X-Cross: Planning Cross Plus First F2L Pair Together

What Is an X-Cross?

An X-cross (extended cross) is a technique where you solve the four cross edges plus one complete F2L pair (a corner-edge pair inserted into its slot) during a single sequence of moves. Instead of building the cross and then separately solving the first F2L pair, both are accomplished together, often in fewer total moves than the two steps would require independently.

The "X" in X-cross refers to the shape left on the bottom face: the four cross edges plus one filled F2L slot create an X-like pattern when viewed from below. An X-cross typically saves 2-4 seconds: the moves saved (usually 3-5 fewer total) plus the elimination of the pause between cross and first pair.

When to Attempt an X-Cross

Not every scramble offers a good X-cross opportunity. Attempting a forced X-cross on an unfavorable scramble will cost more time than it saves. Look for these indicators during inspection:

• A corner-edge pair is already near the cross: If a matching corner and edge are both close to their target positions, incorporating them into the cross solution is often free or costs only 1-2 extra moves.
• The cross is short: If the cross can be solved in 4-5 moves, you have "budget" to spend 2-3 additional moves on the F2L pair within the 15-second inspection window.
• You can see the pair clearly during inspection: If the pair's corner and edge are visible without needing to rotate the cube during inspection, planning the X-cross is feasible.

How to Plan an X-Cross

X-cross planning extends your normal cross planning process:

1. Plan the cross normally: Identify all 4 cross edge positions and plan a solution.
2. Identify the easiest F2L pair: While planning the cross, note which F2L pair's corner and edge are in the most favorable positions.
3. Integrate the pair: Modify your cross solution to include the F2L pair. This might mean changing the edge insertion order, adding a setup move, or using a different cross solution that naturally brings the pair together.

Example

Suppose during inspection you see that the white-red and white-green edges can be placed with D R2 F2 D', and the red-blue corner-edge pair is already sitting in the U layer matched together. You notice that adding a U2 before the cross solution places the pair above its target slot, and the final D' of the cross drops everything into place. Your X-cross solution: U2 D R2 F2 D' R U R' — 7 moves for cross + one F2L pair, compared to approximately 10-12 moves if solved separately.

Difficulty Levels

• Free X-cross: The pair naturally falls into place during the cross solution with 0 extra moves. Rare but wonderful when it happens.
• Easy X-cross: 1-2 extra moves beyond the normal cross solution. Worth attempting in almost all cases.
• Medium X-cross: 3-4 extra moves, requiring careful planning. Attempt only if your inspection plan is solid.
• Forced X-cross: 5+ extra moves or requires tracking difficult piece movements. Generally not worth the planning complexity.

Practice Method

Generate scrambles and practice planning X-crosses without time pressure. Give yourself 30-60 seconds of inspection initially (ignoring the 15-second WCA limit) and focus on finding the F2L pair that integrates most naturally with the cross. Execute your planned X-cross and verify that both the cross and the F2L pair are correct.

As you improve, reduce inspection time toward 15 seconds. Track your success rate — aim for 80%+ accuracy before using X-crosses in timed solves. An incorrectly planned X-cross that requires fixing is far worse than a normal cross followed by a standard F2L pair.

X-Cross in Competition

Elite competitors don't attempt X-crosses on every solve — they assess each scramble and decide within the first 3-4 seconds of inspection whether an X-cross opportunity exists. If one does, they plan it. If not, they revert to standard cross planning. This selective approach maximizes the benefit without the risk of wasting inspection time on a futile X-cross attempt.