Other Puzzles

Articles and puzzles on this site that I’ve created, and miscellaneous puzzles that have interested me:

Articles

• Bit twiddling / 20th May 2017
• Solving Alphametics with Python, Part 2 / 29th June 2016
• Solving Alphametics with Python / 22nd June 2016
• Running the first program: Part 3 / 21st October 2015
• Running the first program: Part 2 / 14th October 2015
• Running the first program / 24th September 2015

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Puzzles

• Teaser 2907: Combinatorial cards / 2nd January 2019
• Teaser 2935: A palindrome / 24th December 2018
• Teaser 2503 / 29th August 2018
• Grid puzzle / 27th June 2018
• Pizza puzzle / 23rd November 2016
• Teaser 2784: Three lives / 14th February 2016
• Teaser 2773: King Lear III / 15th November 2015
• Teaser 2759: King Lear II / 14th August 2015
• Singapore school logic puzzle / 24th April 2015
• Project Euler: Problem 369 / 6th February 2012
• Project Euler: Problem 142 (see: Enigma 45)

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And here are some other puzzles that I have programmed solutions for (although they are not all uploaded):

New Scientist Back Page Puzzles

In May 2019 New Scientist started a new series of puzzles:

2019

• Puzzle #22: The 9-minute egg / 21st September 2019
• Puzzle #21: Six weeks of seconds / 14th September 2019
• Puzzle #20: Caesar cipher / 7th September 2019
• Puzzle #19: The vicar’s age / 31st August 2019
• Puzzle #18: Cable on the moon / 24th August 2019
• Puzzle #17: Which flipping year? / 17th August 2019
• Puzzle #16: Clever code / 10th August 2019
• Puzzle #15: Lines through the chessboard / 3rd August 2019
• Puzzle #14: The H coins problem / 27th July 2019
• Puzzle #13: Snail party / 20th July 2019
• Puzzle #12: Hole of the moon / 13th July 2019
• Puzzle #11: Lunar years / 13th July 2019
• Puzzle #10: Betty’s change / 6th July 2019
• Puzzle #09: The cake and the candles / 29th June 2019
• Puzzle #08: Prisoners locked up / 22nd June 2019
• Puzzle #07: Amveriric’s boat / 15th June 2019
• Puzzle #06: Darts challenge / 8th June 2019
• Puzzle #05: Murphy’s law of socks / 1st June 2019
• Puzzle #04: Which door? / 25th May 2019
• Puzzle #03: Cube shadow / 18th May 2019
• Puzzle #02: Getting past the freight train / 11th May 2019
• Puzzle #01: The book of numbers / 4th May 2019

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Sunday Times Teasers

2019

• Teaser 2974: Flockbuster / 22nd September 2019
• Teaser 2973: Something in common / 15th September 2019
• Teaser 2972: A relaxing day / 8th September 2019
• Teaser 2971: Six sisters on the ski lift / 1st September 2019
• Teaser 2970: Puzzling powers / 24th August 2019
• Teaser 2969: Slide rules / 18th August 2019
• Teaser 2968: Gardening division / 11th August 2019
• Teaser 2967: Odds and evens / 4th August 2019
• Teaser 2966: On track / 28th July 2019
• Teaser 2965: Knock, knock! / 21st July 2019
• Teaser 2964: “Bingo a go-go” lingo a no-go / 14th July 2019
• Teaser 2963: A result / 7th July 2019
• Teaser 2962: Book receipts / 30th June 2019
• Teaser 2961: Alan and Cat / 23rd June 2019
• Teaser 2960: Bags of sweets! / 16th June 2019
• Teaser 2959: The Magnificent Seven / 9th June 2019
• Teaser 2958: Sudoku crossword / 2nd June 2019
• Teaser 2957: Beyond the fields we know / 26th May 2019
• Teaser 2956: A nice little earner / 19th May 2019
• Teaser 2955: Go forth and multiply / 12th May 2019
• Teaser 2954: Lovely meter, RITA made! / 5th May 2019
• Teaser 2953: Marble tower / 28th April 2019
• Teaser 2952: Silly slip / 21st April 2019
• Teaser 2951: Imprismed / 14th April 2019
• Teaser 2950: Ten digits / 7th April 2019
• Teaser 2949: Mystery numbers / 31st March 2019
• Teaser 2948: A hardy annual / 24th March 2019
• Teaser 2947: 55 Divisions / 17th March 2019
• Teaser 2946: Pentagonal gardens / 10th March 2019
• Teaser 2945: Infernal indices / 3rd March 2019
• Teaser 2944: Happy families / 24th February 2019
• Teaser 2943: Keep your balance / 17th February 2019
• Teaser 2942: What do points make? / 10th February 2019
• Teaser 2941: Big deal / 3rd February 2019
• Teaser 2940: Getting there in the end / 27th January 2019
• Teaser 2939: Betting to win / 20th January 2019
• Teaser 2938: Numerophobia / 13th January 2019
• Teaser 2937: Long division / 6th January 2019

