correction of conclusion, wiki sample is simply solved without any manual split yet
TODO: need to get a hard one to develop split using stack features!


cd /home/mark/zzz/sudoku1; JAVA_HOME=/usr/local/java/jdk1.7.0_51 /home/mark/netbeans-7.4/java/maven/bin/mvn "-Dexec.args=-classpath %classpath com.livehereandnow.sudoku.app.App" -Dexec.executable=/usr/local/java/jdk1.7.0_51/bin/java -Prelease-profile org.codehaus.mojo:exec-maven-plugin:1.2.1:exec
Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
Scanning for projects...

Some problems were encountered while building the effective model for com.livehereandnow.mark1.sudoku:sudoku1:jar:1.0
'build.plugins.plugin.version' for org.apache.maven.plugins:maven-javadoc-plugin is missing.
'build.plugins.plugin.version' for org.apache.maven.plugins:maven-deploy-plugin is missing.
'build.plugins.plugin.version' for org.apache.maven.plugins:maven-source-plugin is missing.

It is highly recommended to fix these problems because they threaten the stability of your build.

For this reason, future Maven versions might no longer support building such malformed projects.

                                                                        
------------------------------------------------------------------------
Building sudoku1 1.0
------------------------------------------------------------------------

--- exec-maven-plugin:1.2.1:exec (default-cli) @ sudoku1 ---
**************
*   Step 1   *
**************
--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{248}
row#2:{},{247},{247},{},{},{},{3478},{234},{2478}
row#3:{12},{},{},{23},{34},{24},{13457},{},{247}
row#4:{},{125},{1259},{579},{},{147},{4579},{2459},{}
row#5:{},{25},{2569},{},{5},{},{579},{259},{}
row#6:{},{15},{1359},{59},{},{14},{4589},{459},{}
row#7:{139},{},{134579},{357},{35},{7},{},{},{4}
row#8:{23},{278},{237},{},{},{},{36},{3},{}
row#9:{123},{1245},{12345},{2356},{},{26},{1346},{},{}
possible value count:153

single possible value: 
  cell[41]=5 
  cell[60]=7 
  cell[63]=4 
  cell[71]=3 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8*5 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . .*7 2 8*4
 . . . 4 1 9 .*3 5
 . . . . 8 . . 7 9
known cells count: 34
note: * is newly added
  cell[41]=5 is newly added
  cell[60]=7 is newly added
  cell[63]=4 is newly added
  cell[71]=3 is newly added

**************
*   Step 2   *
**************
--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{28}
row#2:{},{247},{247},{},{},{},{3478},{24},{278}
row#3:{12},{},{},{23},{34},{24},{13457},{},{27}
row#4:{},{125},{1259},{79},{},{14},{4579},{2459},{}
row#5:{},{2},{269},{},{},{},{79},{29},{}
row#6:{},{15},{1359},{9},{},{14},{4589},{459},{}
row#7:{139},{},{1359},{35},{3},{},{},{},{}
row#8:{2},{278},{27},{},{},{},{6},{},{}
row#9:{123},{1245},{12345},{2356},{},{26},{16},{},{}
possible value count:129

single possible value: 
  cell[38]=2 
  cell[49]=9 
  cell[59]=3 
  cell[64]=2 
  cell[70]=6 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4*2 . 8 5 3 . . 1
 7 . .*9 2 . . . 6
 . 6 . .*3 7 2 8 4
*2 . . 4 1 9*6 3 5
 . . . . 8 . . 7 9
known cells count: 39
note: * is newly added
  cell[38]=2 is newly added
  cell[49]=9 is newly added
  cell[59]=3 is newly added
  cell[64]=2 is newly added
  cell[70]=6 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{124},{26},{},{2468},{1489},{1249},{28}
row#2:{},{47},{247},{},{},{},{3478},{24},{278}
row#3:{1},{},{},{23},{4},{24},{13457},{},{27}
row#4:{},{15},{159},{7},{},{14},{4579},{2459},{}
row#5:{},{},{69},{},{},{},{79},{9},{}
row#6:{},{15},{135},{},{},{14},{458},{45},{}
row#7:{19},{},{159},{5},{},{},{},{},{}
row#8:{},{78},{7},{},{},{},{},{},{}
row#9:{13},{145},{1345},{256},{},{26},{1},{},{}
possible value count:103

single possible value: 
  cell[19]=1 
  cell[23]=4 
  cell[31]=7 
  cell[44]=9 
  cell[58]=5 
  cell[66]=7 
  cell[79]=1 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
*1 9 8 .*4 . . 6 .
 8 . .*7 6 . . . 3
 4 2 . 8 5 3 .*9 1
 7 . . 9 2 . . . 6
 . 6 .*5 3 7 2 8 4
 2 .*7 4 1 9 6 3 5
 . . . . 8 .*1 7 9
known cells count: 46
note: * is newly added
  cell[19]=1 is newly added
  cell[23]=4 is newly added
  cell[31]=7 is newly added
  cell[44]=9 is newly added
  cell[58]=5 is newly added
  cell[66]=7 is newly added
  cell[79]=1 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{26},{},{268},{489},{124},{28}
row#2:{},{47},{24},{},{},{},{3478},{24},{278}
row#3:{},{},{},{23},{},{2},{357},{},{27}
row#4:{},{15},{159},{},{},{14},{45},{245},{}
row#5:{},{},{6},{},{},{},{7},{},{}
row#6:{},{15},{135},{},{},{14},{458},{45},{}
row#7:{9},{},{19},{},{},{},{},{},{}
row#8:{},{8},{},{},{},{},{},{},{}
row#9:{3},{45},{345},{26},{},{26},{},{},{}
possible value count:76

