rn2k3/3pp1bp/b1p3n1/qp2Np1P/QP4r1/2PP2pR/P2NP3/1RB1KB2 w q - 1 23
FEN state: rn2k3/3pp1bp/b1p3n1/qp2Np1P/QP4r1/2PP2pR/P2NP3/1RB1KB2 w q - 1 23 ; Best move: a4a5
The current state of the chess board is: Black rook at a8, black knight at b8 and black king at e8. Black pawn at d7, black pawn at e7, black bishop at g7 and black pawn at h7. Black bishop at a6, black pawn at c6 and black knight at g6. Black queen at a5, black pawn at b5, white knight at e5, black pawn at f5 and white pawn at h5. White queen at a4, white pawn at b4 and black rook at g4. White pawn at c3, white pawn at d3, black pawn at g3 and white rook at h3. White pawn at a2, white knight at d2 and white pawn at e2. White rook at b1, white bishop at c1, white king at e1 and white bishop at f1. Black queenside is the only castle move available. Half move number is 1. Full move number is 23. White to move.