1rbq1b1r/p1p1kppp/n2p1n2/8/PPQBP1P1/R3P2P/3P4/1N2KBNR b K - 0 18
FEN state: 1rbq1b1r/p1p1kppp/n2p1n2/8/PPQBP1P1/R3P2P/3P4/1N2KBNR b K - 0 18 ; Best move: a6b4
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at c7, black king at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6, black pawn at d6 and black knight at f6. White pawn at a4, white pawn at b4, white queen at c4, white bishop at d4, white pawn at e4 and white pawn at g4. White rook at a3, white pawn at e3 and white pawn at h3. White pawn at d2. White knight at b1, white king at e1, white bishop at f1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 18. Black to move.