1) Get a SOM of the target and put the value "Net Defensive Points at Home" into the tool.
2) Get another SOM of the target and put the value "Net Defensive Points at Home" into the tool. Click "Compute".
3) Repeat 2) if it gives you more than one possible number.
4) Attack the target, sending more offense points than "Total Defense points".


Things not to do:
1) Do NOT put in a rounded value of "Net Defensive Points at Home". It is very important you use the exact value the SOM shows. So dont put in 60000 if SOM shows 60001!
2) Do NOT wait too long between getting the SOMs you use. It is important that the targets defense doesn't change in between SOMs! So dont take som1 before hourchange, and som2 after!
3) Do NOT screw up and blame the tool. If you bounce, find out what YOU did wrong, and dont do it next time. :)

SOM Calculator