rn1Bk1n1/p1pb1pbr/6p1/1P1p2q1/2PPpNpP/1P2P3/4KPB1/RN1Q1R2 b q - 0 20
FEN state: rn1Bk1n1/p1pb1pbr/6p1/1P1p2q1/2PPpNpP/1P2P3/4KPB1/RN1Q1R2 b q - 0 20 ; Best move: g5d8
The current state of the chess board is: Black rook at a8, black knight at b8, white bishop at d8, black king at e8 and black knight at g8. Black pawn at a7, black pawn at c7, black bishop at d7, black pawn at f7, black bishop at g7 and black rook at h7. Black pawn at g6. White pawn at b5, black pawn at d5 and black queen at g5. White pawn at c4, white pawn at d4, black pawn at e4, white knight at f4, black pawn at g4 and white pawn at h4. White pawn at b3 and white pawn at e3. White king at e2, white pawn at f2 and white bishop at g2. White rook at a1, white knight at b1, white queen at d1 and white rook at f1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. Black to move.