# Three chess puzzles

Set the six figures (pawn, queen, rook, bishop, king, knight) on a chessboard in such a way that every marked cell is threatened that number of times. For example, if the cell is marked “2”, it can only be threatened twice and if it’s marked “0”, it should not be threatened at all.

Simon shows how to set the first couple of figures correctly on every pictures below. Can you finish every puzzle?

# A quiz full of fun tricks

Simon got these from the Scam School channel.

I first only got a strip paper with a sequence of green sticks written on it, separated by comas. Simon did tell me those were pieces of numbers, the way they appear on a calculator screen, and that I was supposed to comolete the sequence. I tried to give this one a shot. To stop the waiting that began to seem eternal he eventually gave me the answer: the green sticks were everything BUT the numbers! Below you see the competed version:

Here, too, one is supposed to continue the sequence of numbers written in a column. You see the pattern?

Here too, come up with the next character:

See the pattern now?

The next one is hilarious! Rearrange the letters below to write ONE WORD:

And in the last puzzle, the nine words used to have something in common, but now it’s just eight of them.

If you get stuck with any of these, leave a plea for help in the comments!

# More puzzles

Move three matches and turn the grid below into three identical squares. Another puzzle with the same grid: place six coins in the grid without creating a three in a row. (Answers below).

# River Crossings Puzzle

This is a Japanese version of the famous River Crossings Puzzle that Simon learned from the Scam School channel (yes, our little programming and math nerd actually watches Scam School, a channel dedicated to social engineering at the bar and in the street!)

The answer, a sequence of 17 moves:

Simon showing the classic River Crossings puzzle to friends

Math graphs for solving the simple and the more advanced River Crossings puzzles using minimum vertex covers and Alcuin Numbers (learned via Numberphile):