r1bq3r/ppn1kpb1/3p4/1Np2npp/1PP1P3/3KP2P/P4PP1/R1BQ1BNR w - - 0 20
FEN state: r1bq3r/ppn1kpb1/3p4/1Np2npp/1PP1P3/3KP2P/P4PP1/R1BQ1BNR w - - 0 20 ; Best move: b5c7
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black rook at h8. Black pawn at a7, black pawn at b7, black knight at c7, black king at e7, black pawn at f7 and black bishop at g7. Black pawn at d6. White knight at b5, black pawn at c5, black knight at f5, black pawn at g5 and black pawn at h5. White pawn at b4, white pawn at c4 and white pawn at e4. White king at d3, white pawn at e3 and white pawn at h3. White pawn at a2, white pawn at f2 and white pawn at g2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1, white knight at g1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 20. White to move.