There are many ways to get to less than 900 moves.
I will give one of them here. This is not really the intended way of solving it. Still, enough to give a different perspective. Solution(pushes 384, moves 853, inlines 212, changes 192, sessions 123):
DDDDrrdDlUruLLLDLLLLUURDDldRRurDllddllddlLddddllURdrUUUlDuURUUUUdddddddddddddddrdRRdRRURDRdrrURUrrrrrurUUrUULURUruuLULuuuuuluLLuLLdlUluluuLULURRRDRRDRRRDRRDRDRDDRDDDRRRUULDDDRDDDLLLrDDDRDLulDDDDrrDrdLLLLLrrrrrrruuLLLruLrRdDrdLLLLLLuuuruurrDDDLLulDDuuruRDrdLLulDrDLurrrDrdLDDLLLLDLDLUURRdRdLLulLDuULLDLLLLUdDLLLULLLURlLLLLUUdLULUUrUUlUdrddldlluuuuuuurruuuurUUUUllldddRRuUddlluuRuRRdrUllldRRdlddddddllddrRUUUUUUUdrUUdlllddRUluRRUUluRRlddddDDDDllddrrddLrrddlLUlUUUUddddrddlUUUUUrrUUUUUUUdrUdlddddddddLdlUUddddrrdrUddrdrruuLuLLUUrDlddlUdrdrRuuLulLUUddLdlUUUrrUUUUUUUUluRUUluRdddddddRRuRurDDDuLLDRDDrddddrdrrdrrrrdRRururrrrruruuruuuurUUluluuuuulullLLLrrddllddLLUUddddrrRRuuUUUdllllllddRlLLUUUdddddrrUdRRRRUdddLLUdrrrrUULrUUUUrrddLrddLrddLrddllDDlluuUdRlllLLUUUdRlLLddRlDDRRuUUdlluuUUUUUUllddRlddRlddRlddRlddddrrUdrrUUUdddrruuUdLrddrrUUUdLrddrrrruuLLLrrrddllU
It should be obvious if you see the path.
I will submit a solution to a different level instead: http://www.game-sokoban.com/index.php?mode=ulevel&lid=4741
Hopefully, it will get some of you interested to submit more solutions to the Secxyiii set.
Hello, Anian, please, please, do it !
Nevermind, I found that it is possible to have a solution less than 800 moves.
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