r3kb2/1p1npprp/1Nb3pn/p7/3pP1P1/P1P2N2/P3BP1P/RQ2K2R w KQ - 0 20
FEN state: r3kb2/1p1npprp/1Nb3pn/p7/3pP1P1/P1P2N2/P3BP1P/RQ2K2R w KQ - 0 20 ; Best move: b6a8
The current state of the chess board is: Black rook at a8, black king at e8 and black bishop at f8. Black pawn at b7, black knight at d7, black pawn at e7, black pawn at f7, black rook at g7 and black pawn at h7. White knight at b6, black bishop at c6, black pawn at g6 and black knight at h6. Black pawn at a5. Black pawn at d4, white pawn at e4 and white pawn at g4. White pawn at a3, white pawn at c3 and white knight at f3. White pawn at a2, white bishop at e2, white pawn at f2 and white pawn at h2. White rook at a1, white queen at b1, white king at e1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 0. Full move number is 20. White to move.