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 24-02-2021 Valdas Bieliauskas:

A.Malyuta, A.Balanyuk, R.Matskyavichyus "Tainstva shashechnykh kvadratov" [278], 2015

Other thematic variants of this Zadacha, please, see below:

Thematic variant: 1. 35-40 30x48 2. 12-21 26x17 3. 28x11 06x17 4. 27-21 17x26 5. 31-04 48x31 6. 04x47 26-31 7. 46-37 31x42 8. 33-28 42x22 9. 32-27 22x31 10. 47-36 31-37 11. 36-31 37x26 12. 19-13~ 26-31 13. 13-08 31-37 14. 24-30~ 15x35 15. 08-02+- 37-41 16. 50-45~ 41-46 17. 49-32 46x50 18. 02-16 35x44 19. 16-49 [K50; M44].