Lack of ability

[michito744]

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This is a procedure that the zero-based-AI completely overlooked in a phase that appeared in a recent actual game.

The black player, Yu pro, had discovered the procedure at the time of the diagram below. Already the white player cannot avoid black's attack, but the AI is completely unaware of it.

Since the ladder in the diagram below holds, the black stones cannot be taken. The assumption of the calculation has been broken and it is clear that the AI's evaluation value is incorrect.

The diagram below shows an example where 28b barely found the correct answer in a 2 million search after two moves (it had not been found at the time of the 1 million search).

[michito744]

49th Meijin League, YU vs SHIDA.

KataGo_sample_20240705_0001.txt

[michito744]

If we accept the above conclusion, it would be strange if the evaluation is not reflected at the time White plays that one move before.

This kind of accumulation of missed search is frequently seen at a level that affects the win or loss (although it is far better than before).

[michito744]

I have determined that the issue was not communicated correctly and will reissue it as a new Issue.