Chequered pattern

Tested and photo by Ellie :)
CHEQUERED
CO 45
1-6. K
7. K4 *K7, P5* 3X, K5
8 AND ALT ROWS-K4, K THE K AND P THE P, K4
9. K4 *K7, P5* 3X, K5
11. K4 *K7, P5* 3X, K5
13. K5 *P5, K7* 3X, K4
15. K5 *P5, K7* 3X, K4
17. K5 *P5, K7* 3X, K4
18. K4, K THE K AND P THE P, K4
19-54. REP 7-18 3 MORE TIMES
55-60. K
BO