r1bqk1r1/1ppp1p2/p1n4n/1N2B3/3P2Pp/bP3P1B/P1PQP2P/R4KNR b q - 5 15
FEN state: r1bqk1r1/1ppp1p2/p1n4n/1N2B3/3P2Pp/bP3P1B/P1PQP2P/R4KNR b q - 5 15 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black rook at g8. Black pawn at b7, black pawn at c7, black pawn at d7 and black pawn at f7. Black pawn at a6, black knight at c6 and black knight at h6. White knight at b5 and white bishop at e5. White pawn at d4, white pawn at g4 and black pawn at h4. Black bishop at a3, white pawn at b3, white pawn at f3 and white bishop at h3. White pawn at a2, white pawn at c2, white queen at d2, white pawn at e2 and white pawn at h2. White rook at a1, white king at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 5. Full move number is 15. Black to move.