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Alekhine defence 5...g6 is playable?

With black. 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4. Nf3 dxe5 5. Nxe5 i want to becomeva specialist of 5...g6. World champ sometimes plays ...c6but i want to know if 5...g6 can also be good(i know white has small edge but is it playable for a life repertoire?). What is wrong with 5...g6 instead of 5...c6?
Well, often 5. g6 and 5. c6 transpose, as 5. g6 6. bc4 c6 is black's main move. Black's score in high level games with g6 is kind of abysmal. Often play continues 6. bc4 c6 7. 0-0 bg7 8. re1 0-0 9. c3 (more common online) be6 and black really just doesnt have much. The bishop cannot go to f5 because g4 comes with tempo, and honestly black doesn't get anything. after 5. c6 6. bc4 black plays nd7, and can try to get the knight off of e5, then goes for bf5 and has some more activity. I would think if you like fianchettoing in the Alekhine, you could just play 4. g6, where after 5. bc4 nb6 doesnt drop f7.
I was looking at it with opening explorer and I think g6 could be a good move order because after 5...c6, White usually goes for Be2 and c4 -- which Stockfish is no fan of for Black! But after 5...g6 White often plays Bc4, which means c4 is not coming. And if White insists on playing the Be2 + c4 plan -- Black can often play c7-c5 in one shot, like in this game: lichess.org/0EccPzHo#19

So I think you are on to something with g6 over c6.
Even 5...Nd7 is playable: black can defend 6 Nxf7, see Rozentalis-Sokolov

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