r1b1k2r/pq2pp2/np1p2p1/2p3b1/P2PPNnp/1PP2PP1/3B2BP/RN2QKR1 w q - 1 20
FEN state: r1b1k2r/pq2pp2/np1p2p1/2p3b1/P2PPNnp/1PP2PP1/3B2BP/RN2QKR1 w q - 1 20 ; Best move: f3g4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7, black queen at b7, black pawn at e7 and black pawn at f7. Black knight at a6, black pawn at b6, black pawn at d6 and black pawn at g6. Black pawn at c5 and black bishop at g5. White pawn at a4, white pawn at d4, white pawn at e4, white knight at f4, black knight at g4 and black pawn at h4. White pawn at b3, white pawn at c3, white pawn at f3 and white pawn at g3. White bishop at d2, white bishop at g2 and white pawn at h2. White rook at a1, white knight at b1, white queen at e1, white king at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 20. White to move.