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2018

• Teaser 2936: Multicoloured / 30th December 2018
• Teaser 2935: A palindrome / 23rd December 2018
• Teaser 2934: Good arraz, Baz! / 16th December 2018
• Teaser 2933: Sunday Teaser / 9th December 2018
• Teaser 2932: Triangulation / 2nd December 2018
• Teaser 2931: Unfortunate 57 / 25th November 2018
• Teaser 2930: Odd socks / 18th November 2018
• Teaser 2929: My PIN numbers / 11th November 2018
• Teaser 2928: Golf balls / 4th November 2018
• Teaser 2927: On a roll / 28th October 2018
• Teaser 2926: Coins of Obscura / 21st October 2018
• Teaser 2925: The eternal triangle – Go figure! / 14th October 2018
• Teaser 2924: Snaking up / 7th October 2018
• Teaser 2923: Powerful numbers / 30th September 2018
• Teaser 2922: Inscribed / 23rd September 2018
• Teaser 2921: Octavia the octogenarian / 16th September 2018
• Teaser 2920: Barcode / 9th September 2018
• Teaser 2919: Letters puzzle / 2nd September 2018
• Teaser 2918: Prime multiplication / 26th August 2018
• Teaser 2917: Polygoland / 19th August 2018
• Teaser 2916: Pointless batting averages / 12th August 2018
• Teaser 2915: £sd / 5th August 2018
• Teaser 2914: Bank statement / 29th July 2018
• Teaser 2913: Return tickets / 22nd July 2018
• Teaser 2912: Be crafty and box clever / 15th July 2018
• Teaser 2911: Remembering PINs / 8th July 2018
• Teaser 2910: Living on the coast / 1st July 2018
• Teaser 2909: Pensionable service / 24th June 2018
• Teaser 2908: Number challenge / 17th June 2018
• Teaser 2907: Combinatorial cards / 10th June 2018
• Teaser 2906: In proportion / 3rd June 2018
• Teaser 2905: Trackword / 27th May 2018 (see also: Grid puzzle)
• Teaser 2904: Catching another bus / 20th May 2018
• Teaser 2903: What’s my card? / 13th May 2018
• Teaser 2902: Birthdays 2018 / 6th May 2018
• Teaser 2901: Square deal / 29th April 2018
• Teaser 2900: An ancestral equation / 22nd April 2018
• Teaser 2899: Base jumping / 15th April 2018
• Teaser 2898: My valentine / 8th April 2018
• Teaser 2897: Easter egg / 1st April 2018
• Teaser 2896: Light angles / 25th March 2018
• Teaser 2895: Spanish and Latin / 18th March 2018
• Teaser 2894: Time duality / 11th March 2018
• Teaser 2893: Win some, lose some / 4th March 2018
• Teaser 2892: Political pairings / 25th February 2018
• Teaser 2891: Nine cut diamonds / 18th February 2018
• Teaser 2890: Squares on cubes / 11th February 2018
• Teaser 2889: Catching the bus / 4th February 2018
• Teaser 2888: Two sums / 28th January 2018
• Teaser 2887: A convivial dinner party / 21st January 2018
• Teaser 2886: Metal arithmetic / 14th January 2018
• Teaser 2885: Croquet mallet / 7th January 2018

