rn3k1r/1p2pp1p/p2pbnp1/1qp4P/PPP3P1/4b3/3P1PB1/RNBQK1NR w K - 3 16
FEN state: rn3k1r/1p2pp1p/p2pbnp1/1qp4P/PPP3P1/4b3/3P1PB1/RNBQK1NR w K - 3 16 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black king at f8 and black rook at h8. Black pawn at b7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at a6, black pawn at d6, black bishop at e6, black knight at f6 and black pawn at g6. Black queen at b5, black pawn at c5 and white pawn at h5. White pawn at a4, white pawn at b4, white pawn at c4 and white pawn at g4. Black bishop at e3. White pawn at d2, white pawn at f2 and white bishop at g2. White rook at a1, white knight at b1, white bishop at c1, white queen at d1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 3. Full move number is 16. White to move.