single possible value: 
  cell[24]=2 
  cell[39]=6 
  cell[43]=7 
  cell[55]=9 
  cell[65]=8 
  cell[73]=3 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 1 9 8 . 4*2 . 6 .
 8 . . 7 6 . . . 3
 4 2*6 8 5 3*7 9 1
 7 . . 9 2 . . . 6
*9 6 . 5 3 7 2 8 4
 2*8 7 4 1 9 6 3 5
*3 . . . 8 . 1 7 9
known cells count: 52
note: * is newly added
  cell[24]=2 is newly added
  cell[39]=6 is newly added
  cell[43]=7 is newly added
  cell[55]=9 is newly added
  cell[65]=8 is newly added
  cell[73]=3 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{6},{},{68},{489},{124},{28}
row#2:{},{47},{24},{},{},{},{348},{24},{278}
row#3:{},{},{},{3},{},{},{35},{},{7}
row#4:{},{15},{159},{},{},{14},{45},{245},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{15},{135},{},{},{14},{458},{45},{}
row#7:{},{},{1},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{45},{45},{26},{},{6},{},{},{}
possible value count:61

single possible value: 
  cell[4]=6 
  cell[22]=3 
  cell[27]=7 
  cell[57]=1 
  cell[78]=6 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 .*6 7 . . . .
 6 . . 1 9 5 . . .
 1 9 8*3 4 2 . 6*7
 8 . . 7 6 . . . 3
 4 2 6 8 5 3 7 9 1
 7 . . 9 2 . . . 6
 9 6*1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 . . . 8*6 1 7 9
known cells count: 57
note: * is newly added
  cell[4]=6 is newly added
  cell[22]=3 is newly added
  cell[27]=7 is newly added
  cell[57]=1 is newly added
  cell[78]=6 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{},{},{8},{489},{124},{28}
row#2:{},{47},{24},{},{},{},{348},{24},{28}
row#3:{},{},{},{},{},{},{5},{},{}
row#4:{},{15},{59},{},{},{14},{45},{245},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{15},{35},{},{},{14},{458},{45},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{45},{45},{2},{},{},{},{},{}
possible value count:50

single possible value: 
  cell[6]=8 
  cell[25]=5 
  cell[76]=2 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . 6 7*8 . . .
 6 . . 1 9 5 . . .
 1 9 8 3 4 2*5 6 7
 8 . . 7 6 . . . 3
 4 2 6 8 5 3 7 9 1
 7 . . 9 2 . . . 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 . .*2 8 6 1 7 9
known cells count: 60
note: * is newly added
  cell[6]=8 is newly added
  cell[25]=5 is newly added
  cell[76]=2 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{24},{},{},{},{49},{124},{2}
row#2:{},{47},{24},{},{},{},{348},{24},{28}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{15},{59},{},{},{14},{4},{245},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{15},{35},{},{},{14},{48},{45},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{45},{45},{},{},{},{},{},{}
possible value count:43

single possible value: 
  cell[9]=2 
  cell[34]=4 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 . 6 7 8 . .*2
 6 . . 1 9 5 . . .
 1 9 8 3 4 2 5 6 7
 8 . . 7 6 .*4 . 3
 4 2 6 8 5 3 7 9 1
 7 . . 9 2 . . . 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 . . 2 8 6 1 7 9
known cells count: 62
note: * is newly added
  cell[9]=2 is newly added
  cell[34]=4 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{4},{},{},{},{9},{14},{}
row#2:{},{47},{24},{},{},{},{38},{4},{8}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{15},{59},{},{},{1},{},{25},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{15},{35},{},{},{14},{8},{5},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{45},{45},{},{},{},{},{},{}
possible value count:31

single possible value: 
  cell[3]=4 
  cell[7]=9 
  cell[17]=4 
  cell[18]=8 
  cell[33]=1 
  cell[52]=8 
  cell[53]=5 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3*4 6 7 8*9 . 2
 6 . . 1 9 5 .*4*8
 1 9 8 3 4 2 5 6 7
 8 . . 7 6*1 4 . 3
 4 2 6 8 5 3 7 9 1
 7 . . 9 2 .*8*5 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 . . 2 8 6 1 7 9
known cells count: 69
note: * is newly added
  cell[3]=4 is newly added
  cell[7]=9 is newly added
  cell[17]=4 is newly added
  cell[18]=8 is newly added
  cell[33]=1 is newly added
  cell[52]=8 is newly added
  cell[53]=5 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{},{},{},{},{},{1},{}
row#2:{},{7},{2},{},{},{},{3},{},{}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{5},{59},{},{},{},{},{2},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{1},{3},{},{},{4},{},{},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{45},{5},{},{},{},{},{},{}
possible value count:14

