rb1qk2r/p3pn1p/np2b1p1/2pp1p2/P1PP4/NP3P2/2K1PQPP/R4BNR b kq - 7 20
FEN state: rb1qk2r/p3pn1p/np2b1p1/2pp1p2/P1PP4/NP3P2/2K1PQPP/R4BNR b kq - 7 20 ; Best move: a6b4
The current state of the chess board is: Black rook at a8, black bishop at b8, black queen at d8, black king at e8 and black rook at h8. Black pawn at a7, black pawn at e7, black knight at f7 and black pawn at h7. Black knight at a6, black pawn at b6, black bishop at e6 and black pawn at g6. Black pawn at c5, black pawn at d5 and black pawn at f5. White pawn at a4, white pawn at c4 and white pawn at d4. White knight at a3, white pawn at b3 and white pawn at f3. White king at c2, white pawn at e2, white queen at f2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at f1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 7. Full move number is 20. Black to move.