rnb1kb1r/3p2p1/p1p2n1p/1q2p3/1PB1P3/2P3PP/1B1PNP2/1N1K3R b - - 1 21
FEN state: rnb1kb1r/3p2p1/p1p2n1p/1q2p3/1PB1P3/2P3PP/1B1PNP2/1N1K3R b - - 1 21 ; Best move: b5c4
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at d7 and black pawn at g7. Black pawn at a6, black pawn at c6, black knight at f6 and black pawn at h6. Black queen at b5 and black pawn at e5. White pawn at b4, white bishop at c4 and white pawn at e4. White pawn at c3, white pawn at g3 and white pawn at h3. White bishop at b2, white pawn at d2, white knight at e2 and white pawn at f2. White knight at b1, white king at d1 and white rook at h1. Both players have exhausted their castles. Half move number is 1. Full move number is 21. Black to move.