r3k1n1/4p1br/p1n1Np2/PP1p2p1/1P4qp/3KP3/R2P1P1P/2B2B1R b - - 2 21
FEN state: r3k1n1/4p1br/p1n1Np2/PP1p2p1/1P4qp/3KP3/R2P1P1P/2B2B1R b - - 2 21 ; Best move: g4c4
The current state of the chess board is: Black rook at a8, black king at e8 and black knight at g8. Black pawn at e7, black bishop at g7 and black rook at h7. Black pawn at a6, black knight at c6, white knight at e6 and black pawn at f6. White pawn at a5, white pawn at b5, black pawn at d5 and black pawn at g5. White pawn at b4, black queen at g4 and black pawn at h4. White king at d3 and white pawn at e3. White rook at a2, white pawn at d2, white pawn at f2 and white pawn at h2. White bishop at c1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 2. Full move number is 21. Black to move.