• Tile this board with 17 pieces and you can lose only one of F,G,H,I,J,K,M,Q,R,S,V,W,X,Z pieces.
• "X" piece must be located at one of 0,1,2,3,4,5 positions.

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• 紀錄解答：由下往上，由左往右，依XY座標的X4Y1,X5Y1,X3Y2,X4Y2,.......X8Y4,...X4Y8,X5Y8次序，記下單位小正方形內，該型片左下方第一個等腰直角三角形之編碼。
• 如果不用"X"型片，解答時要翻旋轉盤面，使紀錄之英文字母及數字排序最小，為其唯一解答。
• 這組解答還有三個全等圖形可以對換，變成少"F"型片、少"V"型片、少"R"型片。

  

• If you lose "X" piece , just flip or rotate the board and let the answering code be minimun in alphabetical order as an unique answering code .
• There are three pairs of congruent shapes , and you may lose "F" or "V" or "R" piece.

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• 少一片的14種Tetratans全部都有解答，你可以計算出：各有多少組解答嗎？

• Every one of the 14 Tetratans got solution , and what are the total solutions of each Tetratans ?
• 2000/12/10 post & 2000/12/14 updated

• Ｘ型片面積為２個單位正方形，再將Ｘ型片邊長各放大４倍的正方形盤面（故稱四倍盤 Quadruple）其面積為Ｘ型片的16倍，總面積為32個單位正方形，所以填滿盤面會剩下一塊４半方塊型片。這裡找到一個很有趣的解答，它橫跨 F、H、R、V、W、X六大類，更依據相關性質串成動畫檔 (GIF Animation) 呈現，以上則是詳細列表。 2007/10/25

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