A fianchetto is developing a bishop to the second rank on the knight’s file (g2, b2, g7 or b7) so it rakes down the long diagonal.
By playing a short pawn move (g3 or b3) and dropping the bishop behind it, you put the bishop on the longest diagonal on the board, where it can influence the centre and the opponent’s position from a safe distance.
A fianchettoed bishop also helps shelter a castled king on that side. It’s the backbone of openings like the King’s Indian, the Catalan, and the Réti.
The trade-off: if that bishop ever gets traded off or blocked, the squares of its colour around your king (the ‘holes’) can become weak — so think twice before giving it up.
Often yes — it develops the bishop to a strong, safe square and supports kingside castling. Just be careful about trading the bishop, which can leave weak squares behind.
Roughly ‘fee-an-KET-toe’ — it’s Italian for ‘little flank’.
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