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2017

• Teaser 2884: Farewell / 31st December 2017
• Teaser 2883: Happy Xmas / 24th December 2017
• Teaser 2882: Snow White / 17th December 2017
• Teaser 2881: A month of meetings / 10th December 2017
• Teaser 2880: Golfing greats / 3rd December 2017
• Teaser 2879: Blood line / 26th November 2017
• Teaser 2878: Magic slides / 19th November 2017
• Teaser 2877: Four steadings and a numeral / 12th November 2017
• Teaser 2876: Bonfire toffee / 5th November 2017
• Teaser 2875: Easy as ABC / 29th October 2017
• Teaser 2874: An age-old progression / 22nd October 2017
• Teaser 2873: Circular logic / 15th October 2017
• Teaser 2872: Appropriate arithmetic / 8th October 2017
• Teaser 2871: Five-card trick / 1st October 2017
• Teaser 2870: Lucky dip / 24th September 2017
• Teaser 2869: Cubic savings / 17th September 2017
• Teaser 2868: Prime logic / 10th September 2017
• Teaser 2867: Clumsy Meg / 3rd September 2017
• Teaser 2866: On the rack / 27th August 2017
• Teaser 2865: Seventh heaven? / 20th August 2017
• Teaser 2864: Sequence of squares / 13th August 2017
• Teaser 2863: Little time / 6th August 2017
• Teaser 2862: Algebria’s standard / 30th July 2017
• Teaser 2861: Fond memories / 23rd July 2017
• Teaser 2860: Cricketing greats / 16th July 2017
• Teaser 2859: Palindromic / 9th July 2017
• Teaser 2858: Beach game / 2nd July 2017
• Teaser 2857: Significant errors / 25th June 2017
• Teaser 2856: Solid jellometry / 18th June 2017
• Teaser 2855: Fab Four / 11th June 2017
• Teaser 2854: Power surge / 4th June 2017
• Teaser 2853: Marble marvel / 28th May 2017
• Teaser 2852: When in Rome / 21st May 2017
• Teaser 2851: Knowing the lingo / 14th May 2017
• Teaser 2850: On course / 7th May 2017
• Teaser 2849: Swift tailor / 30th April 2017
• Teaser 2848: Coffee breaks / 23rd April 2017
• Teaser 2847: Easter parade / 16th April 2017
• Teaser 2846: Bingo! / 9th April 2017
• Teaser 2845: Baled Out / 2nd April 2017
• Teaser 2844: Children’s children / 26th March 2017
• Teaser 2843: Child’s play / 19th March 2017
• Teaser 2842: The best policy / 12th March 2017
• Teaser 2841: Crenellation aggregation / 5th March 2017
• Teaser 2840: Signs of the Times / 26th February 2017
• Teaser 2839: Unwholesome / 19th February 2017
• Teaser 2838: King Lear IV / 12th February 2017
• Teaser 2837: Back and forth / 5th February 2017
• Teaser 2836: Squaring up / 29th January 2017
• Teaser 2835: Jeweller’s rouge / 22nd January 2017
• Teaser 2834: Degrees of freedom / 15th January 2017
• Teaser 2833: Celebrity dogs / 8th January 2017
• Teaser 2832: A New Year Reminiscence / 1st January 2017

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2016

• Teaser 2831: Nine ladies dancing / 25th December 2016
• Teaser 2830: Time for Christmas / 18th December 2016
• Teaser 2829: Making a dozen / 11th December 2016
• Teaser 2828: Return to Zenda / 4th December 2016
• Teaser 2827: Password / 27th November 2016
• Teaser 2826: By Heck! / 20th November 2016
• Teaser 2825: Twin sets / 13th November 2016
• Teaser 2824: New extension / 6th November 2016
• Teaser 2823: Queuing / 30th October 2016
• Teaser 2822: Losing weight / 23rd October 2016
• Teaser 2821: Magic cards / 16th October 2016
• Teaser 2820: Three ages / 9th October 2016
• Teaser 2819: An age-old problem / 2nd October 2016
• Teaser 2818: Accountability / 25th September 2016
• Teaser 2817: Our secret / 18th September 2016
• Teaser 2816: Chat shows / 11th September 2016
• Teaser 2815: PIN-in-the-middle / 4th September 2016
• Teaser 2814: Today’s Teaser / 28th August 2016
• Teaser 2813: Katy’s piggy banks / 21st August 2016
• Teaser 2812: Sum card trick / 14th August 2016
• Teaser 2811: Making arrangements / 7th August 2016
• Teaser 2810: Almost a year apart / 31st July 2016
• Teaser 2809: This and that / 24th July 2016
• Teaser 2808: Hot stuff / 17th July 2016
• Teaser 2807: Pentagons / 10th July 2016
• Teaser 2806: Jack’s jigsaw / 3rd July 2016
• Teaser 2805: Greek urns / 26th June 2016
• Teaser 2804: Spots before the eyes / 19th June 2016
• Teaser 2803: Easy as ABC / 12th June 2016
• Teaser 2802: That’s the ticket! / 5th June 2016
• Teaser 2801: End of season / 29th May 2016
• Teaser 2800: Promoting rugby / 22nd May 2016
• Teaser 2799: Desert patrol / 15th May 2016
• Teaser 2798: Housey-housey / 8th May 2016
• Teaser 2797: Sunday Times Table / 1st May 2016
• Teaser 2796: George and the Dragon / 24th April 2016
• Teaser 2795: No mean feat / 17th April 2016
• Teaser 2794: D-day / 10th April 2016
• Teaser 2793: Sum triangles / 3rd April 2016
• Teaser 2792: Easter Teaser / 27th March 2016
• Teaser 2791: Four-square family / 20th March 2016
• Teaser 2790: Factoidels / 13th March 2016
• Teaser 2789: Uncle’s gift (2) / 6th March 2016
• Teaser 2788: Red-letter days / 28th February 2016
• Teaser 2787: Crime-writers convention / 21st February 2016
• Teaser 2786: Out of order / 14th February 2016
• Teaser 2785: Uncle’s gift (1) / 7th February 2016
• Teaser 2784: Three lives / 31st January 2016
• Teaser 2783: Old boys’ banquet / 24th January 2016
• Teaser 2782: Spiders / 17th January 2016
• Teaser 2781: Number time / 10th January 2016
• Teaser 2780: Calendar dice / 3rd January 2016

