It is playable, but not good. The bishops control the center, but the knights are still on their starting squares and it is difficult to bring the knights into play as the white pawns can chase them. This means black has difficulty to castle and his king in insecure in the center. White can proceed development: play bishops out, castle, bring rooks to the center and prepare an attack on the black king.
Is the double fianchetto system a good opening for black?
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Whenever I play chess with my grandfather, he chooses to play black and our game begins with 1. e4 b6 2. d4 Bb7 3. Nc3 g6 4. Nf6 Bg7, proceeding to play a straightforward double fianchetto system for black. He never plays any other move or those that are theoretically viable as a continuation for either Bb7 or Bg7, so I suppose he improvised that opening. He said it’s a safe opening, but I rarely ever seen it played. What do you guys think about it? How would you play against it? https://tweakbox.mobi/