Algorithm X (Exact Cover) · Web Worker · Reflection: ONsolving...
Board
Step 0 / 0+
Filled: 0 / 13 pieces
Pieces
Drag a piece onto the board to pre-place it. Click to remove.
F
I
L
P
N
Z
T
U
V
W
X
Y
O4
0 / 0+
Controls
Allow reflection
Speed
30 steps/s
Max solutions
1
Placement Stack
Ready
Depth: 0 / 13Solutions: 0
The solver runs in a Web Worker — the UI stays responsive while Algorithm X searches. Steps are streamed in batches of 5,000; playback can start before solving finishes.