4k2r/3r1pb1/1pp1p1pB/3p4/1q1PnPPp/PPP5/3NN2P/R2K1B1R b - - 4 21
FEN state: 4k2r/3r1pb1/1pp1p1pB/3p4/1q1PnPPp/PPP5/3NN2P/R2K1B1R b - - 4 21 ; Best move: b4f8
The current state of the chess board is: Black king at e8 and black rook at h8. Black rook at d7, black pawn at f7 and black bishop at g7. Black pawn at b6, black pawn at c6, black pawn at e6, black pawn at g6 and white bishop at h6. Black pawn at d5. Black queen at b4, white pawn at d4, black knight at e4, white pawn at f4, white pawn at g4 and black pawn at h4. White pawn at a3, white pawn at b3 and white pawn at c3. White knight at d2, white knight at e2 and white pawn at h2. White rook at a1, white king at d1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 21. Black to move.