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The swordfish is difficult to spot. It requires you to put all possible numbers in empty cells, which is a lot of work.

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This puzzle can be solved without the swordfish. Look at this video as a demonstration of the swordfish. It is possible to solve this puzzle without using the swordfish technique. I used this puzzle to demonstrate how to spot a swordfish pattern.
It has been pointed out that ta 2.30 I could have eliiminated the 6 at the top due to a 6 being below.. Thanks to "reconllc" for letting me know. I should have explained the blocks 1 2 and 3 and left out the rest of the numbers below. Also you will probably see that I put 2 ones in block 8. My mistake. It doesn't change the secenario however. the ones could have easily be left out of the scenario.

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