rn2kr2/p1qb1p1p/3pp3/1pp1b3/1n3PP1/NQPP4/P1NK3P/R1B2B1R b q - 0 18
FEN state: rn2kr2/p1qb1p1p/3pp3/1pp1b3/1n3PP1/NQPP4/P1NK3P/R1B2B1R b q - 0 18 ; Best move: e5f4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and black rook at f8. Black pawn at a7, black queen at c7, black bishop at d7, black pawn at f7 and black pawn at h7. Black pawn at d6 and black pawn at e6. Black pawn at b5, black pawn at c5 and black bishop at e5. Black knight at b4, white pawn at f4 and white pawn at g4. White knight at a3, white queen at b3, white pawn at c3 and white pawn at d3. White pawn at a2, white knight at c2, white king at d2 and white pawn at h2. White rook at a1, white bishop at c1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 18. Black to move.