user-1: I play 1. d4 as White and I have success against almost all Black defences, except the Benko Gambit, where I score about 30%.
My style is that I like solid, closed, positional games if I can, but I can handle myself tactically too. However I find that I lag behind in development, and to make matters worse, even if I reach an endgame, the Benko structure is quite solid, so even here Black has good chances.
Can you suggest a variation for White that leads to a solid, positional game against the Benko Gambit?
My elo is 2050.

user9288: I didn't exactly take into account your style, but in your own interest you should be ready to play different position types. This isn't going to be so closed, but it will definitely be solid, positional, and you will need to be tactically astute in the moves that follow.
One of the best lines is the following.

d4 Nf6
c4 c5
d5 b5
cxb5 a6
bxa6 Bxa6
Nc3 d6
Nf3 g6
e4 Bxf1
Kxf1 Bg7
g3 0-0
Kg2 Nbd7
a4! 

there are some move order wrinkles possible during this but you will manage to reach this tabiya 95% of the time. From here you just have a plan to regroup and neutralise the pressure black has on your queenside. knights on b5 and c4 for example are really nice and Qe2 or Qc2 are useful to protect b2, you can also regroup the darksquared bishop to c3. Sometimes you'll move the rook to a2 and then play b3 thought care should be taken. Also developing the hrook somewhere at some point. Subsequent to consolidating you then have good chances to slowly try to make the pawn count. This is vague but you should analyse from here yourself as it's already quite deep. Hope this helps.
EDIT:
Another option which I frequently use is to simply play 3. Nf3 when you can get some closed English/Maroczy bind position type... or if black insists on playing b5 then a6 you can take all of the pawns (including c5) and black is temporarily down two pawns and will be unlikely to recover them or get sufficient compensation.

user9289: I play Benko as black and am a FM. The most trouble I have in quick games is with declined cxb5 a6 b6 line. Without the a line open I just do not have the play that Benko player craves.
Also, I noticed that stronger(IM+) players tend to go for the b6 line, while weaker players either take the pawn on a6 or decline the gambit with something else. For example allowing black to push to b4 has been good for me as black.

-1: <p>I play 1. d4 as White and I have success against almost all Black defences, except the Benko Gambit, where I score about 30%.</p>

<p>My style is that I like solid, closed, positional games if I can, but I can handle myself tactically too. However I find that I lag behind in development, and to make matters worse, even if I reach an endgame, the Benko structure is quite solid, so even here Black has good chances.</p>

<p>Can you suggest a variation for White that leads to a solid, positional game against the Benko Gambit?</p>

<p>My elo is 2050.</p>
 9288: <p>I didn't exactly take into account your style, but in your own interest you should be ready to play different position types. This isn't going to be so closed, but it will definitely be solid, positional, and you will need to be tactically astute in the moves that follow.</p>

<p>One of the best lines is the following.</p>

<ol>
<li>d4 Nf6</li>
<li>c4 c5</li>
<li>d5 b5</li>
<li>cxb5 a6</li>
<li>bxa6 Bxa6</li>
<li>Nc3 d6</li>
<li>Nf3 g6</li>
<li>e4 Bxf1</li>
<li>Kxf1 Bg7</li>
<li>g3 0-0</li>
<li>Kg2 Nbd7</li>
<li>a4! </li>
</ol>

<p>there are some move order wrinkles possible during this but you will manage to reach this tabiya 95% of the time. From here you just have a plan to regroup and neutralise the pressure black has on your queenside. knights on b5 and c4 for example are really nice and Qe2 or Qc2 are useful to protect b2, you can also regroup the darksquared bishop to c3. Sometimes you'll move the rook to a2 and then play b3 thought care should be taken. Also developing the hrook somewhere at some point. Subsequent to consolidating you then have good chances to slowly try to make the pawn count. This is vague but you should analyse from here yourself as it's already quite deep. Hope this helps.</p>

<p>EDIT:</p>

<p>Another option which I frequently use is to simply play 3. Nf3 when you can get some closed English/Maroczy bind position type... or if black insists on playing b5 then a6 you can take all of the pawns (including c5) and black is temporarily down two pawns and will be unlikely to recover them or get sufficient compensation.</p>
 9289: <p>I play Benko as black and am a FM. The most trouble I have in quick games is with declined cxb5 a6 b6 line. Without the a line open I just do not have the play that Benko player craves.</p>

<p>Also, I noticed that stronger(IM+) players tend to go for the b6 line, while weaker players either take the pawn on a6 or decline the gambit with something else. For example allowing black to push to b4 has been good for me as black.</p>
