View source for Mountain Trail

[[File:Mountain_Trail-01-sam.jpg|200px|thumb|right|'''Mountain Trail''' example, From: 23rd WPC Instrucion Booklet © 2014, UK Puzzle Association]]

'''Mountain Trail'''(待定中文名：山路小徑) 。

==Rules / 规则==
Draw a trail which starts and ends at the flag in the top left corner of the grid and visits every cell except for those occupied by a tree. The trail moves orthogonally between the centre of cells and does not touch or cross itself. The grid is divided into 3 regions by shading. Lighter shading represents the lower slopes of a mountain and darker shading represents the summit region of the mountain. The trail starts and finishes in the unshaded lowland region and makes a single ascent of the mountain and a single descent i.e. the trail has only 5 sections: lowland, lower slopes, summit region, lower slopes, lowland.
從表格左上角的旗幟開始, 畫一條環狀的路徑回到原點。這條路徑必須經過表格中除了樹以外的每個格子。而路徑本身只能直向或橫向連接, 且不能碰到或跨越自己。
表格本身以陰影深淺分成三個區域, 白色區域代表地勢最低的山腳下, 而最深色的區域則代表山頂。路徑必須從山腳一路往上走到山頂後再一路走回山腳, 所以整條路徑只會依序分成五個階段 - 山腳區, 斜坡區, 山頂區, 斜坡區, 山腳區。


==Solving techniques / 解题技巧==
*如同基本題型, 先把部分只有one way 的格子標出路徑。
*困難的點就是要從哪一格進入山坡, 再上山頂, 再從哪格下山坡, 再由哪格回到山腳。若是把格子間隔以奇偶做區分, 則若是第一格進入的是奇, 那麼最後一格出來的也一定是奇。接著再去找代表奇數的格子哪幾格可能出來, 最後就會減少可能性。當進出的格子都找到, 答案就很簡單了。

[[File:Mountain_Trail-01-sol.jpg|200px|thumb|right|'''Mountain Trail''' example, From: 23rd WPC Instrucion Booklet © 2014, UK Puzzle Association]]

==History / 历史==
*曾出現於第23屆WPC Round 2 第5題

==See also / 相关词条==
*[[Woodland Trail]]


==References / 参考资料==
*[http://www.uk2014.org/] 23rd WPC 官網

==External links / 拓展阅读==
*To be edited

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[[Category:Make_the_Loop]]