I don't know if this is know or not but I just found out a varation on the IBJ. Instead of putting 2 bombs at every spot like normally you can also put a bomb shortly after the next one so instead of
B
2B
2B
you get
B
B
B
B
B
I tend to find it a little more easy
B
2B
2B
you get
B
B
B
B
B
I tend to find it a little more easy
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