Odds of my Side Suit Being Ruffed 

Before you lead a card from a side suit and have not drawn all the trump cards - it is extremely helpful if you are aware of the probabilities (the odds) of your card being ruffed by the opposition

How do I Calculate the odds of one of my side suit winners being trumped

Probability Table

Sometimes you are in the position of need ing to play a side suit winner before you have drawn out all the trumps. Usually this will be either in order to reduce your trump length as holding long trumps is a disadvantage when an opponent holds a trump honor and can draw two of your trumps by playing only one of his own, or when performing a trump endplay. Anyway you may or may not wish to have this card trumped.
Cards Opposition holds vs. Rounds Played in the Suit
4th 3rd 2nd 1st
2 cards 100% 100% 100% 48%
3 cards 100% 100% 100% 22%
4 cards 100% 100% 60% 10%
5 cards 100% 100% 32% 4%
6 cards 100% 65% 17% 2%
7 cards 100% 38% 8% 1%
Table: The Odds of Being Ruffed compared to how many rounds of that suit have been played

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