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DB Saturday Puzzle (April 1)

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keith

Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

Posted: Sat Apr 01, 2006 2:33 pm Post subject: DB Saturday Puzzle (April 1)

Today's David Bodycombe puzzle:

Code:

Puzzle: DB040106 ******
+-------+-------+-------+
| . . . | 9 . . | . . 8 |
| . . . | 3 . . | 2 . 6 |
| 7 . 8 | 6 . . | . 5 . |
+-------+-------+-------+
| . . . | . . . | 6 . 1 |
| 3 . 9 | 1 . 8 | 5 . 4 |
| 6 . 4 | . . . | . . . |
+-------+-------+-------+
| . 8 . | . . 3 | 4 . 2 |
| 9 . 7 | . . 4 | . . . |
| 1 . . | . . 6 | . . . |
+-------+-------+-------+

I have not yet solved it completely.

Keith

someone_somewhere

Joined: 07 Aug 2005
Posts: 275
Location: Munich

Posted: Sat Apr 01, 2006 4:05 pm Post subject:

Hi,
may I suggest from Aplha star r1c7 to eliminate 3 from r9c9:

Code:

2 6 135 9 57 157 37 4 8
. . .a. . .. ... Aa . .
. . ... . .. ... aA . .
4 59 15 3 8 157 2 79 6
. .. .. . . ... . .. .
. .. .. . . ... . .. .
7 39 8 6 4 2 1 5 39
. .. . . . . . . ..
. .. . . . . . . B.
8 257 25 4 237 79 6 2379 1
. ... .. . ... .. . .... .
. ... .. . ... b. . .... .
3 27 9 1 6 8 5 27 4
. .. . . . . . .. .
. .. . . . . . .. .
6 1 4 25 2357 579 3789 23789 379
. . . .. .... ... .... ..... ...
. . . .. .... ... .... ..... ...
5 8 6 7 9 3 4 1 2
. . . . . . . . .
. . . . . . . . .
9 23 7 258 1 4 38 6 35
. .. . ... . . .. . ..
. .. . ... . . .. . ..
1 4 23 258 25 6 3789 3789 3579
. . .B ... .. . .... .... b...
. . .. ... .. . .... .... b...

and now with APLPA star r4c2 eliminate 3 from r8c7:

Code:

2 6 135 9 57 157 37 4 8
. . ... . .. ... B. . .
. . ... . .. ... .. . .
4 59 15 3 8 157 2 79 6
. .. .. . . ... . .. .
. .. .. . . ... . .. .
7 39 8 6 4 2 1 5 39
. Aa . . . . . . a.
. aA . . . . . . ..
8 257 25 4 237 79 6 2379 1
. ... .. . ... .. . .... .
. ... .. . ... .. . .... .
3 27 9 1 6 8 5 27 4
. b. . . . . . .. .
. .. . . . . . .. .
6 1 4 25 2357 579 3789 23789 379
. . . .. .... ... .... ..... ...
. . . .. .... ... .... ..... ...
5 8 6 7 9 3 4 1 2
. . . . . . . . .
. . . . . . . . .
9 23 7 258 1 4 38 6 35
. .. . ... . . b. . ..
. .B . ... . . b. . ..
1 4 23 258 25 6 3789 3789 579
. . .. ... .. . .... .... ...
. . .. ... .. . .... .... ...

now you can continue finding 2 XY-wings (for example)
and get finally to start with digit 7 from APLHA star r1c5 to
exluce it because no 3 can fit in row 5:

Code:

2 6 135 9 57 157 37 4 8
. . .b. . aA ..a Ba . .
4 59 15 3 8 157 2 79 6
. .. .. . . ..a . Bb .
7 39 8 6 4 2 1 5 39
. .. . . . . . . b.
8 257 25 4 37 9 6 237 1
. ... .. . Ba . . ..b .
3 27 9 1 6 8 5 27 4
. .. . . . . . .b .
6 1 4 25 2357 57 39 8 79
. . . .. .b.a .B b. . ..
5 8 6 7 9 3 4 1 2
. . . . . . . . .
9 23 7 25 1 4 8 6 35
. .. . .. . . . . ..
1 4 23 8 25 6 379 379 579
. . .. . .. . bB. .b. ...

and the rest is just a walk to the finish line

hope I could help u,

a.

Marty R.

Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

Posted: Sun Apr 02, 2006 3:58 pm Post subject:

A forcing chain, an infrequent (for me) X-Wing and another forcing chain got the job done.

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