rn2k2r/pb5p/1bPp1np1/1p3p2/1PP1N3/5NP1/P3P2P/R1BQKB1R b KQ - 0 18
FEN state: rn2k2r/pb5p/1bPp1np1/1p3p2/1PP1N3/5NP1/P3P2P/R1BQKB1R b KQ - 0 18 ; Best move: f6e4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at h8. Black pawn at a7, black bishop at b7 and black pawn at h7. Black bishop at b6, white pawn at c6, black pawn at d6, black knight at f6 and black pawn at g6. Black pawn at b5 and black pawn at f5. White pawn at b4, white pawn at c4 and white knight at e4. White knight at f3 and white pawn at g3. White pawn at a2, white pawn at e2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 0. Full move number is 18. Black to move.