x x x x x x x x x x x x x x x x x x . . . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x x . . . x x x x x . x x x x x x x x x x
Solution - Sam Loyd, Cyclopedia of Puzzles, 1914 (a) the signal flag: p14, 340 (b) the Swiss flag: p14, 341 - M. Gardner, Mathematical Puzzles of Sam Loyd II, Problem 144
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . . . . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
Solution - Henry Ernest Dudeney, Puzzles and Curious Problems, Londom 1931, Problem 215 - The damaged rug p64-65, 159-160 - Harry Langman, Play Mathematics, 1962, Chap. 8: Geometric Dissections, problem 12 - Boris A. Kordemsky, The Moscow Puzzles, 1972, problem 160 - a cherihed reward - Martin Gardner, The Last Recreations, New York 1997, p262-264 (and checkered)
. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x x x x x x x x x x x . x x x x x x x x x x x x x x . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x .
Solution - CFF 27, Contest 10 (2 solutions) - Harry Langman, Play Mathematics, 1962, Chap. 8: Geometric Dissections, problem 13
x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x . x . . x . . x . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x x . . . x . . . x .
Solution - KBAHT (1995) p65 (Russian Math. Newspaper) one solution (the trivial) news swapping one piece, the other one does not. - Harry Lindgren, Recreational Problems in Geometric Dissections and How to Solve Them, Revised and enlarged by Greg Frederickson, Dover Publ. 1972 Fig. 1.18, 14.10 (a problem of Dudeney) - Henry Ernest Dudeney, Puzzles and Curious Problems, Londom 1931, Problem 195 - improvised chessboard p58, 154
x x x x x x x x x x . x x x x x x x x x x x x x x x x x x x x . x x x x x x x x x x x x x x x x x x x x . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x x x x x . x x x x x x x x . x x x x x x x x x x x x x x x x x x x x x x
Solution - Martin Gardner, New Mathematical Diversions from Scientific American, Simon and Schuster (1966), Sect 19.3: Two Pentomino Posers
x x x x x x x x x x x x x x x . x x x x x x x x x x x x x x x x x x x x x x x x x . . x x x x x x x x x x . . x x x x x x x x x x x x x x x x x x x x x x x x x . x x x x x x x x x x x x x x x
Solution - Sam Loyd, Cyclopedia of Puzzles, 1914
x x x x x x x x x x . . x x x x x x x x x x x x x x x x . . x x x x x x x x x x
Solution - Naralie van Eijk, Mausverbiss, Preisrätsel, Spektrum der Wissenschaft Jan. 2000, p102
. x x x x x . x x x x x . x x x x . x x x x x . x x x x x . . x x x x x x x x x x x x x x x x . . x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x .
Solution - Harry Langman, Play Mathematics, 1962, Chap. 8: Geometric Dissections, problems 7, 9, 10
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Last Update: 2000-01-10