r1bqkbn1/p1p1ppp1/1pnp4/7p/1PP1P3/B2P2P1/P1QKNr1P/RN3B1R w q - 0 10
FEN state: r1bqkbn1/p1p1ppp1/1pnp4/7p/1PP1P3/B2P2P1/P1QKNr1P/RN3B1R w q - 0 10 ; Best move: a3b2
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at a7, black pawn at c7, black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at b6, black knight at c6 and black pawn at d6. Black pawn at h5. White pawn at b4, white pawn at c4 and white pawn at e4. White bishop at a3, white pawn at d3 and white pawn at g3. White pawn at a2, white queen at c2, white king at d2, white knight at e2, black rook at f2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 10. White to move.