+1 +6111201200133303100134701200223502200441403301444602300
 106 
B@http://www.tanzzle.com/loyd_files/Loyd0.JPG
A@http://www.tanzzle.com/loyd.html
Sam Loyd's unsolved patterns 

The eighth book of Tan - 700 Tangrams by Sam Loyd
with an introduction and solutions by Peter Van Note
Dover publications Inc., New York 1968
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page 25 PARADOXICAL FALLACIES
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'The seventh and eighth figures represent the mysterious square, built with seven pieces: then with a corner clipped off, and still the same seven pieces employed.' 
This is a TRUE tangram, being different from the Loyd's figure in the (grey) central hole.
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'La settima e ottava figura rappresentano il misterioso quadrato, costruito con sette pezzi, e poi con un amgolo mancante, e sempre usando gli stessi sette pezzi'.
Questo è un VERO tangram, differente dalla figura di Loyd per il foro (grigio) centrale.