---
# edu-7lu6
title: 'Write §12: Exercise 4 — replace rollout with the value network'
status: completed
type: task
priority: normal
created_at: 2026-03-13T20:03:17Z
updated_at: 2026-03-16T01:31:54Z
parent: edu-coqp
---

Exercise: substitute random rollout in MCTS with a neural-network value estimate; compare strength before and after.

## Summary of Changes

Wrote full content for §12: Exercise 4 covering PUCT formula, replacing random rollouts with value network evaluation, adding policy priors to MCTS nodes, modified MCTS code, and pure vs network-guided MCTS comparison.