r3kNn1/pp6/2nppp1r/2p2b1p/QqP1PP2/2NB2P1/P2P3P/R1B3KR b q - 2 16
FEN state: r3kNn1/pp6/2nppp1r/2p2b1p/QqP1PP2/2NB2P1/P2P3P/R1B3KR b q - 2 16 ; Best move: b4a4
The current state of the chess board is: Black rook at a8, black king at e8, white knight at f8 and black knight at g8. Black pawn at a7 and black pawn at b7. Black knight at c6, black pawn at d6, black pawn at e6, black pawn at f6 and black rook at h6. Black pawn at c5, black bishop at f5 and black pawn at h5. White queen at a4, black queen at b4, white pawn at c4, white pawn at e4 and white pawn at f4. White knight at c3, white bishop at d3 and white pawn at g3. White pawn at a2, white pawn at d2 and white pawn at h2. White rook at a1, white bishop at c1, white king at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 2. Full move number is 16. Black to move.