Yuri,

>This thread invoked my interest to the issue. Take a look on Download # 30434. If you do not mind, it will contain your code, otherwise I will add something on my own. Let me know.
>If you have ideas about how to code the puzzle with single solution and/or define the difficulty level, I would greatly appreciate if you share it with me.

I wrote this thing only one day or so after I ever heard about sodoku. I don't think it is very solid as there is one big flaw in it that it does not create a truly randomized puzzle.

As far as for the difficulty level, I guess it has to do with the number of numbers you show on the puzzle combined with which numbers.

I wrote a VFP program to solve a puzzle a few months ago, That program could be enhanced to determine the difficulty level.

But anyways, I'm afraid I can't help you right now: I'm too busy with other things..

Walter,


>
>>How about this one.
>>
>>It will create a new sudoko (never heard about it until today though) map each time.
>>
>>

>>DIMENSION aStrings[9], aResult[9], aRandomize[6,3]
>>CLEAR
>>
>>FOR nT = 0 TO 17
>>	aRandomize[nT+1] = VAL(SUBSTR(GETWORDNUM("123 132 231 213 312 321", INT(nT/3)+1),(nT%3)+1,1))
>>ENDFOR
>>
>>* Generate a random number to use as a base
>>cString = "123456789"
>>FOR nT = 1 TO 9
>>	nPos = INT(RAND() * 9)+1
>>	cString = IIF(nPos>1, SUBSTR(cString, nPos,1)+LEFT(cString, nPos-1)+SUBSTR(cString,nPos+1), cString)
>>	cString =  SUBSTR(cString,2)+LEFT(cString,1)
>>ENDFOR
>>
>>* Make a basic Soduko map
>>nT = 1
>>FOR nY = 1 TO 3
>>	FOR nX = 1 TO 3
>>		aStrings[nT] = cString
>>		cString = SUBSTR(cString,4)+LEFT(cString,3)
>>		nT = nT + 1
>>	ENDFOR
>>	cString =  SUBSTR(cString,2)+LEFT(cString,1)
>>ENDFOR
>>
>>* Move rows arround, to randomize
>>nT = 1
>>nRand2 = INT(RAND()*6)+1
>>FOR nY = 1 TO 3
>>	nRand = INT(RAND()*6)+1
>>	FOR nY2 = 1 TO 3
>>		aResult[nT] = aStrings[(aRandomize[nRand2, nY]-1)*3+aRandomize[nRand, nY2]]
>>		nT = nT + 1
>>	ENDFOR
>>ENDFOR
>>
>>* Move columns arround, to randomize
>>nT = 1
>>nRand2 = INT(RAND()*6)+1
>>FOR nX = 1 TO 3
>>	nRand = INT(RAND()*6)+1
>>	FOR nX2 = 1 TO 3
>>		FOR nX3 = 1 TO 9
>>			aStrings[nX3] = STUFF(aStrings[nx3], (aRandomize[nRand2, nX]-1)*3+aRandomize[nRand, nX2], 1, ;
>>				SUBSTR(aResult[nX3], nT,1))
>>		ENDFOR
>>		nT = nT + 1
>>	ENDFOR
>>ENDFOR
>>
>>* Display puzzle
>>
>>FOR nT = 1 TO 9
>>	? " "+aStrings[nT]
>>ENDFOR