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I have the execution of the Monte Carlo Tree Search (MCTS) below. I need to expand it, but I don't understand steps 1 and 2.

Why does it go to the first node and then make a new node, instead of going to the deepest left leaf? I thought it needs to go to the most probable leaf.

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In step 1 of MCTS, it added a new node. Now, there are 9 cases.

enter image description here

In step 2 of MCTS, it added a new node. Now, there are 2 cases under the first node:

enter image description here

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