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depth: Limit white 6th move thinking depth to less than 3 

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Limit white 6th move thinking depth to less than 8
From test result we can known that 3/5/7/8 is OK.

But if set to 8, for this game:

 1.     f4    d2
 2.     b4    d6
 3.     d7    e4
 4.     d3    g4
 5.     a4    c4

White will place at a7 which will lost in 45.
If change to 3/5/7, sometimes place at d5(D), sometimes place at d1(49).

So it's better than 8. Not perfect.

We choose 7.

Now, For this game:

 1.     b4    d2
 2.     f4    d6
 3.     d1    d5
 4.     d7    c4
 5.     g4    e4

5 and 7 is bad move.

Only choose 3, White place at a4/d3 (D).
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Calcitem 2021-09-21 13:41:44 +08:00
parent 87e7314533
commit 0e8ab57b18
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src/mills.cpp
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@ -476,7 +476,7 @@ Depth get_search_depth(const Position *pos)
const Depth placingDepthTable9[25] = { const Depth placingDepthTable9[25] = {
+1, 1, +1, 1, /* 0 ~ 3 */ +1, 1, +1, 1, /* 0 ~ 3 */
+3, 3, +3, 15, /* 4 ~ 7 */ +3, 3, +3, 15, /* 4 ~ 7 */
+5, 2, +7, 0, /* 8 ~ 11 */ +5, 2, +3, 0, /* 8 ~ 11 */
+0, 0, +0, 0, /* 12 ~ 15 */ +0, 0, +0, 0, /* 12 ~ 15 */
+0, 0, +0, 0, /* 16 ~ 19 */ +0, 0, +0, 0, /* 16 ~ 19 */
+0, 0, +0, 0, /* 20 ~ 23 */ +0, 0, +0, 0, /* 20 ~ 23 */