(8 tricks) then there are 9 tricks left for E/W, so they can make 3
. If N/S can make lets say 4
(10 tricks), then there are only 7 tricks left for E/W so 5
would go down 4, not a good sacrifice at any vulnerability.Law of Total Tricks
The total number of tricks available in a bridge hand is equal to the sum of the number of trumps held by each side.
Suppose, for example that N/S are bidding spades with an 8 card trump fit, and E/W hearts, with a 9 card trump fit. The total tricks available will be 8+9=17. So, if N/S can make only 2 (8 tricks) then there are 9 tricks left for E/W, so they can make 3 . If N/S can make lets say 4 (10 tricks), then there are only 7 tricks left for E/W so 5 would go down 4, not a good sacrifice at any vulnerability.
"The Law" starts losing accuracy when one side has a preponderance of high cards, or when a flat 4-3-3-3 hand is present. Generally speaking it is a valuable tool in competitive bidding situations.
Compiled by Lorne Russell 2005