The New Sudoku Players' Forum

by **Hajime** » Thu Mar 19, 2026 12:10 pm

The Flag of Fryslȃn has 7 waterlily leaves (not hearts).

Fryslȃn is one of 12 provinces of the Netherlands.
Here a Puzzle with 2 leaves, SE=7.2

Code: Select all: . . . . . 1 3 . . . . . . 2 . 9 . . . . . . 9 . 8 4 1 . . . . 7 . . . 9 . 3 1 . . 4 2 8 . 8 . 6 . . . . . . 4 . 3 5 1 . . . . 6 . . . 3 . . . . . 5 2 7 . . . . .

by **RSW** » Sat Mar 21, 2026 6:14 am

Two steps:

1.

Code: Select all: +---------------+---------------+----------------+ | 59 4678 45789 | c468 48 1 | 3 257 27 | | 13 148 48 | c348 2 57 | 9 567 67 | | 23 26 57 | c36 9 57 | 8 4 1 | +---------------+---------------+----------------+ | 25 24 45 | c18 7 38 |bf16 136 9 | | 7 3 1 | 9 6 4 | 2 8 5 | | 8 9 6 | 12 5 23 | 147 137 347 | +---------------+---------------+----------------+ | 4 78 3 | 5 1 2689 |af6+7 2679 2678 | | 6 178 789 |cd248 3 289 | 5 1279 2478 | | 19 5 2 | 7 e48 689 | f146 1369 3468 | +---------------+---------------+----------------+

(7=6)r7c7 - (6=1)r4c7 - (1=34682)r12348c4 - (4)r8c4 = r9c5 - (4=167)r479c7 => +7r7c7

Then locked sets and singles.

2.

Code: Select all: +---------------+------------+--------------+ |c59 467 4578-9| 468 48 1 | 3 25 27 | | 13 14 48 | 348 2 57 | 9 56 67 | | 23 26 b57 | 36 9 57 | 8 4 1 | +---------------+------------+--------------+ | 25 24 45 | 18 7 38 | 16 136 9 | | 7 3 1 | 9 6 4 | 2 8 5 | | 8 9 6 | 12 5 23 | 14 7 34 | +---------------+------------+--------------+ | 4 8 3 | 5 1 269 | 7 269 26 | | 6 17 a79 | 248 3 289 | 5 129 48 | | 1-9 5 2 | 7 48 689 | 146 1369 348 | +---------------+------------+--------------+

(9=7)r8c3 - (7=5)r3c3 - (5=9)r1c1 => -9r9c1 -9r1c3; ste

by **jco** » Sat Mar 21, 2026 12:01 pm

My solution path is very similar to RSW's [move 1 with some ahs instead of als].

by **Hajime** » Wed Apr 01, 2026 2:07 pm

Nice solutions.
This one is a pearl with SE=9.1/9.1/2.6 ; this highest I could find.
No Forcing Chains/Nets needed according to YZF_Sudoku .

Code: Select all: . . . . . 1 4 . . . . . . 2 . 9 . . . . . . 6 . 8 1 7 . . . . 5 . . . 9 . 6 5 . . 8 2 7 . 9 . 4 . . . . . . 4 . 1 2 8 . . . . 6 . . . 3 . . . . . 8 7 5 . . . . .

by **Cenoman** » Fri Apr 03, 2026 6:59 pm

Four AIC's (for second puzzle):

Code: Select all: +------------------------+-----------------------+-------------------------+ |Ca357-8 C379 B3689 | 3789 C79 1 | 4 b2356 b2356 | | 13578 1347 Bc368 | 3478 2 3457 | 9 c356 c356 | | D235 2349 B239 | 349 6 3459 | 8 1 7 | +------------------------+-----------------------+-------------------------+ | 1278-3 1237 A238 | 13467 5 2347 | 136 346 9 | | 1-3 6 5 | 1349 149 8 | 2 7 134 | | 9 1237 4 | 1367 17 237 | 1356 3568 13568 | +------------------------+-----------------------+-------------------------+ | 4 359 1 | 2 8 679 | 3567 3569 356 | | 6 259 29 | 1479 3 479 | 157 24589 12458 | | D23 8 7 | 5 149 469 | 136 23469 12346 | +------------------------+-----------------------+-------------------------+

1. (5)r1c1 = r1c89 - (5=368)r2c389 => -8 r1c1
2. (3)r4c3 = r123c3 - (3=795)r1c125 - (5=23)r39c1 => -3 r45c1; 3 placements

Code: Select all: +----------------------+-----------------------+-------------------------+ | 357 379 3689 | 3789 d79 1 | 4 2356 2356 | | 3578 1 368 | 3478 2 3457 | 9 356 356 | | e235 4 239 | e39 6 e359 | 8 1 7 | +----------------------+-----------------------+-------------------------+ | 278 237 238 | 13467 5 2347 | 136 346 9 | | 1 6 5 | 349 49 8 | 2 7 34 | | 9 237 4 | 1367 d17 237 | 1356 3568 c13568 | +----------------------+-----------------------+-------------------------+ | 4 359 1 | 2 8 679 | 3567 3569 356 | | 6 259 29 | 1479 3 479 | 157 b24589 b12458 | | 3-2 8 7 | 5 149 469 | 136 a23469 b12346 | +----------------------+-----------------------+-------------------------+

3. (2)r9c8 = (248-1)b9p569 = r6c9 - (1=79)r16c5 - (9=352)r3c146 => -2 r9c1; 1 placement
4. (1)r4c7 = r4c4 - r6c5 = r9c5 => -1 r9c7; lclste

Frisian Flag SE=7.2