Djab: I have the feeling that there is a mistake in one of the solutions claimed "correct":
R4 S4 R5 Q6 S5 S3 S1 P4 T2 R6 and then, I think the correct move to make a second eye in the corner is T4 and not R1
Indeed, after R1, the opponent can answer S2 which prevents the eye in the corner and win the race at S6
Resolved.