Tutorial #68 Strong and Weak links and Open Ended Chains, which enable you to remove small numbers.

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Sudoku Guy
Published at : 19 Jan 2021
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Strong and weak links play an important part in eliminating small numbers. The key is to understand the difference between the 2 types of links and understand the sequence of links in a chain. The number of links in a chain can be any odd number e.g. 3,5,7,9,etc and all links in a chain must start and end with a stong link.
OOOOPS!!! sorry I made a mistake at the 3 min point. The weak link in block 6 was meant to be a blue line..not a red lne.
techniques and procedures used:
Strong Link , Weak link,,. Definitions., Open ended chains using alternating strong and weak links .If one end is true (correct) the other end is false (incorrect) We don't know which end will be true or false. This is not important as long as you understand that one end will be true and the other end will be false.

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