r2k1nnr/qp1b2pp/4pp2/1N1pB1b1/p1pP1NPP/6Q1/PPP1PP2/R3KB1R b - - 15 20
FEN state: r2k1nnr/qp1b2pp/4pp2/1N1pB1b1/p1pP1NPP/6Q1/PPP1PP2/R3KB1R b - - 15 20 ; Best move: a7a5
The current state of the chess board is: Black rook at a8, black king at d8, black knight at f8, black knight at g8 and black rook at h8. Black queen at a7, black pawn at b7, black bishop at d7, black pawn at g7 and black pawn at h7. Black pawn at e6 and black pawn at f6. White knight at b5, black pawn at d5, white bishop at e5 and black bishop at g5. Black pawn at a4, black pawn at c4, white pawn at d4, white knight at f4, white pawn at g4 and white pawn at h4. White queen at g3. White pawn at a2, white pawn at b2, white pawn at c2, white pawn at e2 and white pawn at f2. White rook at a1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 15. Full move number is 20. Black to move.