How do you get the Benoni opening achievement?

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Avatar of mxm250405
On the explorer it says 1. d4 Nf6 2. c4 c5 is the Benoni Defense but I've played multiple games with this opening and I haven't gotten the achievement. Is there some kind of variation or continuation that has to be played in order to get the achievement?
Avatar of harriw

I'm not sure what is needed for the achievement, but for the position to get a Benoni structure, White needs to play 3. d5 and Black must not reply 3. ... b5, which is the Benko gambit. The main line (called Modern Benoni) is 3. ... e6. White then develops either of the knights (4. Nc3 is the main line) and then there is an exchange of pawns 4. ... exd5 5. cxd5 d6.
Black has other options for the third move, 3. ... e5 leads to Czech Benoni (pawns on c5-d6-e5, a Stonewall-type structure), while 3. ... g6 and 3. ... d6 are more waiting and lead to either of these depending on what Black does with the e-pawn.

Avatar of GM_YMe

It has to be the modern variation which is 1.d4 2.Nf6 2.c4 c5 3.d5 e6.

Avatar of browhatusernameisnttaken

Mine too I've played it many times and it's not working

Avatar of OfficialSrivatsaplayer

I also tried it, but it's not coming for me too

Avatar of DIATONIC2

I tried the old d

Avatar of DIATONIC2

Old benoni and didn't work for