r1b1kb2/p3n1r1/BN1ppp1p/6p1/3p1PPP/2Q1P2N/PPK5/R1B4R w q - 1 23
FEN state: r1b1kb2/p3n1r1/BN1ppp1p/6p1/3p1PPP/2Q1P2N/PPK5/R1B4R w q - 1 23 ; Best move: a6b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black bishop at f8. Black pawn at a7, black knight at e7 and black rook at g7. White bishop at a6, white knight at b6, black pawn at d6, black pawn at e6, black pawn at f6 and black pawn at h6. Black pawn at g5. Black pawn at d4, white pawn at f4, white pawn at g4 and white pawn at h4. White queen at c3, white pawn at e3 and white knight at h3. White pawn at a2, white pawn at b2 and white king at c2. White rook at a1, white bishop at c1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 23. White to move.