Full breakdown
Search depth across all five losses
Sage bars are healthy search (≥10 ply); brick-red bars are the collapse zone (<10 ply). All five losses reviewed show at least one such stretch — including one I initially misread.
vs Motor 0.7.0 · White (SF), moves 9–49fits pattern
move 9move 49 (mate)
3-move crash straight into mate — the sharpest of the five.
vs RubiChess 20230918 · White (SF), moves 9–67fits pattern
move 9move 67 (adjudicated)
Two separate crash windows: a brief one near move 47–50, a sustained one from move 56 onward.
vs RubiChess 20240817 · Black (SF), moves 7–87fits pattern (corrected)
move 7move 87 (mate)
Correction from the earlier draft: I first checked this game's White (RubiChess) depths and called it a "steady grind" with no clear cliff. Stockfish is actually Black in this game — checking Black's own depths shows the same late collapse as the others, concentrated around moves 77–87, right before the final mating sequence.
vs Berserk 13.0 · White (SF), moves 8–53fits pattern — most extended
move 8move 53 (adjudicated)
Moves 36–39 report the identical eval (+4.75) four times running, all at depth 1, before a hard reversal — the most unusual single detail of the five games.
vs PlentyChess 4.0.1 · White (SF), moves 8–51two separate issues
move 8move 51 (mate)
Two distinct failures in one game: a depth-24 miscalculation at move 26 (genuine deep search, not a clock issue), followed independently by a standard depth-1 crash from move 45 onward.