Why is ♙d6+ the Best move here?

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Avatar of donbonsai

When I saw this puzzle I immediately thought of ♙d6+, but then I remembered that I have a bad habit of pushing meaningless checks -- it's something a lot of scrubs at my level do. I then realized that the pawn check doesn't really accomplish anything so I thought of some other moves and decided that either moving my queen out of the way of pawn attack or even ♘xd8 would be better. But lo and behold the best move was indeed ♙d6+. But why? 

I'm guessing that moving the d6 pawn allows the bishop to protect the knight on f7? Still confused about what differentiates meaningless checks from a move like this one. 

Avatar of PopcornSC

Well, for starters it's concrete. Your queen and knight are under attack but your knight is poised to capture the rook on h8. d6 *check* protects the knight with tempo which then will allow you to extricate your queen with a tempo gaining check as well, after which you can capture the rook. There might be a mate too but I'm not seeing one immediately.

Avatar of donbonsai
PopcornSC wrote:

Well, for starters it's concrete. Your queen and knight are under attack but your knight is poised to capture the rook on h8. d6 *check* protects the knight with tempo which then will allow you to extricate your queen with a tempo gaining check as well, after which you can capture the rook. There might be a mate too but I'm not seeing one immediately.

Yes, this makes sense. But difficult to see.