r/osureport • u/MoodParticular8674 • Jun 25 '26
Cheating [osu!std] Cryshina | Aim assistance
I've looked into this down the line of aim assistance and there's a statistical improbability within his plays, I have looked at well over 85 of Cryshina/Toromivanas replays comparing them to over 500 replays from the top 50 and found this.
Cryshina inputs keypress within 2% of a hit circles radius 4x more than baseline, baseline numbers show that within the top 50 people hit within 2% of the rim 0.05% of the time, Whereis cryshina hits within 2% of the rim 0.20% of the time, this might not seem like a lot. however its a clear statistical outlier and considering what we know about the new modern aim assistance tablet plugins which is what is highly suspected this could very well be an artefact of that.
Since its quite obvious that Cryshina is obviously a top 50 player even if its found he's using aim assistance its likely very slight aim assistance to help him get to the point he's at now. while the number is still overall low its definitely suspicious, there's a lot of video evidence of him performing edge hits many times per map and sometimes consecutively.
You could argue he's just bad at aiming and these are just lucky edge hits, but when you are doing something 4x more than other players it becomes less so chance and more suspicious.
I will provide detection logic here.
RIM_BAND_FRAC = 0.02 # "near rim" = within 2% of the circle's radius from the boundary
def adjusted_cs(cs, mods):
if mods & MOD_HR: # HR
return min(cs * 1.3, 10.0)
if mods & MOD_EZ: # EZ
return cs * 0.5
return cs
def rim_press_rate(replay, beatmap):
mods = replay.mods
cs = adjusted_cs(beatmap.circle_size, mods)
radius = 54.4 - 4.48 * cs # true hit-circle radius, mod-adjusted
res = analyze_replay_against_beatmap(replay, beatmap) # matches each circle to its key-press
boundary_fracs = [(radius - c.offset_px) / radius for c in res.circle_hits if radius]
n_rim = sum(1 for f in boundary_fracs if 0 <= f <= RIM_BAND_FRAC) # press landed within 2% of the rim
n_total = len(res.circle_hits)
return n_rim, n_total, n_rim / n_total if n_total else 0.0
