i took a lot of my time on the cross. the big thing that help me was knowing color scheme relationship, blue/green orange/red green and the adj. edges going clockwise and counterclockwise.
what happened to me the most was that i would have 2 opposite colors correct and 2 opposite color flipped. i could do the cross fast, but i would make the mistake of putting them in the wrong relation. i would get the colors opposite of eachother every time though.
for a while, i didnt care about making cross wrong because a short trick to fix the cross (M2 U2 M2 with bad edge on the front and back). Also while performing this quick fix, you are able to look ahead fairly well for first f2l pair because it only hides the front and back edge on the top when you do the M2. this give you adequate time to look at the front right slot and front left slot for edge and corners. if you are good, pretty much the whole cube can be inspected for corner and edges.
from doing this "fix" many times, i would reccomend doing R2' r2 U2 R2' r2 instead of M2 U2 M2, just because i personally can get better views while doing it like this.
the last trick i would use is try playing around with double layer turns to help place cross edges, sometimes you can find nifty tricks.
what happened to me the most was that i would have 2 opposite colors correct and 2 opposite color flipped. i could do the cross fast, but i would make the mistake of putting them in the wrong relation. i would get the colors opposite of eachother every time though.
for a while, i didnt care about making cross wrong because a short trick to fix the cross (M2 U2 M2 with bad edge on the front and back). Also while performing this quick fix, you are able to look ahead fairly well for first f2l pair because it only hides the front and back edge on the top when you do the M2. this give you adequate time to look at the front right slot and front left slot for edge and corners. if you are good, pretty much the whole cube can be inspected for corner and edges.
from doing this "fix" many times, i would reccomend doing R2' r2 U2 R2' r2 instead of M2 U2 M2, just because i personally can get better views while doing it like this.
the last trick i would use is try playing around with double layer turns to help place cross edges, sometimes you can find nifty tricks.
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