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  "body": "\n## Summary\n\nA domino tiling of a region made of unit squares is a covering of it by non-overlapping $1 \\times 2$ and $2 \\times 1$ rectangles.\nDomino tilings are the same as [[perfect matchings|0NHK9MFFW9]] of the grid graph of the cells.\nCounting them is a classical problem of combinatorics and statistical physics, solved for rectangles by Kasteleyn and by Temperley and Fisher in 1961.\n\n## Explanations\n\n### L1 human\n\nTake a chessboard and a box of dominoes, each covering exactly two neighbouring squares.\nA domino tiling places dominoes so that every square is covered exactly once.\nA $2 \\times 2$ board has two tilings: two horizontal dominoes or two vertical ones.\nThe ordinary $8 \\times 8$ chessboard has $12{,}988{,}816$ domino tilings.\n",
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