X-chains and X-loops

1/17/12     X-Panel and X-Chains      X-chain toxic sets and removals with the X-panel.

1/24/12     Special X-chains                Needless searching for special X-chains                                                                          promoted in Sudoku literature.

2/06/12     Alternating X-Loops        AIC properties . Toxic set and victim of the almost                                                                        nice loop. Confirming ANL. Nice loop removals.

2/14/12     Slink X-loops                     Even sided loops are nice, but ambiguous, but                                                                        resolved by coloring. Mixing in winks.

2/21/12     Guardians                           Confirmations avoiding impossible slink loops,                                                                          removals are nice loop removals

2/28/12     Group Therapy                 Grouping and grouped X-chains. Also appy to AIC.

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