r1bqkr2/1p1pppb1/3n3p/1Bp3P1/3PPNN1/Q7/P1P2P2/R5KR b q - 0 21
FEN state: r1bqkr2/1p1pppb1/3n3p/1Bp3P1/3PPNN1/Q7/P1P2P2/R5KR b q - 0 21 ; Best move: a8a3
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 f8. Black pawn at b7, black pawn at d7, black pawn at e7, black pawn at f7 and black bishop at g7. Black knight at d6 and black pawn at h6. White bishop at b5, black pawn at c5 and white pawn at g5. White pawn at d4, white pawn at e4, white knight at f4 and white knight at g4. White queen at a3. White pawn at a2, white pawn at c2 and white pawn at f2. White rook at a1, white king at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.