r2q1bnr/2npp2p/b2k1pp1/2pN4/P4PP1/3PB2P/P5B1/RQ3KNR w - - 1 20
FEN state: r2q1bnr/2npp2p/b2k1pp1/2pN4/P4PP1/3PB2P/P5B1/RQ3KNR w - - 1 20 ; Best move: b1b6
The current state of the chess board is: Black rook at a8, black queen at d8, black bishop at f8, black knight at g8 and black rook at h8. Black knight at c7, black pawn at d7, black pawn at e7 and black pawn at h7. Black bishop at a6, black king at d6, black pawn at f6 and black pawn at g6. Black pawn at c5 and white knight at d5. White pawn at a4, white pawn at f4 and white pawn at g4. White pawn at d3, white bishop at e3 and white pawn at h3. White pawn at a2 and white bishop at g2. White rook at a1, white queen at b1, white king at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 20. White to move.