Coloring arguments

Colour the board like a chessboard, or in stripes, so that every placed piece must cover a fixed mixture of colours. Counting the colours then shows immediately when a covering is impossible. The art is choosing the colouring.

Your progress

Not started

3Not started
0Familiar
0Proficient
0Mastered

Saved in this browser only. No account, nothing sent anywhere.

Work through it

LearnWhat it is, how to spot it, a worked example, and where it goes wrong.
Practice — 3-point ladderNo problems written at this tier yet.Nothing written at this tier yet
Practice — 4-point ladderNo problems written at this tier yet.Nothing written at this tier yet
Practice — 5-point ladder3 problems. Three in a row finishes it.0/3 in a row · 0/3 solved
Skill quizFinish every ladder that has problems first.Finish the ladders above first

Before and after

Needs first

GEO-02Grid coordinates and lattice reasoning LOG-05Parity arguments

Opens up

Nothing yet. No other skill in the Atlas lists this one as a prerequisite.

In official papers

No indexed official paper question has been tagged with LOG-07 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.

See the papers indexed so far

Loading…