r2qk3/1bppnpp1/4p2r/p4P2/pP1NP2p/n1N1bQ1P/2PPK1B1/1RB4R w q - 0 20
FEN state: r2qk3/1bppnpp1/4p2r/p4P2/pP1NP2p/n1N1bQ1P/2PPK1B1/1RB4R w q - 0 20 ; Best move: c1a3
The current state of the chess board is: Black rook at a8, black queen at d8 and black king at e8. Black bishop at b7, black pawn at c7, black pawn at d7, black knight at e7, black pawn at f7 and black pawn at g7. Black pawn at e6 and black rook at h6. Black pawn at a5 and white pawn at f5. Black pawn at a4, white pawn at b4, white knight at d4, white pawn at e4 and black pawn at h4. Black knight at a3, white knight at c3, black bishop at e3, white queen at f3 and white pawn at h3. White pawn at c2, white pawn at d2, white king at e2 and white bishop at g2. White rook at b1, white bishop at c1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 20. White to move.