r1bqkbn1/1pp3pr/2np3p/p4p2/3P4/P1P1BKPP/1P2P2R/RN1Q1BN1 b q - 0 10
FEN state: r1bqkbn1/1pp3pr/2np3p/p4p2/3P4/P1P1BKPP/1P2P2R/RN1Q1BN1 b q - 0 10 ; Best move: g8f6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at b7, black pawn at c7, black pawn at g7 and black rook at h7. Black knight at c6, black pawn at d6 and black pawn at h6. Black pawn at a5 and black pawn at f5. White pawn at d4. White pawn at a3, white pawn at c3, white bishop at e3, white king at f3, white pawn at g3 and white pawn at h3. White pawn at b2, white pawn at e2 and white rook at h2. White rook at a1, white knight at b1, white queen at d1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.