## Difficulty

## Description

This is a **Y-Wing**.

- The cell is called
**pivot cell**. - The cells are called
**wings**. Both*must*see the pivot cell.

**All three cells** (pivot + 2 wings) must **each** have **exactly two candidates**.

One of those candidates must be in both wings, but ** not** in the pivot cell. Here the

**common candidate**is the 3.

For this example, there are **two possible outcomes**:

Since there must be a **3** in one of those two cells, we know that all cells that see those two cells cannot hold a **3**.

The cells are seen by both wings, so we can **eliminate** the **common candidate** (**3**) from them.

## Another way to look at it

If any of the 3 were true...

... then that would leave only one candidate in each wing...

... and the pivot cell would have no candidates left, and therefore no solution.

## Spread over four boxes

In case the **pivot cell** is **not in the same box as a wing**, the Y-Wing spreads over four boxes.

In this case, there is only **one cell** that both wings see. ()