Johnith;168819 wroteI fold here 100%!
is the correct answer.
i did a bit of digging and found a nice calculator. hopefully it applies to double or nothing sngs. (i think so.)
not sure if the table below will come out legible but basically if CO pushes, (and he should be pushing with almost EVERY hand) i cannot call
profitably with ANY hand. (by some strange coincidence i made the right decision.) SB should only call with AA and BB should only call with 99+.
CO99.5%, AA 22+ 3x+ BU0.0%, SB0.5%, AA BB0.5%, AA SB0.5%, AA BB0.5%, AA BB2.7%, 99+
amazingly, BB did have 99 and re-pushed. it was an easy call for CO, who turned over 77. of course i instantly regretted my fold, especially when a Q turned. then the river gave CO a 7-high 4-card flush and i felt better.
EDIT: ok, the table didn't come out. MY BAD