關於數迴的「碰觸」 - 拼圖
By Yedda
at 2007-12-11T13:31
at 2007-12-11T13:31
Table of Contents
我在之前某篇的推文中,說「進入」只算是數迴的「登堂」。
現在介紹數迴的「入室」技巧:「碰觸」。
「進入」、「碰觸」的名詞都是我們自己想的,目前應還沒有公認的名詞。
A
→.
B
成斜線的兩個格子A、B。如果在A靠近B的兩個線段至少有一條有連接。
而「碰觸」到B的一個角。則稱A「碰觸」B。
A↑
→.→
↓B
A碰觸B後,可繼續往三個方向走,以上圖為例,往右或往下則「進入」了
B格。往上則沒有「進入」B格。
所以,當A「進入」B,則必A「碰觸」B。
反之則不必然,A「碰觸」B不見得A會「進入」B。
所以,解題的重點就在於當B被其他格碰觸之後,是否會從這裡進入?
Rule 1: 斜線的兩個格子A、B。若A「碰觸」B且B「碰觸」A,則
A「進入」B且B「進入」A。
Rule 2: 對標示為3的格子X,X「碰觸」四個對角上的其他格子。
Rule 1,2 結合,則若A「碰觸」標示為3的格子X,則A「進入」X。
Rule 2,2,1 結合,就是我們常用的斜線33的公式。
Rule 3:成斜線的A、X、B的三個格子,若X標示成2,且A「碰觸」X,則
X「碰觸」B。
這和進入的規則一樣,2具有遞延性。
由Rule1, 3可以推導出另一個公式:
成斜線的A、X、B的三個格子,若X標示成2,且A「碰觸」X、
B「碰觸」X,則A「進入」X且B「進入」X。
*
─‧ ─‧
2 => 2
‧─ ‧─
*
Rule 4:對標示為2的格子X,且X有一邊為不連接時,則X「碰觸」此不連接邊
對面的兩個對角格子。(下圖的AB)
A B
2
*
Rule 1,4 結合,是這個公式最常用的狀況,上圖若A「碰觸」X,則
A「進入」X。
A
2│
*↘
由Rule 2,4 的應用:
─
3 3│
2 ==> │2
* ↙*
由Rule 4,4 的應用:
* *↗
2 ==> 2│
2 │2
* ↙*
由於Rule3 所有的應用在斜線中插入多個2,依然成立。
--
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