r2qkb1r/p1p4p/n2pp2n/2PP1pp1/2P1P1P1/PQNB1P1b/6NP/R3K2R b KQ - 0 18
FEN state: r2qkb1r/p1p4p/n2pp2n/2PP1pp1/2P1P1P1/PQNB1P1b/6NP/R3K2R b KQ - 0 18 ; Best move: a6c5
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at c7 and black pawn at h7. Black knight at a6, black pawn at d6, black pawn at e6 and black knight at h6. White pawn at c5, white pawn at d5, black pawn at f5 and black pawn at g5. White pawn at c4, white pawn at e4 and white pawn at g4. White pawn at a3, white queen at b3, white knight at c3, white bishop at d3, white pawn at f3 and black bishop at h3. White knight at g2 and white pawn at h2. White rook at a1, white king at e1 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.