Vedio time. 26:55 After 4s X WING, we can get BUG +1 in R7C2 (489) is +1. Only one cell got three candidates and rest of all filled with bivalue cells. Only 8 is three times in Row/Col/Box., so 8 must be centering and placed. Puzzle solved. Vedio time 19:11. Puzzle solved only one strategy., XY CHAIN... 1458. R8C7 (85) R4C7 (58) R4C3 (84) R3C3 (41) R2C2 (18). 8 eliminate from R9C2 (89= 9). Puzzle solved. Nice entertainment puzzle. Thanks.
Excellent.
Vedio time. 26:55
After 4s X WING, we can get BUG +1 in R7C2 (489) is +1. Only one cell got three candidates and rest of all filled with bivalue cells. Only 8 is three times in Row/Col/Box., so 8 must be centering and placed. Puzzle solved.
Vedio time 19:11.
Puzzle solved only one strategy.,
XY CHAIN... 1458.
R8C7 (85)
R4C7 (58)
R4C3 (84)
R3C3 (41)
R2C2 (18).
8 eliminate from R9C2 (89= 9). Puzzle solved.
Nice entertainment puzzle. Thanks.