Can you prove that the five different tetrominos cannot cover exactly a 4x5 checker board?

The deer hair has two rows that are trimmed alternately to give a black and white checker board effect on the roach.

Fasson PET Void Check Matte Chrome is for tamper-evident labels, displaying an irreversible checker board effect when tampered with.

Others include a checker board made from woollen uniform fabric by a unknown private stationed in South Africa in 1878 at the time of the Zulu War, and an embroidered fabric crafted by a Private E.

DNA hybridization (checker board) was applied to the 16S rRNA of all isolates using 16S rRNA complementary probes: universal prokaryotic, enteric, betas, deltas, sulfate reducing bacteria, flavobacteria, gram positive low GC, and spirochete.

Hinson's Denim Checker Board collection includes four patterns--an alternating navy and light blue square design, an deeper navy all-over square design, a classic stone washed fabric and a pre-washed indigo colored denim.

She swept all of the checkers off the checker board.

The hall walls, in cream and burnt orange, are warm and welcoming but it is the side of the staircase, boarded in MDF and painted like a checker board, that takes your breath away.

They will rock all manner of shapes and shades, men in beautifully cut suits of exquisite fabric, mixed with the outrageously wild and zany styles of the younger generation, who sport all manner of colour with stripes, spots or even checker boards. It's an anything goes evening, a time for freedom of expression and to allow the inner person to be exposed.