Sanmill's bad moves

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White's moves were not aggressive each move but actually guaranteed a draw.

The aim of this experiment was to lure Sanmill into an attack and see if it would reveal any weaknesses.

Human Vs. AI

Draw

 1.     d2    b4
 2.     f6    f4
 3.     d7    d6
 4.     c5    g4
 5.     e4    c4
 6.     a4    d3
 7.     g1    d1
 8.     b6    d5
 9.     c3    b2
10.    d7-g7    d1-a1
11.    e4-e3    a1-d1
12.    e3-e4    d3-e3

 1.     e5    d2
 2.     a1    d6
 3.     b4    a4
 4.     d7    f4
 5.     b6    b2
 6.     f2    d1
 7.     d3    g4
 8.     e4    e3
 9.     g1    c4
10.    e5-d5    g4-g7
11.    e4-e5    g7-g4

 1.     d2    b4
 2.     c3    f4
 3.     d3    d1
 4.     e3xd1    d1
 5.     d7    d6
 6.     g4    c4
 7.     a4    f6
 8.     g7    b6xg7
 9.     e5    b2xa4
10.    e3-e4    b4-a4
11.    d3-e3xc4    a4-b4xd2
12.    e5-d5    b2-d2

[calcitem]

Human Vs. AI

AI lost:

 1.     d1    d6
 2.     c4    f4
 3.     g7    d7
 4.     d5    g4
 5.     e4    f6

So black's 5th move cannot search deeply.

After fixing, Black does move d2.

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I cannot reproduce!

 1.     d2    f4
 2.     d6    b4
 3.     e4    f6
 4.     f2    b2
 5.     b6    d5
 6.     d3  ( bad)

A small probability of occurrence, to be seen at the end.
It has never been possible to reproduce it.

[calcitem]

I cannot reproduce!

Even if it could be reproduced, it would be 87 moves before losing the game and could be ignored.

 1.     d6    d2
 2.     b4    f4
 3.     d3    f6
 4.     f2    d5
 5.     a4    c4
 6.     g4    e4

[calcitem]

 1.     d2    d6
 2.     f4    b4
 3.     d5    b6
 4.     f6    b2xf4
 5.     f4    f2
 6.     c4    d3
 7.     d1 （bad 37）

2 OK
3 OK choose
4 X
8 X
9 X
12 X
16 X
20 X

[calcitem]

Won't fix

 1.     d2    b4
 2.     d6    f4
 3.     e4    b6
 4.     b2    f2
 5.     f6    a4
 6.     c4    d1 (sometimes bad 37)
 
 1 (Mostly OK)
 2 (Half OK)
 3 (Half OK)
 4 (Most OK)
 5 (Half OK)
 6 (Half OK)
 7 (X)
 8 X
 20 (Mostly OK)

[calcitem]

Won't fix

 1.     f4    d2
 2.     d6    b4
 3.     c4    b6
 4.     b2    d5
 5.     e4    g4
 6.     a4    d3
 7.     d1    d7
 8.     f2    f6
 9.     a7   (sometimes bad 49)  

[calcitem]

 1.     d6    f4
 2.     b4    d2
 3.     d3    e4
 4.     g4    d5
 5.     a4    c4
 6.     f6    (bad 35)

正确走法是 A1、B2、B6、C3、C5、E3、E5、F2、G1、G7
如果深度为7，则固定走B6.

[calcitem]

 1.     f4    d2
 2.     b4    d6
 3.     d1    d5
 4.     d7    c4
 5.     g1    a1
 6.     g4    e4
 7.     g7xe4    e4
 8.     a7xe4    e4
 9.     d3    a4
10.    d3-c3    d5-e5
11.    c3-d3    e5-d5
12.    d3-e3    c4-c5
13.    f4-f2    e4-f4
14.    b4-c4    d5-e5
15.    e3-e4    c5-d5
16.    c4-c5    d2-b2
17.    d1-d2    a1-d1
18.    d2-d3    b2-b4 (bad move 39. Should a4-b4)

Move phase depth = 24 can fix.

