A General Logic for Sudoku ALS Backbone for 3D Kraken Like Fish |
Points. ALS and similar structures are often found
embedded in set logic
eliminations. ALS Backbone for 3D Kraken Like Fish This elimination was the first difficult move in
solving Top1465 #77. The structure
is made mostly from two ALS, the first formed by 3 cell sets in box 1, and
the second by 3 column sets in column 5 (columns 3 and 9 overlay each other
in the 2D diagram). It has no triplets. The logic is rank 1
and the elimination of 6r2c6 is caused by the overlap of row set r26
and cell set c66, highlighted red and green respectively. |