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2015

• Teaser 2779: New Year Party / 27th December 2015 (also here)
• Teaser 2778: Cold turkey / 20th December 2015
• Teaser 2777: Summing up 2015 / 13th December 2015
• Teaser 2776: Winning months / 6th December 2015
• Teaser 2775: Strictly not / 29th November 2015
• Teaser 2774: Loaded dice / 22nd November 2015
• Teaser 2773: King Lear III / 15th November 2015
• Teaser 2772: Madam I’m Adam / 8th November 2015
• Teaser 2771: All Saints Day / 1st November 2015
• Teaser 2770: Football fans / 25th October 2015
• Teaser 2769: Coming home / 18th October 2015
• Teaser 2768: In the bag / 11th October 2015
• Teaser 2767: Cutting corners / 4th October 2015
• Teaser 2766: Two by two / 27th September 2015
• Teaser 2765: Prime points / 20th September 2015
• Teaser 2764: Three little lists / 13th September 2015
• Teaser 2763: Golf challenge / 6th September 2015
• Teaser 2762: What a gem! / 30th August 2015
• Teaser 2761: Digital shuffle / 23rd August 2015
• Teaser 2760: Prime location / 16th August 2015
• Teaser 2759: King Lear II / 9th August 2015
• Teaser 2758: Square dance / 2nd August 2015
• Teaser 2757: Sports quiz / 26th July 2015
• Teaser 2756: Terrible teens / 19th July 2015
• Teaser 2755: Female domination / 12th July 2015
• Teaser 2741: Neater Easter Teaser / 5th April 2015
• Teaser 2736: HS2 / 1st March 2015

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2014

• Teaser 2705: In the pub / 25th July 2014
• Teaser 2700: Spell check / 20th June 2014
• Teaser 2699: Low power / 13th June 2014
• Teaser 2684: How safe? / 28th February 2014
• Teaser 2683: House-to-house / 20th February 2014
• Teaser 2682: 007 / 14th February 2014
• Teaser 2681: Inconsequential / 7th February 2014
• Teaser 2677: One for each day / 10th January 2014

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2013

• Teaser 2674: Roll model / 22nd December 2013
• Teaser 2672: 11, 12, 13 … / 6th December 2013
• Teaser 2663: Missed the plot / 4th October 2013
• Teaser 2662: Number please / 27th September 2013
• Teaser 2655: Sudoprime / 11th August 2013

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2011

• Teaser 2565: Red and black / 20th November 2011
• Teaser 2549: A round trip / 31st July 2011
• Teaser 2529 / 13th March 2011

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2010

• Teaser 2505 / 26th September 2010
• Teaser 2503 / 12th September 2010
• Teaser 2500 / 22nd August 2010

