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These are the things you'll need to consider on picking up easy opponent and for easy win.
2. Analyze first their stats before picking them. Look out for the 'speed' for it determines the number of attack he can do. If you have lesser 'speed' don't match him though you can still win for some luck. 'Strength' and 'Agility' has lesser effect in fight and for the reason unknown.
3. Becareful with pets for it lessen your attack in Fight. What happens your pet will do more attack than usual maneuver. Again for some luck your 'pet' can help you to win.
4. Be wise on upgrading your weapon for it will not be used at anytime especially when you have a lot of item in inventory.
5. You can also pick fight from your 'Buddies' through 'Challenge', but pick only those not more than 5levels below from you.
6. Its great to pick fight from 'Buddies' for you can fight him regularly.