Queens Gambit declined semi slav defence

Queens Gambit is a Beautiful opening but slav and semi slav found to be a great Equalizer against white advantage in queens Gambit opening moreover Black seems to have got an edge over white with compact pawn structure..

I havent lost any games after i plays Semi slav defence here in chess.com

The most disadvantage of semi slav defence is Light squared Bishop but if first plays Bf5 then play e6 its great position for black as far as im concerned...

I may be wrong viewers comments needed ..

You're making a mistake on move 3. You should play Nf6.

White is much better here.

The Slav proper:

The Semi-Slav:

The main variation of the semi-slav is the Meran variation where the light squared bishop in the semi-slav is fianchettoed.