求助

R2C4 的25
R1C6 的45
R2C8 的24
构成了xy-wing

R1C2 的 25
R3C1 的 24
R1C6 的 45
构成了xy-wing

W-Wing: 5/2 in r1c2,r2c4 connected by 2 in r3c15 => r1c6,r2c2<>5
W-Wing: 4/2 in r2c8,r3c1 connected by 2 in r1c28 => r2c1<>4
http://tieba.baidu.com/p/510840895