Ikura

On January 18 I published some puzzles with the digits 1-9, each one to be used exactly once. In a publication by Denksport, the largest Dutch puzzle publisher, I found Ikura. Ikura in Japanese is the name of salmon caviar, and the first 20-50 hits in the duckduckgo search engine mostly referred to sushi and crosswords, so I guess Denksport made up this name themselves.

Below you find some examples of puzzles of this kind.

1) Ikura nr 1^**/*****

2) Ikura nr 2^**/*****

3) Ikura nr 3^**/*****

You can check your solution here

The digits 1-9 are each used exactly once.  The numbers ate the right and bottom are the sum of the digits in the 3×3 square.

New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.

Dice puzzles old and new

Last month we had a look at the most famous of dice puzzles, the Polar bear puzzle. One of the beauties of dice puzzles is that, like playing cards, they are around in many bars.

I found an original dice puzzle in issue 70 of the long defunct British magazine Games & Puzzles, dated May/June 1978.

1) G&P issue 70^***/*****



I’m not sure which one is older, the Polar Bears dice puzzle or the one in G&P.

You can check your solution here

2) 4 rolls of 4 dice^***/*****



I’m not sure which one is older, the Polar Bears dice puzzle or the one in G&P.

You can check your solution here

Bongard problem S3

Which rule satisfies the 6 figures on the left but is obeyed by none of the 6 figures on the right?
1)Bongard problem S3^***/*****

In 1967 the Russian scientist M.M. Bongard published a book containing 100 problems. Each problem consists of 12 small boxes: six boxes on the left and six on the right. Each of the six boxes on the left conform to a certain rule. Each and every box on the right contradicts this rule. Your task, of course, is to figure out the rule.

You can check your solution here

You can find more Bongard problems here on this site and at Harry Foundalis’ site.

New puzzles are published at least twice a month on Fridays. Solutions are published after one or more weeks. You are welcome to remark on the difficulty level of the puzzles, discuss alternate solutions, and so on. Puzzles are rated on a scale of 1 to 5 stars.