r1bqkbn1/pppppppr/7p/7Q/4P3/2P4P/PPnP1PPR/RNBK1BN1 b q - 4 6
FEN state: r1bqkbn1/pppppppr/7p/7Q/4P3/2P4P/PPnP1PPR/RNBK1BN1 b q - 4 6 ; Best move: c2a1
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at a7, black pawn at b7, black pawn at c7, black pawn at d7, black pawn at e7, black pawn at f7, black pawn at g7 and black rook at h7. Black pawn at h6. White queen at h5. White pawn at e4. White pawn at c3 and white pawn at h3. White pawn at a2, white pawn at b2, black knight at c2, white pawn at d2, white pawn at f2, white pawn at g2 and white rook at h2. White rook at a1, white knight at b1, white bishop at c1, white king at d1, white bishop at f1 and white knight at g1. Black queenside is the only castle move available. Half move number is 4. Full move number is 6. Black to move.