r1b1k2r/p5b1/n2pp2p/qpp2pp1/1Q1PN3/N1P1P1PP/PP1BBP1n/2R1KR2 b kq - 1 21
FEN state: r1b1k2r/p5b1/n2pp2p/qpp2pp1/1Q1PN3/N1P1P1PP/PP1BBP1n/2R1KR2 b kq - 1 21 ; Best move: c5b4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at h8. Black pawn at a7 and black bishop at g7. Black knight at a6, black pawn at d6, black pawn at e6 and black pawn at h6. Black queen at a5, black pawn at b5, black pawn at c5, black pawn at f5 and black pawn at g5. White queen at b4, white pawn at d4 and white knight at e4. White knight at a3, white pawn at c3, white pawn at e3, white pawn at g3 and white pawn at h3. White pawn at a2, white pawn at b2, white bishop at d2, white bishop at e2, white pawn at f2 and black knight at h2. White rook at c1, white king at e1 and white rook at f1. Black kingside and black queenside castles are available. Half move number is 1. Full move number is 21. Black to move.