Teaser 2504

[Cactus]

Sunday Times Teaser 2504 by Bob Walker
===============================

In the diagram below there are 18 black cards (B) organised in
chessboard fashion with white areas between them. Some black cards
have a mark on their back, the clues below (all in white areas)
indicating how many marks there are in total on adjacent black cards.
How many black cards have a mark on their back?

| B | | B | | B |<>0|
| 1 | B |>=3| B |<=1| B |
| B | | B |<>1| B | |
| | B | | B |>=2| B |
| B |>=3| B |<>3| B | |
|<>2| B | | B | 1 | B |

(requires fixed width font, <> is 'not equal').

Cactus

[Guy]

Morning All

After last week's fun, I think this is relatively straightforward,
just start at the top right corner and work your way across and down
the grid. On my version you have 10 crosses.

Guy

|0|w|X|w|X|w|
|w|X|w|0|w|0|
|0|w|X|w|0|w|
|w|X|w|X|w|X|
|X|w|X|w|0|w|
|w|0|w|0|w|X|

[Teasemaster]

I also get 10
0 W X W X W
W X W 0 W 0
0 W X W 0 W
W X W X W X
0 W X W 0 W
W X W 0 W X

OR

0 W X W 0 W
W X W 0 W X
0 W X W 0 W
W X W X W X
0 W X W 0 W
W X W 0 W X

... and possibly others

TM