Hello and welcome to the forums. you can see the other thread "Beating the Semi-Slav", and try not to start new threads when there are existing ones. 5. Bg5 h6 6. Bh4! dc4 7. e4 g5 8. Bg3 b5 is the Anti-Moscow, slightly less perilous for Black than the Botvinnik, but he cannot relax too. I play 5. Bg5, which is the best move on the board (the most natural moves are always best). But it takes good prep to play. Recently White has found some small refinements in various old Meran 5. e3 Nbd7 6. Bd3 lines to make life slightly uncomfortable for Black, which explains Topalov's choice of 5.e3/6. Bd3 against Kramnik in WC match, and also popularity of 5... a6. I recommend you to see games Dreev-Bareev RusCh05, Bareev-Karjakin Beersheva05 and Sasikiran-Karjakin04 for the type of edge White is looking for in the old Meran.