r1bqk1r1/p2pb3/1p5P/2p1ppp1/BnPPP3/P2N1N2/1P3P1P/R1BQKRn1 w q - 0 23
FEN state: r1bqk1r1/p2pb3/1p5P/2p1ppp1/BnPPP3/P2N1N2/1P3P1P/R1BQKRn1 w q - 0 23 ; Best move: a3b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8 and black rook at g8. Black pawn at a7, black pawn at d7 and black bishop at e7. Black pawn at b6 and white pawn at h6. Black pawn at c5, black pawn at e5, black pawn at f5 and black pawn at g5. White bishop at a4, black knight at b4, white pawn at c4, white pawn at d4 and white pawn at e4. White pawn at a3, white knight at d3 and white knight at f3. White pawn at b2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1, white rook at f1 and black knight at g1. Black queenside is the only castle move available. Half move number is 0. Full move number is 23. White to move.