Cerebellum says: play the French and semi-Slav

[Lyudmil Tsvetkov]

Scores are subject to the horizon effect. And the farther they are from the tips of the tree (end of book lines), the more subject to error they are, because there are branches along the way that have not been visited.

--Jon

The only sensical post I read on this thread.

depth 60 basically means nothing, if you evaluate the leaf nodes incorrectly, and if you prune away better and much better positions based on an engine's inaccurate/insufficient eval to the benefit of positions the engine considers more promising, but are actually not. Part of the mistakes could be removed due to deeper search, but a bigger part would still stay.

In the starting position there are no forced/tactical solutions, so you must rely on eval.

[corres]

This is a true but old sentence.
Moreover this is the cause why endgame database is build not from start position but from the end position. Mate, stalemate and insufficient material are very unambiguous situation.
One who want to solve chess game correctly have to follow this method.