r2qkbnr/3bp1p1/1ppp4/2B2p1p/p1BPN3/1PN1P3/P1P1QPPP/1R2KR2 b k - 0 18
FEN state: r2qkbnr/3bp1p1/1ppp4/2B2p1p/p1BPN3/1PN1P3/P1P1QPPP/1R2KR2 b k - 0 18 ; Best move: f5e4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black bishop at d7, black pawn at e7 and black pawn at g7. Black pawn at b6, black pawn at c6 and black pawn at d6. White bishop at c5, black pawn at f5 and black pawn at h5. Black pawn at a4, white bishop at c4, white pawn at d4 and white knight at e4. White pawn at b3, white knight at c3 and white pawn at e3. White pawn at a2, white pawn at c2, white queen at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at b1, white king at e1 and white rook at f1. Black kingside is the only castle move available. Half move number is 0. Full move number is 18. Black to move.