# Crossnumber winners, issue 12

Hello everyone! As the 13th Chalkdust prize crossnumber has just been released, it’s time to announce the winners of the issue 12 crossnumber competition! Before we reveal the winners, here is the solution of the crossnumber.

 6 7 2 9 9 9 7 4 1 3 2 4 4 2 2 1 9 9 9 8 0 1 5 2 1 4 1 4 9 1 1 3 7 6 2 8 4 1 2 1 5 1 4 4 7 3 3 3 9 4 5 5 4 4 4 2 4 3 3 3 9 4 1 4 8 7 3 8 3 3 3 3 3 9 4 3 9 2 1 4 1 4 1 1 2 6 4 1 0 1 4 7 9 2 1 1 9 2 2 2 0 4 4 1 9 6 1 7 5 9 1 2 4 3 9 5 4 7 2 3 3 3 3 1 5 1 3 6 3 5 1 1 3 3 1 5 6 9 3 0 7 3 5 3 3 3 4 9 5 3 6 0

The sum of the across clues was 19404.

There were 63 entries, 52 of which were correct. The randomly selected winners are:

1. Robert Kerry, who wins a £100 Maths Gear goody bag,
2. Nick Keith, who wins a Chalkdust T-shirt,
3. Sarah Gross, who wins a Chalkdust T-shirt,
4. Pamela Docherty, who wins a Chalkdust T-shirt.

Well done to Robert, Nick, Sarah, and Pamela, and thanks to everyone else who attempted the crossnumber. Hope you enjoy issue 13’s puzzle

# Prize crossnumber, Issue 13

Our original prize crossnumber is featured on pages 58 and 59 of Issue 13.

### Rules

• Each clue in this crossnumber contains two statements joined by a logical connective. If the connective is AND, then both the statements are true. If the connective is NAND, then at most one of the statements is true. If the connective is OR, then at least one of the statements is true. If the connective is NOR, then neither of the statements is true. If the connective is XOR, then exactly one of the statements is true. If the connective is XNOR, then either the statements are both true or they are both false.
• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
• To enter, enter the sum of the across entries below by 18 September 2021. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 1 November 2021.

# Cryptic crossnumber (including hints)

Cryptic clues can sometimes be a little intimidating, especially if you are not familiar with how they work. However, they all share the same basic structure, and have to follow certain rules. Most clues come in two parts: the definition and the word-play. The definition is a word or phrase which simply means the same thing as the answer to the clue, and it can be found almost invariably at the start or end of the clue. The rest of the clue forms the word-play which constructs the answer in some non-literal way. This could be as an anagram, say, or built out of other unrelated words and initialisms.

Some key things to bear in mind: the clue has to be fair, the setter cannot add in irrelevant words to trick you, and once you know the answer it should make sense how the whole clue points to that answer. What the setter is allowed to do is to write the clue so that it’s meaning at face value distracts from it’s cryptic meaning, and this includes the punctuation, so it is usually best to try to ignore these as much as possible. That said, occasionally punctuation can have a cryptic meaning too, for example “?” can indicate that a clue requires lateral thinking, or that the definition does not literally mean the same thing as the answer. Continue reading

# Prize crossnumber, Issue 12

Our original prize crossnumber is featured on pages 56 and 57 of Issue 12.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
• To enter, enter the sum of the across clues below by 14 March 2021. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 1 May 2021.

# Prize crossnumber, Issue 11

Our original prize crossnumber is featured on pages 56 and 57 of Issue 11.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
• To enter, enter the sum of the across clues below by 3 September 2020. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 1 October 2020.

# Crossnumber winners, issue 10

Hello everyone! It’s time to announce the winners of the Chalkdust prize crossnumber #10! Before we reveal the winners, here is the solution of the crossnumber.

 1 0 8 9 0 2 2 2 2 2 2 2 2 2 1 9 5 2 8 6 7 5 1 0 8 9 5 2 5 8 6 1 9 7 5 4 3 2 0 4 1 2 0 0 5 4 1 1 9 1 0 0 1 0 7 9 6 7 8 9 6 3 0 1 4 2 1 9 8 1 0 8 9 1 8 7 1 6 5 1 4 3 1 2 1 1 1 4 7 2 0 1 0 7 4 5 6 3 4 1 2 3 5 9 4 9 8 4 5 5 5 9 4 9 9 8 9 1 2 6 1 8 1 6 9 9 2 4 9 5 1 1 0 8 9 8 5 2 4 9 9 8 0 2 2 2 2 2 2 2 2 2 1 0 8 9 0

The sum of the across clues was 891873821817653.

There were 40 entries, 37 of which were correct. The randomly selected winners are:

1. Laurence, who wins a £100 Maths Gear goody bag,
2. Robert Hannan, who wins a Chalkdust T-shirt,
3. James, who wins a Chalkdust T-shirt,
4. Thomas Smith, who wins a Chalkdust T-shirt.

Well done to Laurence, Robert, James and Thomas, and thanks to everyone else who attempted the crossnumber. See you shortly in issue 11…

# Prize crossnumber, Issue 10

Our original prize crossnumber is featured on pages 48 and 49 of Issue 10.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
• To enter, enter the sum of the across clues below by 2 February 2020. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 14 March 2020.

Correction: Clue 13A has been corrected to “49A reversed” instead of “49D reversed”.
Correction: Clue 38D has been corrected to “33A less than 39D” instead of “33A less than 39A”.
Clarificiation: The triangle in 6D is a right-angled triangle.

# Prize crossnumber, Issue 09

Our original prize crossnumber is featured on pages 54 and 55 of Issue 09.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
• To enter, enter the sum of the across clues below by 9 September 2019. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 28 September 2019.

# Prize crossnumber, Issue 08

Our original prize crossnumber is featured on pages 54 and 55 of Issue 08.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Word DVD, a dodecaplex puzzle and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. The prizes have been provided by Maths Gear, a website that sells nerdy things worldwide. Find out more at mathsgear.co.uk
• To enter, submit the sum of the across clues via this form by 2 February 2019. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 16 February 2019.

# Prize crossnumber, Issue 07

Our original prize crossnumber is featured on pages 52 and 53 of Issue 07.

Clarification: Added “non-zero” to clues 10A, 19D.
Clarification: For 20D, 0 is not a factor of any number, so the number contains no 0s.

### Rules

• Although many of the clues have multiple answers, there is only one solution to the completed crossnumber. As usual, no numbers begin with 0. Use of Python, OEIS, Wikipedia, etc. is advised for some of the clues.
• One randomly selected correct answer will win a £100 Maths Gear goody bag. Three randomly selected runners up will win a Chalkdust t-shirt. The prizes have been provided by Maths Gear, a website that sells nerdy things worldwide, with free UK shipping. Find out more at mathsgear.co.uk
• To enter, submit the sum of the across clues via this form by 1 August 2018. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 19 August 2018.