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Weekly Challenge 180: Chess or Antichess

#1

Weekly Challenge 180: Chess or Antichess

Create a study showing a game of Antichess with the most standard chess checkmate positions.

Adjudication Criteria:
1. Largest number of checkmate postions
2. Earliest checkmate position (in ply)
3. Earliest entry

Additional Restrictions:
- Put the number of checkmate positions and the earliest checkmate ply achieved in the forum post
- Do not edit the forum post after posting. This will invalidate your entry
- If the study chapter's moves don't match what is claimed in the forum post then the entry will be invalid

If you wish to improve your study and submit a better entry, please clone your original study into a new one, make changes in the new study and make a new forum post with the details and new study link.

This week's challenge is based on idea that was suggested to us by @LeftCleverGlove. If you want to suggest a challenge please message @statmatt or @jheps and it will be considered!

Closing Date: Monday 5th October 1200 UTC+0

#2

playstrategy.org/study/suryPDol

Mate after third move black is mate
Mate after 9. move White is mate
Mate after 22. move white is mate
After 23. move white he is still mate.
Are this three or four mates?

#5

2…Qh4,7.Nxc7,9.Nc7,11.Nc7,13.Nc7,15.Nd6,16.gxh5,34…Rg1,35…Bxe7,41…Rxa1,42…hxg2,46…Ra1

#9

@woll the first example you give is interesting, but it is just 3 because the 4th one is technically an illegal position in chess because it is winner's turn. Your second example contains 9 mates.
The other two entries are verified. @LeftCleverGlove leads the challenge at this moment with 14.

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