4
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Source

The image below shows a solved pentomino puzzle in a $6\times10$ grid.

Start

Your challenge is to divide the rectangle along the black lines only to make two pieces that can be rearranged and fit together again to make the $7\times9$ rectangle below with three holes in it.

Finish

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  • $\begingroup$ Do you make the colored pentomino pattern in any software? Or just Paint-craft? $\endgroup$ – Przemyslaw Remin Feb 11 at 10:22
  • $\begingroup$ @PrzemyslawRemin I used MS Excel, I think. $\endgroup$ – Engineer Toast Feb 11 at 17:20
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You can split the rectangle along a jagged line from the bottom left to the top right into two approximate triangles:

PPPLIIIII
PPSLLLL
SSSNNN
SFNN
FFF
F

        T
      TTT
     XUUT
   WXXXUV
  YWWXUUV
YYYYWWVVV

Shifting the bottom-right triangle down and left one unit from its original location, we get a new 7x9 rectangle with three holes:

PPPLIIIII
PPSLLLL.T
SSSNNNTTT
SFNN.XUUT
FFFWXXXUV
F.YWWXUUV
YYYYWWVVV

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  • $\begingroup$ Can you edit to add an explanation to your answer? This is a bit incomprehensible at the moment. $\endgroup$ – IAmInPLS Dec 23 '16 at 13:25
  • $\begingroup$ I edited it. I hope that helps. BTW, I always forget how to do preformatted text in spoilers. Sorry about that. $\endgroup$ – Jaap Scherphuis Dec 23 '16 at 13:28
  • $\begingroup$ That's alright ;-) $\endgroup$ – IAmInPLS Dec 23 '16 at 13:42
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Not wanting to submit this as the correct answer but hoping to add clarification... @JaapScherphuis seems to have this one correct. The answer actually seemed a bit too obvious to me though...

enter image description here

The shapes to the bottom right of the original image have been cut and moved down and left, each by one square.

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  • $\begingroup$ You're right that it's not too hard of a puzzle. I just liked the idea of pentominoes. $\endgroup$ – Engineer Toast Dec 23 '16 at 13:51

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