rq2k1n1/1b2bp2/nppp1RP1/pP4pP/P3p3/2P4N/R2PP2P/1NBQKB2 b q - 4 18
FEN state: rq2k1n1/1b2bp2/nppp1RP1/pP4pP/P3p3/2P4N/R2PP2P/1NBQKB2 b q - 4 18 ; Best move: g8f6
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8 and black knight at g8. Black bishop at b7, black bishop at e7 and black pawn at f7. Black knight at a6, black pawn at b6, black pawn at c6, black pawn at d6, white rook at f6 and white pawn at g6. Black pawn at a5, white pawn at b5, black pawn at g5 and white pawn at h5. White pawn at a4 and black pawn at e4. White pawn at c3 and white knight at h3. White rook at a2, white pawn at d2, white pawn at e2 and white pawn at h2. White knight at b1, white bishop at c1, white queen at d1, white king at e1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 4. Full move number is 18. Black to move.