### Star Battle (Myopia) by JinHoo Ahn

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or solve online (using our beta test of Penpa-Edit tools; in composite Star Battle mode a left click places a star, right click in a cell marks off the cell, and a right click on an edge or corner marks in a dot as a placement note.)

Theme: Parquet

Author/Opus: This is the 41st puzzle from our contributing puzzlemaster JinHoo Ahn.

Rules: Standard Star Battle rules. Two stars per row, column, and region. Also, the arrow clues indicate all the directions (up, down, left, and right) where the nearest stars are located when looking from that square.

Difficulty: 2.5 stars

Time Standards (highlight to view): Grandmaster = 3:00, Master = 4:15, Expert = 8:30

Solution: PDF; a solution video is also available here.

Note: Follow this link for other classic Star Battles and this link for Star Battle variations. If you are new to this puzzle type, here are our easiest Star Battles to get started on. More Star Battle puzzles can be found in The Art of Puzzles, in the books Star Battle by JinHoo Ahn and Star Battle 2 by JinHoo Ahn and Murat Can Tonta, and in our beginner-friendly collection Intro to GMPuzzles by Serkan Yürekli.

• Chandrachud says:

Lovely puzzle….nice variation. Saw a similar puzzle type in LMI PR Round … was called star gazing … didn’t have regions though …. more like myopia gaps.

• DF says:

Really enjoyed this variation

• bert says:

Some lovely logic here…Never seen this variant before.

• drsudoku says:

My first experience with the variation was with the four puzzles JinHoo wrote for the Star Battle 2 book here. While the Myopia rule is known for some other genres, it does work well as an internal clue for Star Battle and we’re excited to see more authors explore it a bit.

• David Glasser says:

if anyone wants it, here’s a penpa of the example puzzle: https://tinyurl.com/ycq2whgd

• R says:

Thanks David Glasser for the example, did it and it really helped to test out some deductions for the rules

• eqp says:

Thank you so much for this!

• Para says:

This variant was originally introduced at the WPC in Senec in 2016.

• Deanna says:

Is it an explicit rule or not that the arrow spaces can’t have stars in them as well? Would have been nice to know.

• mender says:

I don’t believe it was made explicit that if a cell has more than one arrow, the nearest stars in those directions must each be the same distance from that cell.
I wasn’t able to complete the puzzle until I had that information.

• crema says:

i feel you. i was doing a wcpn round for fun and absolutely suffered for half an hour until i made that deduction.

• crema says:

awesome puzzle! really felt like i was unlearning how to do star battles while solving

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