r1b2kn1/1p1p1p2/1Bp3Pr/p5bp/P1P1p3/3P2PP/5K1R/RN1QNB2 b - - 6 21
FEN state: r1b2kn1/1p1p1p2/1Bp3Pr/p5bp/P1P1p3/3P2PP/5K1R/RN1QNB2 b - - 6 21 ; Best move: g8f6
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at f8 and black knight at g8. Black pawn at b7, black pawn at d7 and black pawn at f7. White bishop at b6, black pawn at c6, white pawn at g6 and black rook at h6. Black pawn at a5, black bishop at g5 and black pawn at h5. White pawn at a4, white pawn at c4 and black pawn at e4. White pawn at d3, white pawn at g3 and white pawn at h3. White king at f2 and white rook at h2. White rook at a1, white knight at b1, white queen at d1, white knight at e1 and white bishop at f1. Both players have exhausted their castles. Half move number is 6. Full move number is 21. Black to move.