Well Black wants to play a Benoni defence after 4.d5. You can play 4.Nf3 or 4.e3 here as well.
1.d4 Nf6 2.c4 e6 3.Nc3 c5!?
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Definitely the Benoni in a different move order. Actually it looks like the Modern Benoni... no difference in move order
I saw Hikaru play it once and have messed around with it. When I put it into analysis board it does not have an actual name. Its a unique opening and I stump a lot of my competition on move 3 as they have not seen this before
Does anyone know what this opening is called and how to respond to it or variations to it.