when there are any more then 30 moves the number of possible combinations for moves is so large that stock fish doesn't have as much data because here are so many more possibilities to learn that might not be learned.
Why is Stockfish struggling to understand this endgame on low depth?
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https://www.chess.com/analysis/game/live/120051922132?tab=review
After move 57, it seems like black has a easy win because the king will build the bridge and promote. But Stockfish doesn't see this giving only a -2 on low depth. Further Stockfish give 8/8/8/5K2/7k/R7/6pp/8 w - - 0 1 a 0:0 on low depth when it is completely winning for black why?