r2qkb2/7r/nP2p3/p1pp1Ppp/P3n1pP/N7/QP1PN3/R1BK1B1R b q - 1 16
FEN state: r2qkb2/7r/nP2p3/p1pp1Ppp/P3n1pP/N7/QP1PN3/R1BK1B1R b q - 1 16 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8 and black bishop at f8. Black rook at h7. Black knight at a6, white pawn at b6 and black pawn at e6. Black pawn at a5, black pawn at c5, black pawn at d5, white pawn at f5, black pawn at g5 and black pawn at h5. White pawn at a4, black knight at e4, black pawn at g4 and white pawn at h4. White knight at a3. White queen at a2, white pawn at b2, white pawn at d2 and white knight at e2. White rook at a1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 16. Black to move.