r1bq1br1/npp1kn2/3p3p/p3Np2/1P1PP3/7P/PBP3P1/RN2QKR1 b - - 0 20
FEN state: r1bq1br1/npp1kn2/3p3p/p3Np2/1P1PP3/7P/PBP3P1/RN2QKR1 b - - 0 20 ; Best move: d6e5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black bishop at f8 and black rook at g8. Black knight at a7, black pawn at b7, black pawn at c7, black king at e7 and black knight at f7. Black pawn at d6 and black pawn at h6. Black pawn at a5, white knight at e5 and black pawn at f5. White pawn at b4, white pawn at d4 and white pawn at e4. White pawn at h3. White pawn at a2, white bishop at b2, white pawn at c2 and white pawn at g2. White rook at a1, white knight at b1, white queen at e1, white king at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 20. Black to move.