Logic Masters Deutschland e.V.

Initial Setter Difficulty: 3/5, but could drop to 2/5 after review.

Normal Sudoku rules apply.
Place the digits 1-9 so that they do not repeat in any row, column, or 3x3 box.

Dutch Flats
Every 5 in the grid must have a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both.

Average Arrows
The digit in a circle represents the exact arithmetic mean of all digits along any individual arrow emerging from that circle.

Battenburg
Whenever 2 odd and 2 even digits form a 2x2 checkerboard pattern (e.g. R2C1 and R3C2 even, R2C2 and R3C1 odd), a Battenburg marking is given. If there is no such marking, the above pattern is not allowed.

This is another rare double constraint Flat Mate puzzle. Battenburg is a great constraint but it wouldn't have been powerful enough to resolve a Flat Mate on its own; Average Arrows may have been powerful enough alone, but it's not a puzzle I'd want to set or solve; so they are blended here in a puzzle that I hope you enjoy.

Special Thanks
Thank you to Marty Sears for last weeks puzzle! I look forward to your series return soon!

Big News!!
Next week we have another new setter joining the series!
A great setter with a recently new constraint type, and they're adding a Flat Mate spin!

To play this puzzle please click here: Play CTC

Previous puzzles in the Dutch Flat Mates series:

• #01 - 18 Oct 23 - Classic
• #02 - 25 Oct 23 - Thermometers
• #03 - 01 Nov 23 - German Whispers
• #04 - 08 Nov 23 - Region Sum Lines
• #05 - 15 Nov 23 - Sandwich Sums
• #06 - 22 Nov 23 - Little Killer
• #07 - 29 Nov 23 - Kropki
• #08 - 05 Dec 23 - Zipper Lines
• #09 - 12 Dec 23 - Renban - By GoodCity
• #10 - 19 Dec 23 - Nabner - By GoodCity
• #11 - 26 Dec 23 - Skyscrapers - By GoodCity
• #12 - 03 Jan 24 - Dutch Whispers
• #13 - 10 Jan 24 - Killer Cages
• #14 - 17 Jan 24 - Arrows
• #15 - 24 Jan 24 - Ten Lines
• #16 - 31 Jan 24 - 159 Index and Even - By GoodCity
• #17 - 07 Feb 24 - Friendly Cells
• #18 - 14 Feb 24 - Quads
• #19 - 21 Feb 24 - Silent Killer - By GoodCity
• #20 - 28 Feb 24 - XV and Equality
• #21 - 06 Mar 24 - X-Sums
• #22 - 13 Mar 24 - Numbered Rooms - By GoodCity
• #23 - 20 Mar 24 - Diagonal X-Sums
• #24 - 27 Mar 24 - Yin Yang (Neighborhoods) - By Palpot
• #25 - 03 Apr 24 - Hit Points
• #26 - 10 Apr 24 - Counting Circles
• #27 - 17 Apr 24 - XY Difference - By GoodCity
• #28 - 24 Apr 24 - Double Sandwich Sums
• #29 - 01 May 24 - Foggy Knights
• #30 - 08 May 24 - Look and Say Little Killer
• #31 - 15 May 24 - Slingshot - By GoodCity
• #32 - 22 May 24 - 258 Index and Odd
• #33 - 29 May 24 - Rellik
• #34 - 05 Jun 24 - Search 9 - By Palpot
• #35 - 12 Jun 24 - Diagonal Outside
• #36 - 19 Jun 24 - Entropic Snake - Collab with Palpot
• #37 - 26 Jun 24 - Rossini - By GoodCity
• #38 - 03 Jul 24 - Pointer Arrows
• #39 - 10 Jul 24 - Same Difference - by Marty Sears

Hint to Start

Colouring odds/evens (Parity) will definitely help, using the negative constraint on the Battenburg clues to make more progress.
Parity remains the key to a lot of deductions, with R1C1 being the key to the break in, but don't forget Flat Mates.

This Weeks Puzzle