4k1nr/pprb2p1/n2bpp2/P1pp1P2/1PP4P/1R3NpB/3PP3/1NBK3R b k - 1 18
FEN state: 4k1nr/pprb2p1/n2bpp2/P1pp1P2/1PP4P/1R3NpB/3PP3/1NBK3R b k - 1 18 ; Best move: c5b4
The current state of the chess board is: Black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black pawn at b7, black rook at c7, black bishop at d7 and black pawn at g7. Black knight at a6, black bishop at d6, black pawn at e6 and black pawn at f6. White pawn at a5, black pawn at c5, black pawn at d5 and white pawn at f5. White pawn at b4, white pawn at c4 and white pawn at h4. White rook at b3, white knight at f3, black pawn at g3 and white bishop at h3. White pawn at d2 and white pawn at e2. White knight at b1, white bishop at c1, white king at d1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 18. Black to move.