate a pure minimax value alongside the averaged Q during
backpropagation. Efficiently updates by only rescanning children
when the previously-best child worsens. Displayed in verbose stats.
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