r3k2r/1ppb1np1/p3p3/N1bp2qp/PnQ1P2P/3P2P1/R4P1R/1NB1KB2 w - - 1 21
FEN state: r3k2r/1ppb1np1/p3p3/N1bp2qp/PnQ1P2P/3P2P1/R4P1R/1NB1KB2 w - - 1 21 ; Best move: c4c5
The current state of the chess board is: Black rook at a8, black king at e8 and black rook at h8. Black pawn at b7, black pawn at c7, black bishop at d7, black knight at f7 and black pawn at g7. Black pawn at a6 and black pawn at e6. White knight at a5, black bishop at c5, black pawn at d5, black queen at g5 and black pawn at h5. White pawn at a4, black knight at b4, white queen at c4, white pawn at e4 and white pawn at h4. White pawn at d3 and white pawn at g3. White rook at a2, white pawn at f2 and white rook at h2. White knight at b1, white bishop at c1, white king at e1 and white bishop at f1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. White to move.