[calcitem]

 1.     d6    b4
 2.     f4    d2
 3.     d3    b2
 4.     f2    b6xf4
 5.     f4    d5
 6.     f6xd2    d2
 7.     d1 (1/4 bad move 39)   

[calcitem]

1. b4    f4
   

2. d6    d2
   

3. b6    f6
   

4. b2xf6    f6
   

5. c5    f2xd6 (bad 39)
   

[calcitem]

 1.     b4    f4
 2.     d6    d2
 3.     b6    b2
 4.     f6xb2    b2
 5.     c5   

Black:
Bad:  f2xb4 （bad 39）
Good:  f2xc5/ or no mill


1 OK
2 X
3 OK
4 X
5 OK
6 X
7 OK
8 X
9 X
10 OK
11 OK
12 OK
13 X
14 X
15 OK
16 1/3 X
17 OK
18 OK
19 X
20 

[calcitem]

Black:
Bad move: f6
Good move: c5 / b4 / d3 / d2 / e3

 1.     d1    d6
 2.     c4    f4
 3.     g7    d7
 4.     d5    g4
 5.     e4

1 OK
3 OK
5 Half X
7 X
10 X
11 X
12 X
15 X
17 X
18 X

And also can fit

(Commit ff37bc3310ad42ef490ac0213768f46614eda733)

Black:
Bad move: d5
Good move: f2xd7

 1.     d6    f4
 2.     b4    d2
 3.     b6    f6
 4.     b2xf6    f6
 5.     d7

1 half X
2 OK
3 X

[calcitem]

Because

 1.     b4    f4
 2.     d6    d2
 3.     b6    

Generally, Black does not place to f6/b2 so that I won't fix it.

[calcitem]

White: 
Bad move: other 
Good move: c5

 1.     b4    f4
 2.     d2    d6
 3.     d7    d3
 4.     a4    c4

1 X
2 X
3 X 57 
4 X 47
5 X 43
6-8 X 47
9-10 X 27
11 X 47
12 X 27
13-14 X
15 X 33-47
16-17 X 57
18-19 X 47
20 X 57

Only test once!

无解，所以只能从白方第4步入手

第4步为15时，白方主动攻击，走在a4，降低为3时，白方走g4，

如果h黑方放在f6，

当第5步为3时，白方有概率放在D5(43), 
尝试改变深度
1 X
2 X
4 小概率 X
5 OK 固定 F2
6 OK b6 或 f2

说明只要第5步的深度 >= 5, 就一定不会有败着。

再看第4步设置成什么好，设置3时，白方走g4，不主动攻击
深度 1-2 也是如此
当为4时，b2 冒进，虽然还是D，但是感觉有些激进。

[calcitem]

#744 的例子：

 1.    f4    b4
 2.    d6    d2
 3.    d3    b2
 4.    a4    f6
 5.    c4

C4 lose in 63 steps

 1.    f4    b4
 2.    d6    d2
 3.    d3    b2
 4.    a4    f6

 1.    f4    b4
 2.    d6    d2
 3.    d3    b2
 4.    a4    f6
 5.    c4    d5
 6.    d1

d1 29 lost

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 1.    f4    b4
 2.    d6    d2
 3.    d3    b2
 4.    a4    f6
 5.    c4    d5

走 b6、f2 可以，其他待查

[calcitem]

 1.    d6    d2
 2.    f4    f6
 3.    b4    d5
 4.    d1    a4
 5.    g4    e4
 6.    g1 (bad)

[calcitem]

1.    d6    d2
 2.    f4    f6
 3.    b4    d7
 4.    d1    e4
 5.    a1    g1
 6.    a4  (bad)

[calcitem]

 1.    d6    d2
 2.    f4    b4
 3.    d1    g4
 4.    a4    f6
 5.    a1 （bad 47）

b2/c3/c4/c5/d3/d5/e3/e4/e5/g7 is OK

[calcitem]

1.    d6    d2
 2.    f4    b4
 3.    d1    c5
 4.    d7    d5
 5.    e5    c4
 6.    a4   （bad， shoud be c3）