rn2kbr1/p1p1qpp1/b5p1/1p1pp3/PP2P2P/3B2n1/2PP1PP1/RNB1K1NR b q - 0 12
FEN state: rn2kbr1/p1p1qpp1/b5p1/1p1pp3/PP2P2P/3B2n1/2PP1PP1/RNB1K1NR b q - 0 12 ; Best move: d5e4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black queen at e7, black pawn at f7 and black pawn at g7. Black bishop at a6 and black pawn at g6. Black pawn at b5, black pawn at d5 and black pawn at e5. White pawn at a4, white pawn at b4, white pawn at e4 and white pawn at h4. White bishop at d3 and black knight at g3. White pawn at c2, white pawn at d2, white pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, 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 12. Black to move.