rn1qkb1r/pppbppp1/8/3p3p/2P1nP2/4QK1N/PP1PP1PP/RNB2BR1 b q - 4 10
FEN state: rn1qkb1r/pppbppp1/8/3p3p/2P1nP2/4QK1N/PP1PP1PP/RNB2BR1 b q - 4 10 ; Best move: d7g4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at c7, black bishop at d7, black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at d5 and black pawn at h5. White pawn at c4, black knight at e4 and white pawn at f4. White queen at e3, white king at f3 and white knight at h3. White pawn at a2, white pawn at b2, white pawn at d2, white pawn at e2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 4. Full move number is 10. Black to move.