I ran some tests on Nebiyu using normal chess and got some strange moves. I'm using Arena 3. All the games were normal but in the following cases, these happened:
[Event "Nebiyu 1.2 gauntlet"]
[Site "PRIVATE1"]
[Date "2011.03.21"]
[Round "3"]
[White "Nebiyu 1.2"]
[Black "Knightx 1.92"]
[Result "0-1"]
[BlackElo "2200"]
[Time "18:07:01"]
[Variation "Classical, 7.Nf3 Nf6 8.h5"]
[WhiteElo "2200"]
[TimeControl "40/240:40/240:40/240"]
[Termination "time forfeit"]
[PlyCount "2"]
[WhiteType "human"]
[BlackType "human"]
1. Nb3 1. Rh3 {(e1f1 f4d2 g2e4 d2e2 b1e1 g3g1 f1g1 e2e4 h1h2 c5d6 g1g3 e4e1
h2g2 e1g3 g2f1 g3g4 f1f2 g4e4 f2f1 e4d5) -15.05/19 3 Arena Adjudication}
0-1
[Event "Nebiyu 1.2 gauntlet"]
[Site "PRIVATE1"]
[Date "2011.03.22"]
[Round "9"]
[White "Nebiyu 1.2"]
[Black "Amyan 1.72"]
[Result "1/2-1/2"]
[BlackElo "2200"]
[Time "17:26:32"]
[Variation "Scheveningen, Fianchetto Variation, 6.g3 Nc6 7.Bg2 Qc7 8.O-O a6"]
[WhiteElo "2200"]
[TimeControl "40/240:40/240:40/240"]
[Termination "normal"]
[PlyCount "3"]
[WhiteType "human"]
[BlackType "human"]
Bf5 1. Rd5 {(c3d5 c8e6 a1d1 h5f4 e3f4 e7d6 f1c4 a7a5 e1g1 a5b4 a3b4 b7b5
c4b5 c6b4 b5c4 d8b8 f3e5 b4d5 b3b8 a8b8 c4d5) +0.85/17 5} Be6 {(a1d1 h5f4
e3f4 a7a5 b4b5 e7d6 b3b2 c6e7 d5c3 d8c7 g2g3 c7c5 a3a4 a8e8 f1d3 e7d5 c3e4)
+0.60/17 5} 1/2-1/2
Thanks.
Denis