r4b1r/pn2pnpp/2p3k1/Qp1p1pN1/3P1K1B/PP4PB/2P1PP1P/RN5R b - - 0 21
FEN state: r4b1r/pn2pnpp/2p3k1/Qp1p1pN1/3P1K1B/PP4PB/2P1PP1P/RN5R b - - 0 21 ; Best move: b7d6
The current state of the chess board is: Black rook at a8, black bishop at f8 and black rook at h8. Black pawn at a7, black knight at b7, black pawn at e7, black knight at f7, black pawn at g7 and black pawn at h7. Black pawn at c6 and black king at g6. White queen at a5, black pawn at b5, black pawn at d5, black pawn at f5 and white knight at g5. White pawn at d4, white king at f4 and white bishop at h4. White pawn at a3, white pawn at b3, white pawn at g3 and white bishop at h3. White pawn at c2, white pawn at e2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.