rn2k2N/p1p5/1p2b2p/3ppp2/1PPq2r1/3P1P2/NB1K3P/R2Q1B1R b q - 1 21
FEN state: rn2k2N/p1p5/1p2b2p/3ppp2/1PPq2r1/3P1P2/NB1K3P/R2Q1B1R b q - 1 21 ; Best move: d4b2
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8 and white knight at h8. Black pawn at a7 and black pawn at c7. Black pawn at b6, black bishop at e6 and black pawn at h6. Black pawn at d5, black pawn at e5 and black pawn at f5. White pawn at b4, white pawn at c4, black queen at d4 and black rook at g4. White pawn at d3 and white pawn at f3. White knight at a2, white bishop at b2, white king at d2 and white pawn at h2. White rook at a1, white queen at d1, white bishop at f1 and white rook at h1. Black queenside is the only castle move available. Half move number is 1. Full move number is 21. Black to move.