The Fianchetto Variation, Panno Variation, Donner Line is a variation of the King's Indian Defense, catalogued as ECO E63. The line runs 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. d5 Na5 9. Nd2 c5 10. Qc2 Rb8 11. b3 b5 12. Bb2 bxc4 13. bxc4 Bh6, reaching the position shown below after 26 half-moves.
White holds the centre with pawns on d5. Development is level at four minor pieces each. It is White to move after 13 moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank; White’s a-file pawn is isolated; Black’s a-file pawn is isolated; the b-file file is fully open.
On the King's Indian Defense generally: A hypermodern defense where Black allows White to build a big center, then counterattacks it.
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The Fianchetto Variation, Panno Variation, Donner Line goes 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. d5 Na5 9. Nd2 c5 10. Qc2 Rb8 11. b3 b5 12. Bb2 bxc4 13. bxc4 Bh6. It is a variation of the King's Indian Defense and is catalogued as ECO E63.
The Fianchetto Variation, Panno Variation, Donner Line is ECO E63. ECO codes group openings by their move order, so nearby codes cover closely related lines of the King's Indian Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 O-O 5. Bg2 d6 6. O-O Nc6 7. Nc3 a6 8. d5 Na5 9. Nd2 c5 10. Qc2 Rb8 11. b3 b5 12. Bb2 bxc4 13. bxc4 Bh6 at +0.62 at depth 18, which is a small but real edge for White. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
White holds the centre with pawns on d5. Development is level at four minor pieces each. It is White to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank; White’s a-file pawn is isolated; Black’s a-file pawn is isolated; the b-file file is fully open.