r2k1b1r/p1nqpp2/4n2p/1pPbp1p1/2Q2P2/N1PP4/P3N1PP/1RBK1B1R b - - 6 21
FEN state: r2k1b1r/p1nqpp2/4n2p/1pPbp1p1/2Q2P2/N1PP4/P3N1PP/1RBK1B1R b - - 6 21 ; Best move: b5c4
The current state of the chess board is: Black rook at a8, black king at d8, black bishop at f8 and black rook at h8. Black pawn at a7, black knight at c7, black queen at d7, black pawn at e7 and black pawn at f7. Black knight at e6 and black pawn at h6. Black pawn at b5, white pawn at c5, black bishop at d5, black pawn at e5 and black pawn at g5. White queen at c4 and white pawn at f4. White knight at a3, white pawn at c3 and white pawn at d3. White pawn at a2, white knight at e2, white pawn at g2 and white pawn at h2. White rook at b1, white bishop at c1, white king at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 6. Full move number is 21. Black to move.