r3k3/p4p1r/bpp3p1/4P2p/P1P1PNn1/q1bN4/1P1PK1PP/R1BQ1BR1 w q - 3 17
FEN state: r3k3/p4p1r/bpp3p1/4P2p/P1P1PNn1/q1bN4/1P1PK1PP/R1BQ1BR1 w q - 3 17 ; Best move: a1a3
The current state of the chess board is: Black rook at a8 and black king at e8. Black pawn at a7, black pawn at f7 and black rook at h7. Black bishop at a6, black pawn at b6, black pawn at c6 and black pawn at g6. White pawn at e5 and black pawn at h5. White pawn at a4, white pawn at c4, white pawn at e4, white knight at f4 and black knight at g4. Black queen at a3, black bishop at c3 and white knight at d3. White pawn at b2, white pawn at d2, white king at e2, white pawn at g2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 3. Full move number is 17. White to move.