Re: Effective udekimenage against resistance
General pointer as in all aikido techniques, that your hips must take place of attacker hips when you throw him.
It means for me that in ALL techniques (throws or others) the vector of your power goes through his hips. In the case of udekimange, all 3 joins of his arm have to be locked simultaneously and connected to his center. Then you use this as a leverage to put him on the top of his toes, otherwise he will simply bend his knees and no throw is possible.
Now HOW to achieve such situation with resistance (or countering) from attacker, that another story LOL You need to learn a leading, but it is really difficult. No experienced attacker will give extended arm…