1r2kbN1/1b1q4/1p1pp2p/2p1npp1/Q1PR1P2/B1NP4/4P1PP/4KB1R b K - 0 21
FEN state: 1r2kbN1/1b1q4/1p1pp2p/2p1npp1/Q1PR1P2/B1NP4/4P1PP/4KB1R b K - 0 21 ; Best move: d7a4
The current state of the chess board is: Black rook at b8, black king at e8, black bishop at f8 and white knight at g8. Black bishop at b7 and black queen at d7. Black pawn at b6, black pawn at d6, black pawn at e6 and black pawn at h6. Black pawn at c5, black knight at e5, black pawn at f5 and black pawn at g5. White queen at a4, white pawn at c4, white rook at d4 and white pawn at f4. White bishop at a3, white knight at c3 and white pawn at d3. White pawn at e2, white pawn at g2 and white pawn at h2. White king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 21. Black to move.