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In this position, why is bongclouding better than castling?

<Comment deleted by user>
<Comment deleted by user>
Ahh, wtf, sorry, can't seem to link a position that hasn't actually occured in the game.
If I read correctly, best moves are d4 (quite understandable) and a6, then 0-0, a5 and Ba5...
We are, but your analysis goes deeper.

Ke7 is missing from the top 5 until depth 17 (!), so there is no way I could think of it as a good move.

Maybe the engine foresees every piece exchanged and is just preparing the pawns endgame.
The king is safer on e7. If you castle you have a rook aiming at your pawns, and the pawn on e5 is a nuisance that restricts your wishes of bringing pieces to help the king. It's not like there's an attack or anything, but why walk into that if it only has disadvantages? On the other hand, the king on e7 connects the rooks just the same, but is also safer.

Consider the following points: White doesn't have the bishop required to target e7. The white knight would have to land on a white square to target e7, but black controls all the white squares around it with pawns. You have a black bishop to protect the diagonals going to the king, and white doesn't have an equal but opposite force. White's king is worse, because he doesn't have a great side to castle; he has to stay in the center. If he tries throwing pawns at your king, those are the pawns that make his center position bearable.
@JuicyChickenNO1 said in #8:
> The king is safer on e7. If you castle you have a rook aiming at your pawns.

And soon a Bishop. After reading your reply, it seems clear that King side pawns need some additional work to provide a safe place to the King, while center pawns are already setup.

Regarding the h Rook, Ke7 allows center development like castling, while also keeping the possibility of a future Rh3, so maybe another plus here.

Thank you for your explanation!

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