Well first, Bb4+ is a mistake because c3 will be coming and will make black lose momentum of the game by bringing back the bishop. The computer suggested e5 probably to activate the queen and light squared bishop by recapturing,but i'm not sure.I would have played Qh4+ to forcefully move the white king,then probably push e5 or Nf6 for development instead of Bb4+.Hope this was helpful! ;)
Question about King's pawn opening
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i am playing games and then going over the Analysis and trying to understand where i went wrong based on the recommendations of the engine, but sometimes it is difficult to understand the recommendations. here i am playing as Black, the recommendation is to advance to d5. however this will just be taken and that will in turn put pressure on the knight on c6, who will have to retreat leading to the loss of the pawn on e5. so what is the logic behind this 'perfect' move. i must be missing something?