2rn1bnr/1p1k3p/q3Bp2/p1p3p1/P3RPP1/3bP2P/NP1P4/R1BQKR2 b Q - 4 21
FEN state: 2rn1bnr/1p1k3p/q3Bp2/p1p3p1/P3RPP1/3bP2P/NP1P4/R1BQKR2 b Q - 4 21 ; Best move: d8e6
The current state of the chess board is: Black rook at c8, black knight at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black king at d7 and black pawn at h7. Black queen at a6, white bishop at e6 and black pawn at f6. Black pawn at a5, black pawn at c5 and black pawn at g5. White pawn at a4, white rook at e4, white pawn at f4 and white pawn at g4. Black bishop at d3, white pawn at e3 and white pawn at h3. White knight at a2, white pawn at b2 and white pawn at d2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at f1. White queenside is the only castle move available. Half move number is 4. Full move number is 21. Black to move.