Three cells with two candidates each form a pivot and two wings, and any cell that sees both wings cannot hold their shared digit.
Where to lookA pointer first: look at row 1, column 4. It can only be 4 or 5.XY-WingThe pivot, row 1, column 4, can only be 4 or 5. If it is 4, row 1, column 1 is 2; if it is 5, row 3, column 5 is 2. Either way one of them is 2, so no cell that shares a group with both can be 2.
Find a pivot with candidates A and B. Then find a wing with A and C and another with B and C, each sharing a region with the pivot. Whether the pivot is A or B, one wing becomes C. Remove C from every cell that sees both wings.
This example, step by step
Where to lookA pointer first: look at row 1, column 4. It can only be 4 or 5.
XY-WingThe pivot, row 1, column 4, can only be 4 or 5. If it is 4, row 1, column 1 is 2; if it is 5, row 3, column 5 is 2. Either way one of them is 2, so no cell that shares a group with both can be 2.
In hints
The hint first gives a direction. Blue marks the pivot and the two wings, and orange strikes remove C from the cells that see both wings.