r2qkbn1/ppp1pppr/1n6/2PpP2p/7P/PQ3P2/1P1PB1P1/RNB2KNR b q - 0 10
FEN state: r2qkbn1/ppp1pppr/1n6/2PpP2p/7P/PQ3P2/1P1PB1P1/RNB2KNR b q - 0 10 ; Best move: b6d7
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at e7, black pawn at f7, black pawn at g7 and black rook at h7. Black knight at b6. White pawn at c5, black pawn at d5, white pawn at e5 and black pawn at h5. White pawn at h4. White pawn at a3, white queen at b3 and white pawn at f3. White pawn at b2, white pawn at d2, white bishop at e2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 10. Black to move.