r1n1kb2/p1p2p1p/N3n1r1/3pp1p1/3P1PP1/PP2B2B/4P2P/RQ1bK1NR b KQq - 12 21
FEN state: r1n1kb2/p1p2p1p/N3n1r1/3pp1p1/3P1PP1/PP2B2B/4P2P/RQ1bK1NR b KQq - 12 21 ; Best move: g5f4
The current state of the chess board is: Black rook at a8, black knight at c8, black king at e8 and black bishop at f8. Black pawn at a7, black pawn at c7, black pawn at f7 and black pawn at h7. White knight at a6, black knight at e6 and black rook at g6. Black pawn at d5, black pawn at e5 and black pawn at g5. White pawn at d4, white pawn at f4 and white pawn at g4. White pawn at a3, white pawn at b3, white bishop at e3 and white bishop at h3. White pawn at e2 and white pawn at h2. White rook at a1, white queen at b1, black bishop at d1, white king at e1, white knight at g1 and white rook at h1. White kingside, white queenside and black queenside castles are available. Half move number is 12. Full move number is 21. Black to move.