4kbnr/r2npR1p/1p3Q2/pbp3p1/q7/1PpP1PPN/2P1P1BP/B4K1R b k - 1 23
FEN state: 4kbnr/r2npR1p/1p3Q2/pbp3p1/q7/1PpP1PPN/2P1P1BP/B4K1R b k - 1 23 ; Best move: a4a1
The current state of the chess board is: Black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black rook at a7, black knight at d7, black pawn at e7, white rook at f7 and black pawn at h7. Black pawn at b6 and white queen at f6. Black pawn at a5, black bishop at b5, black pawn at c5 and black pawn at g5. Black queen at a4. White pawn at b3, black pawn at c3, white pawn at d3, white pawn at f3, white pawn at g3 and white knight at h3. White pawn at c2, white pawn at e2, white bishop at g2 and white pawn at h2. White bishop at a1, white king at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 23. Black to move.