4kb2/r1pq1pp1/3r2Nn/1p1pn2b/p2PpP1P/N1P3P1/PP2P3/2R1KB1R b - - 0 21
FEN state: 4kb2/r1pq1pp1/3r2Nn/1p1pn2b/p2PpP1P/N1P3P1/PP2P3/2R1KB1R b - - 0 21 ; Best move: e5g6
The current state of the chess board is: Black king at e8 and black bishop at f8. Black rook at a7, black pawn at c7, black queen at d7, black pawn at f7 and black pawn at g7. Black rook at d6, white knight at g6 and black knight at h6. Black pawn at b5, black pawn at d5, black knight at e5 and black bishop at h5. Black pawn at a4, white pawn at d4, black pawn at e4, white pawn at f4 and white pawn at h4. White knight at a3, white pawn at c3 and white pawn at g3. White pawn at a2, white pawn at b2 and white pawn at e2. White rook at c1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 0. Full move number is 21. Black to move.