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## Introduction

• Raw puzzle.
• SW Solver: Diabolical grade, overall score 225.
• Stephens' estimated times: Improver: N/A, Expert: 414 mins, Genius: 138 mins.

## Solution

Figure 1

See Figure 1 on the right.

Because I had resolved a swordfish in the book, I did so here as well before starting coloring.

Figure 2

See Figure 2 on the left. Seed pair is r1c5={15}. The {1} chain creates {4} in two positions in c8, therefore r1c5=5.

### Seed 2:

Figure 3

See Figure 3 on the right. Seed pair was r7c1={69}. With many common eliminations and confirmations, what is seen is the seed about to be confirmed as {9}, full proof of unique solution.