John, I gather that he numbered the list. Very modern of him.
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| Segoe's tesuji classification http://www.lifein19x19.com/viewtopic.php?f=15&t=4199 |
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| Author: | John Fairbairn [ Sat Jul 09, 2011 5:36 am ] |
| Post subject: | Segoe's tesuji classification |
Segoe Kensaku, possibly the best player in the world at one time, was known for his propensity in any position to look first for the tesuji. As a senior administrator for the Nihon Ki-in as well, he was clearly a well organised type and was apparently not above making lists. Here is a list he made of the types of tesujis required in life and death. It is not clear why he subdivided item 24. Problems can also be grouped into "kill" and "live" types and sub-types with the items above put into each of the appropriate sets. That portion is omitted here but will be on the next GoGoD CD. I don't suppose the list was meant to be definitive or complete, and I'm not sure if it was ever meant to underlie his famous tesuji dictionary. The classification there is the boring "tsuke" "hane" "kosumi" type, but I suspect that may be due to an editor. The dictionary, however, does give examples. You can decide for yourself whether examples are more important than lists, or whetever, but it is at least interesting to see other minds at work, and it may be worth collecting examples of Segoe's categories here. Segoe's classification of life & death tesuji 1. Eye-stealing tesuji 2. Throw-in and snapback tesuji 3. 2-1 point tesuji 4. The enemy's best point is my own best point 5. Shortage of liberty tesuji 6. Centre of symmetry 7. Tesuji active on two sides 8. Eye-making tesuji 9. Tesuji to broaden eye-space 10. Tesuji to reduce eye space from the outside 11. Accurate order of moves 12. Under the stones tesuji 13. Kosumi on the first line 14. Jump on the first line 15. First-line placement tesuji 16. First-line sagari tesuji 17. First-line knight's move tesuji 18. First-line narabi tesuji 19. 1-1 point tesuji 20. Tesuji using the special properties of the corner 21. Tesuji of adding one stone to make two 22. Tesuji using sacrifice stones 23. Tesuji exploiting opponent's weak points (e.g. cut) 24A. Clamp tesuji 24B. Butting attachment (tsuppari) 24C. Cut across the knight's move 24D. Wedge-in tesuji 25. Using outside surrounding stones 26. Tesuji exploiting an existing hane 27. Tesuji using indirect attack 28. Tesuji that go against common sense |
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| Author: | RobertJasiek [ Sat Jul 09, 2011 6:28 am ] |
| Post subject: | Re: Segoe's tesuji classification |
Let me make a bit of actual classification of the random selective list. First line 3. 2-1 point tesuji 13. Kosumi on the first line 14. Jump on the first line 15. First-line placement tesuji 16. First-line sagari tesuji 17. First-line knight's move tesuji 18. First-line narabi tesuji 19. 1-1 point tesuji 20. Tesuji using the special properties of the corner Eye shape 1. Eye-stealing tesuji 2. Throw-in and snapback tesuji 8. Eye-making tesuji 9. Tesuji to broaden eye-space 10. Tesuji to reduce eye space from the outside Shape 6. Centre of symmetry 24A. Clamp tesuji 24B. Butting attachment (tsuppari) 24C. Cut across the knight's move 24D. Wedge-in tesuji 26. Tesuji exploiting an existing hane Sacrifice 21. Tesuji of adding one stone to make two 22. Tesuji using sacrifice stones 12. Under the stones tesuji Misc 4. The enemy's best point is my own best point 5. Shortage of liberty tesuji 7. Tesuji active on two sides 11. Accurate order of moves 23. Tesuji exploiting opponent's weak points (e.g. cut) 25. Using outside surrounding stones 27. Tesuji using indirect attack 28. Tesuji that go against common sense This shows that it is not a systematic classification but some topics are much more emphasised than others. |
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| Author: | Bill Spight [ Sat Jul 09, 2011 7:35 am ] |
| Post subject: | Re: Segoe's tesuji classification |
John, I gather that he numbered the list. Very modern of him.
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| Author: | jts [ Sat Jul 09, 2011 8:07 am ] |
| Post subject: | Re: Segoe's tesuji classification |
I couldn't help but be reminded of this classification system, which no doubt would work well for tesuji: |
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| Author: | karaklis [ Sat Jul 09, 2011 11:08 am ] |
| Post subject: | Re: Segoe's tesuji classification |
I wonder why throw-in and snapback are mentioned in one group. To me these two seem to be two different techniques. |
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| Author: | RobertJasiek [ Sat Jul 09, 2011 4:58 pm ] |
| Post subject: | Re: Segoe's tesuji classification |
If both are meant to kill, then both throw-in and snapback are capturable-1 plays currently played to change unsettled opposing stones to dead. So it is possible to perceive them as one class of tesuji. |
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