Se considera o tabla de $5x5$ patratele si $25$ de piese patrate, fiecare
piesa putand avea una din formele:

(1) !http://infoarena.ro/problema/drum?action=download&file=1.jpg!     (2) !http://infoarena.ro/problema/drum?action=download&file=2.jpg!    (3) !http://infoarena.ro/problema/drum?action=download&file=3.jpg!

(1) !problema/drum?1.jpg!     (2) !problema/drum?2.jpg!    (3) !problema/drum?3.jpg!

Se observa ca piesa (1) are conectate marginile N-S si E-V, piesa 2 are conectate marginile N-E si S-V, iar piesa 3 are conectate marginile N-V si S-E. Subliniem ca cele doua linii din piesa 1 NU se intersecteaza, ci trec "una pe sub cealalta".

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