single possible value: 
  cell[8]=1 
  cell[11]=7 
  cell[12]=2 
  cell[16]=3 
  cell[29]=5 
  cell[35]=2 
  cell[47]=1 
  cell[48]=3 
  cell[51]=4 
  cell[75]=5 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 4 6 7 8 9*1 2
 6*7*2 1 9 5*3 4 8
 1 9 8 3 4 2 5 6 7
 8*5 . 7 6 1 4*2 3
 4 2 6 8 5 3 7 9 1
 7*1*3 9 2*4 8 5 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 .*5 2 8 6 1 7 9
known cells count: 79
note: * is newly added
  cell[8]=1 is newly added
  cell[11]=7 is newly added
  cell[12]=2 is newly added
  cell[16]=3 is newly added
  cell[29]=5 is newly added
  cell[35]=2 is newly added
  cell[47]=1 is newly added
  cell[48]=3 is newly added
  cell[51]=4 is newly added
  cell[75]=5 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{},{},{},{},{},{},{}
row#2:{},{},{},{},{},{},{},{},{}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{},{9},{},{},{},{},{},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{},{},{},{},{},{},{},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{4},{},{},{},{},{},{},{}
possible value count:2

single possible value: 
  cell[30]=9 
  cell[74]=4 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 4 6 7 8 9 1 2
 6 7 2 1 9 5 3 4 8
 1 9 8 3 4 2 5 6 7
 8 5*9 7 6 1 4 2 3
 4 2 6 8 5 3 7 9 1
 7 1 3 9 2 4 8 5 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3*4 5 2 8 6 1 7 9
known cells count: 81
note: * is newly added
  cell[30]=9 is newly added
  cell[74]=4 is newly added

--- Sudoku 9x9 possible --- (start)
row#1:{},{},{},{},{},{},{},{},{}
row#2:{},{},{},{},{},{},{},{},{}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{},{},{},{},{},{},{},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{},{},{},{},{},{},{},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{},{},{},{},{},{},{},{}
possible value count:0

single possible value: 
--- Sudoku 9x9 possible --- (end)

 --- Sudoku 9x9 --- 
 5 3 4 6 7 8 9 1 2
 6 7 2 1 9 5 3 4 8
 1 9 8 3 4 2 5 6 7
 8 5 9 7 6 1 4 2 3
 4 2 6 8 5 3 7 9 1
 7 1 3 9 2 4 8 5 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 4 5 2 8 6 1 7 9
known cells count: 81
note: * is newly added

======== Solver.show ======== (start)
**************
*  Question  *
**************
question is 530070000_600195000_098000060_800060003_400803001_700020006_060000280_000419005_000080079
 --- Sudoku 9x9 ---
 5 3 . . 7 . . . .
 6 . . 1 9 5 . . .
 . 9 8 . . . . 6 .
 8 . . . 6 . . . 3
 4 . . 8 . 3 . . 1
 7 . . . 2 . . . 6
 . 6 . . . . 2 8 .
 . . . 4 1 9 . . 5
 . . . . 8 . . 7 9
known cells count: 30

**************
*   Answer   *
**************
 --- Sudoku 9x9 ---
 5 3 4 6 7 8 9 1 2
 6 7 2 1 9 5 3 4 8
 1 9 8 3 4 2 5 6 7
 8 5 9 7 6 1 4 2 3
 4 2 6 8 5 3 7 9 1
 7 1 3 9 2 4 8 5 6
 9 6 1 5 3 7 2 8 4
 2 8 7 4 1 9 6 3 5
 3 4 5 2 8 6 1 7 9
known cells count: 81

**************
*  Possible  *
**************
--- Sudoku 9x9 possible --- (start)
row#1:{},{},{},{},{},{},{},{},{}
row#2:{},{},{},{},{},{},{},{},{}
row#3:{},{},{},{},{},{},{},{},{}
row#4:{},{},{},{},{},{},{},{},{}
row#5:{},{},{},{},{},{},{},{},{}
row#6:{},{},{},{},{},{},{},{},{}
row#7:{},{},{},{},{},{},{},{},{}
row#8:{},{},{},{},{},{},{},{},{}
row#9:{},{},{},{},{},{},{},{},{}
possible values count:0
          cells count:0
--- Sudoku 9x9 possible --- (end)

**************
*   Status   *
**************
still good
======== Solver.show ======== (end)
########### no split yet ##############This Sudoku has been solved successfully.
------------------------------------------------------------------------
BUILD SUCCESS
------------------------------------------------------------------------
Total time: 2.471s
Finished at: Sat Feb 22 19:05:58 CST 2014
Final Memory: 10M/150M
------------------------------------------------------------------------