3rkb1r/2p1pppp/q3b1n1/1p5n/QP1pP3/P6P/1RPP1PPR/1NB2KN1 b k - 12 18
FEN state: 3rkb1r/2p1pppp/q3b1n1/1p5n/QP1pP3/P6P/1RPP1PPR/1NB2KN1 b k - 12 18 ; Best move: a6a4
The current state of the chess board is: Black rook at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at c7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black queen at a6, black bishop at e6 and black knight at g6. Black pawn at b5 and black knight at h5. White queen at a4, white pawn at b4, black pawn at d4 and white pawn at e4. White pawn at a3 and white pawn at h3. White rook at b2, white pawn at c2, white pawn at d2, white pawn at f2, white pawn at g2 and white rook at h2. White knight at b1, white bishop at c1, white king at f1 and white knight at g1. Black kingside is the only castle move available. Half move number is 12. Full move number is 18. Black to move.