Complex Arrangements — Prelims Strategy

Prelims Strategy

Read the clue set once to identify the dimensions, then build the smallest representation that keeps them distinct. A line suits ordered positions; a matrix suits one-to-one attributes; a circular anchor avoids counting rotated copies as new layouts when the question uses that convention. Mark fixed clues before tentative placements.

Preserve qualifiers exactly. Immediately means adjacency, somewhere means order without adjacency, and either may require checking whether the question intends an exclusive choice. Do not use personal left and right without the relevant facing direction. After placing a block, test its boundary positions and update exclusions in the other dimensions.

Before selecting an option, classify what is being asked: could be true, must be true, cannot be true or number of valid arrangements. A single successful layout answers only some of these. Test a must-claim by looking for a valid counterexample. In a count, remove invalid branches and duplicate representations deliberately. If work stalls, retain the verified constraints and revisit the question later; an unlabelled guess should not become a premise for subsequent answers.