r2qkb2/p1p1p1pr/b2p1n2/nB3p1p/1P1P1P1P/N3P3/P1PK2PR/R1BQ2N1 b q - 0 11
FEN state: r2qkb2/p1p1p1pr/b2p1n2/nB3p1p/1P1P1P1P/N3P3/P1PK2PR/R1BQ2N1 b q - 0 11 ; Best move: a6b5
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 pawn at a7, black pawn at c7, black pawn at e7, black pawn at g7 and black rook at h7. Black bishop at a6, black pawn at d6 and black knight at f6. Black knight at a5, white bishop at b5, black pawn at f5 and black pawn at h5. White pawn at b4, white pawn at d4, white pawn at f4 and white pawn at h4. White knight at a3 and white pawn at e3. White pawn at a2, white pawn at c2, white king at d2, white pawn at g2 and white rook at h2. White rook at a1, white bishop at c1, white queen at d1 and white knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 11. Black to move.