Coordbashing = 0?

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UberPiggy

55 posts

UberPiggy

#1 h Apr 23, 2025, 10:45 PM

Y by

Hi,

I just received my USAJMO score distribution: 000 701 (very cursed I know)

The thing is, I solved #5 (Geometry) by using Cartesian coordinates and tried to show a lot of detail in my calculations. I don't think I mislabeled the pages or anything either. I don't have the scans, but does anyone know why this might be the case? Thank you!

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elasticwealth

342 posts

elasticwealth

#2 h Apr 23, 2025, 10:46 PM • 3 Y

Y by Exponent11, aidan0626, OronSH

a 99% complete bash typically earns a zero

This post has been edited 1 time. Last edited by elasticwealth, Apr 23, 2025, 10:46 PM

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UberPiggy

55 posts

UberPiggy

#3 h Apr 23, 2025, 10:49 PM • 1 Y

Y by Exponent11

Oh, that's unfortunate. I'll keep that in mind for next time, thank you!

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averageguy

42 posts

averageguy

#4 h Apr 23, 2025, 10:49 PM • 1 Y

Y by Exponent11

I did the same thing and got a 0 for that as well. Maybe doing a cordbash just gets you a 0?

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MajesticCheese

26 posts

MajesticCheese

#5 h Apr 23, 2025, 10:53 PM • 3 Y

Y by Exponent11, jcoons91, Pengu14

I coordbashed and got a 7 uhhh

maybe something went wrong?

This post has been edited 1 time. Last edited by MajesticCheese, Apr 23, 2025, 10:53 PM

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elasticwealth

342 posts

elasticwealth

#6 h Apr 23, 2025, 11:01 PM • 3 Y

Y by Exponent11, jcoons91, aidan0626

a coordbash that 100% works gets a 7
any small issues = zero (I've heard)

This post has been edited 1 time. Last edited by elasticwealth, Apr 23, 2025, 11:01 PM
Reason: typo

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llddmmtt1

427 posts

llddmmtt1

#7 h Apr 23, 2025, 11:44 PM • 3 Y

Y by jcoons91, aidan0626, KevinChen_Yay

bash is either 0 or 7, no in between unless you make a nontrivial synthetic observation

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EZ588

41 posts

EZ588

#8 h Apr 24, 2025, 12:19 AM

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my incomplete barybash got a 1

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KevinChen_Yay

242 posts

KevinChen_Yay

#9 h Apr 24, 2025, 1:00 AM

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@above

llddmmtt1 wrote:

nontrivial synthetic observation

probably right?

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DottedCaculator

7357 posts

DottedCaculator

#10 h Apr 24, 2025, 1:19 AM

Y by

llddmmtt1 wrote:

bash is either 0 or 7, no in between unless you make a nontrivial synthetic observation

I heard someone got a 3 on a problem once.

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EZ588

41 posts

EZ588

#11 h Apr 24, 2025, 3:46 AM

Y by

KevinChen_Yay wrote:

@above

llddmmtt1 wrote:

nontrivial synthetic observation

probably right?

maybe identifying the cyclic quadrilateral gives one point?

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UberPiggy

55 posts

UberPiggy

#12 h May 20, 2025, 5:13 AM

Y by

Sorry for the bump. I know this is a relatively old thread but could anyone tell me what errors I made in my solution (attached)?
Maybe I should have used darker ink for the diagram

Attachments:

JMO_P5.pdf (395kb)

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LearnMath_105

155 posts

LearnMath_105

#13 h May 20, 2025, 5:39 PM

Y by

I've heard multiple people (including me) got a 6 from coord bash on this

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freefall222

5 posts

freefall222

#14 h May 20, 2025, 6:06 PM

Y by

UberPiggy wrote:

Hi,

I just received my USAJMO score distribution: 000 701 (very cursed I know)

The thing is, I solved #5 (Geometry) by using Cartesian coordinates and tried to show a lot of detail in my calculations. I don't think I mislabeled the pages or anything either. I don't have the scans, but does anyone know why this might be the case? Thank you!

The distrib is hurting my eyes

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Math4Life2020

2966 posts

Math4Life2020

#15 h May 20, 2025, 6:38 PM

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elasticwealth wrote:

a 99% complete bash typically earns a zero

i've gotten a 6 on TSTST and a 6 on RMM with slighly incorrect bashes

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aidensharp

363 posts

aidensharp

#16 h May 21, 2025, 8:33 PM • 1 Y

Y by Pengu14

UberPiggy wrote:

Sorry for the bump. I know this is a relatively old thread but could anyone tell me what errors I made in my solution (attached)?
Maybe I should have used darker ink for the diagram

I kinda suck at math but on page 4, if OC has slope $\frac{a-1}{b}$ and BC has slope $\frac{b}{a-1}$ , that doesn't imply they are perpendicular. It would have to be BC has slope $\frac{b}{1-a}$ ?

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UberPiggy

55 posts

UberPiggy

#17 h May 21, 2025, 11:31 PM

Y by

I just saw that, thanks for the catch. I don't think I made this error anywhere else though, is this a big enough mistake to justify a 0?

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