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SMO 2023 Open Round 2 Question 2

SMO · SMO 2023 Open Round 2

Question 2

A grid of cells is tiled with dominoes such that every cell is covered by exactly one domino. A subset $S$ of dominoes is chosen. Is it true that at least one of the following $2$ statements is false?

(1) There are $2022$ more horizontal dominoes than vertical dominoes in $S$.

(2) The cells covered by the dominoes in $S$ can be tiled completely and exactly by the tetrominoes shown below (including rotations & reflections):

Question illustration