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1991 – 2004

• Teaser 2161: Love Hearts / 15th February 2004 (?)
• Teaser 1986: Protracted calculation / 8th October 2000
• Teaser 1973: Straw Store / 9th July 2000
• Teaser 1795: Dicey columns / 9th February 1997
• Brainteaser 1712: Squambling / 9th July 1995
• Brainteaser 1688: Sunday paper / 22nd January 1995
• Brainteaser 1675: The A-to-Z of sport / 16th October 1994
• Brainteaser 1661: Goals galore / 10th July 1994
• Brainteaser 1659: Prime cuts / 26th June 1994
• Brainteaser 1657: Not a black and white case / 12th June 1994
• Brainteaser 1649: Ages and ages! / 17th April 1994
• Brainteaser 1635: Double anagram / 9th January 1994
• Brainteaser 1633: New Year’s resolution / 26th December 1993
• Brainteaser 1631: Ali Baba’s boxes / 12th December 1993
• Brainteaser 1629: Tangle o’ the aisles / 28th November 1993
• Brainteaser 1625: Jolly sticks / 31st October 1993
• Brainteaser 1611: Scrambled egg / 25th July 1993
• Brainteaser 1610: Word game / 18th July 1993
• Brainteaser 1590: Demonoes / 23rd July 1993
• Brainteaser 1575: Quantum scales / 15th November 1992
• Brainteaser 1568: Back to the future / 27th September 1992
• Brainteaser 1567: How many teams? / 20th September 1992
• Brainteaser 1563: Family sum / 23rd August 1992
• Brainteaser 1557: An alphabetical jigsaw / 12th July 1992
• Brainteaser 1547: Doing the rounds / 3rd May 1992
• Brainteaser 1542: Precisely what do I mean? / 29th March 1992
• Brainteaser 1538: Times square / 1st March 1992
• Brainteaser 1510: Sum puzzle / 18th August 1991
• Brainteaser 1505: Waste not … / 14th July 1991

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1971

• Brain-Teaser 501 / 10th January 1971

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1970

• Brain-Teaser 499 / 20th December 1970
• Brain-Teaser 497 / 6th December 1970
• Brain-Teaser 496 / 29th November 1970
• Brain-Teaser 495 / 22nd November 1970
• Brain-Teaser 494 / 15th November 1970
• Brain-Teaser 493 / 8th November 1970
• Brain-Teaser 492 / 1st November 1970
• Brain-Teaser 491 / 25th October 1970
• Brain-Teaser 490 / 18th October 1970
• Brain-Teaser 489 / 11th October 1970
• Brain-Teaser 488 / 4th October 1970
• Brain-Teaser 487 / 27th September 1970
• Brain-Teaser 486 / 20th September 1970
• Brain-Teaser 485 / 13th September 1970
• Brain-Teaser 484 / 6th September 1970
• Brain-Teaser 483 / 30th August 1970
• Brain-Teaser 482 / 23rd August 1970
• Brain-Teaser 481 / 16th August 1970
• Brain-Teaser 480 / 9th August 1970
• Brain-Teaser 479 / 2nd August 1970
• Brain-Teaser 478 / 26th July 1970
• Brain-Teaser 477 / 19th July 1970
• Brain-Teaser 476 / 12th July 1970
• Brain-Teaser 475 / 5th July 1970
• Brain-Teaser 474 / 28th June 1970
• Brain-Teaser 473 / 21st June 1970
• Brain-Teaser 472 / 14th June 1970
• Brain-Teaser 471 / 7th June 1970
• Brain-Teaser 470 / 31st May 1970
• Brain-Teaser 469 / 24th May 1970
• Brain-Teaser 468 / 17th May 1970
• Brain-Teaser 467 / 10th May 1970
• Brain-Teaser 466 / 3rd May 1970
• Brain-Teaser 465 / 26th April 1970
• Brain-Teaser 464 / 19th April 1970
• Brain-Teaser 463 / 12th April 1970
• Brain-Teaser 462 / 5th April 1970
• Brain-Teaser 461 / 29th March 1970
• Brain-Teaser 460 / 22nd March 1970
• Brain-Teaser 459 / 8th March 1970
• Brain-Teaser 458 / 1st March 1970
• Brain-Teaser 457 / 15th February 1970
• Brain-Teaser 456 / 8th February 1970
• Brain-Teaser 455 / 1st February 1970
• Brain-Teaser 454 / 25th January 1970
• Brain-Teaser 453 / 18th January 1970
• Brain-Teaser 452 / 11th January 1970
• Brain-Teaser 451 / 4th January 1970

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