r1b1kb1r/pp1n4/n7/2p2p1p/P1Ppp2P/3PPP2/RP2KN1P/2B2BNR b q - 1 16
FEN state: r1b1kb1r/pp1n4/n7/2p2p1p/P1Ppp2P/3PPP2/RP2KN1P/2B2BNR b q - 1 16 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7 and black knight at d7. Black knight at a6. Black pawn at c5, black pawn at f5 and black pawn at h5. White pawn at a4, white pawn at c4, black pawn at d4, black pawn at e4 and white pawn at h4. White pawn at d3, white pawn at e3 and white pawn at f3. White rook at a2, white pawn at b2, white king at e2, white knight at f2 and white pawn at h2. White bishop at c1, white bishop at f1, white knight at g1 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.