1nb1kb1r/4n1pp/3p1pr1/q1p1p3/1pR1P1P1/P2N1Q1B/3P1P1P/2BK1R2 w k - 0 23
FEN state: 1nb1kb1r/4n1pp/3p1pr1/q1p1p3/1pR1P1P1/P2N1Q1B/3P1P1P/2BK1R2 w k - 0 23 ; Best move: a3b4
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black knight at e7, black pawn at g7 and black pawn at h7. Black pawn at d6, black pawn at f6 and black rook at g6. Black queen at a5, black pawn at c5 and black pawn at e5. Black pawn at b4, white rook at c4, white pawn at e4 and white pawn at g4. White pawn at a3, white knight at d3, white queen at f3 and white bishop at h3. White pawn at d2, white pawn at f2 and white pawn at h2. White bishop at c1, white king at d1 and white rook at f1. Black kingside is the only castle move available. Half move number is 0. Full move number is 23. White to move.