Note the symmetry in the diagrammed position. It was even more striking before Black's last move, 16...Rcd8, when the move 16...Bb7 would have achieved perfect symmetry.
The primary tactical consideration for both sides is the sequence starting Nxd5 (or ...Nxd4 for Black), followed by advancing the e-Pawn two squares after the capture. I decided that 17.Nxd5 was premature and played 17.Rfd1 instead, judging that 17...Nxd4 was also premature. My opponent decided otherwise, played that move, and ended up with a long-lasting initiative that eventually netted a Pawn. Here's the full game score, courtesy SchemingMind.com.
[Event "2009 Chess960 Dropout Tournament, Round 5"]
[FEN "brnqnkrb/pppppppp/8/8/8/8/PPPPPPPP/BRNQNKRB w KQkq - 0 1"]
1.d4 d5 2.Ncd3 O-O 3.Nf3 b6 4.b3 Ncd6 5.O-O g6 6.g3 Ne4 7.Nfe5 N8d6 8.f3 Ng5 9.Bg2 Ne6 10.Qd2 f6 11.Ng4 Bg7 12.Bh3 Ng5 13.Bg2 Qd7 14.Rbc1 Nf5 15.Bb2 Rbc8 16.Nf4 Rcd8 17.Rfd1 Nxd4 18.Bxd4 e5 19.h4 Nf7 20.h5 g5 21.Bh3 Qd6 22.Ne3 Nh6 23.Ne6 exd4 24.Qxd4 Rde8 25.Nxf8 Qxg3+ 26.Bg2 f5 27.Qd3 Bxf8 28.Nxf5 Nxf5 29.Qxf5 Rxe2 30.Qh3 Qf4 31.Qg4 Qe3+ 32.Kh1 Bd6 33.h6 d4 34.Qc8+ Kf7 35.Qf5+ Ke8 36.Qd3 Qxd3 37.Rxd3 Bf4 38.Rcd1 Be3 39.Rxd4 Bxd4 40.Rxd4 Ke7 41.Rc4 c5 42.a3 Bd5 43.Rc3 Re6 44.Kg1 Rxh6 45.f4 Bxg2 46.Kxg2 g4 47.a4 Re6 48.Kg3 h5 49.a5 Re2 0-1
How could the better developed side end up tactically worse in a symmetrical position? That is a question for which I have no answer.