1nb1kb1r/rp1p1p2/4p1Rp/p1p1P3/RP1N2nP/3P4/2P5/1NBQKB2 b k - 4 17
FEN state: 1nb1kb1r/rp1p1p2/4p1Rp/p1p1P3/RP1N2nP/3P4/2P5/1NBQKB2 b k - 4 17 ; Best move: c5d4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black rook at a7, black pawn at b7, black pawn at d7 and black pawn at f7. Black pawn at e6, white rook at g6 and black pawn at h6. Black pawn at a5, black pawn at c5 and white pawn at e5. White rook at a4, white pawn at b4, white knight at d4, black knight at g4 and white pawn at h4. White pawn at d3. White pawn at c2. White knight at b1, white bishop at c1, white queen at d1, white king at e1 and white bishop at f1. Black kingside is the only castle move available. Half move number is 4. Full move number is 17. Black to move.