1rbq2r1/p2pkp1p/R1p1p1p1/1nP5/1B1Q3P/4PP1P/2P3B1/1N2K1NR b K - 10 23
FEN state: 1rbq2r1/p2pkp1p/R1p1p1p1/1nP5/1B1Q3P/4PP1P/2P3B1/1N2K1NR b K - 10 23 ; Best move: b5d4
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at d8 and black rook at g8. Black pawn at a7, black pawn at d7, black king at e7, black pawn at f7 and black pawn at h7. White rook at a6, black pawn at c6, black pawn at e6 and black pawn at g6. Black knight at b5 and white pawn at c5. White bishop at b4, white queen at d4 and white pawn at h4. White pawn at e3, white pawn at f3 and white pawn at h3. White pawn at c2 and white bishop at g2. White knight at b1, white king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 10. Full move number is 23. Black to move.