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Analytical anomaly with SGF with fixed stone placement #889

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hope366 opened this issue Jul 19, 2021 · 1 comment
Closed

Analytical anomaly with SGF with fixed stone placement #889

hope366 opened this issue Jul 19, 2021 · 1 comment

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@hope366
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hope366 commented Jul 19, 2021

I will explain how to reproduce this bug.

  1. Register multiple engines in lizzie in advance.For example, katago-eigen, katago-eigenavx2, katago-opencl, leelazero, etc. You may register multiple items with exactly the same contents.
  2. Prepare an SGF with a fixed stone arrangement instead of a normal SGF. Please use the following SGF this time.
    (; AP [MultiGo: 4.2.4] SZ [19] MULTIGOGM [1]
    AB [dd] [qd] AW [dp] [pp])
  3. After starting lizzie, load the above SGF and analyze it. You should probably see a number around 50%.
  4. Then switch to another engine. At this time, a value exceeding 90% should be displayed. (It should be around 50% originally)

Also, this bug may or may not occur due to subtle changes in the placement of the stones. For example, the SGF below did not have this bug.
(; AP [MultiGo: 4.2.4] SZ [19] MULTIGOGM [1]
AB [dd] [pd] AW [dp] [pp])

This bug occurred in all three types of lizzie: lizzie0.7.3, Lizzie-patched-0.7.4_210704b, Lizzie-improved-v2.7.
The engines I used for verification are katago1.9.1eigen,katago1.9.1eigenavx2, katago1.9.1opencl, leelazero0.17. We were able to confirm this bug in all these engines.
We have only verified it in a Windows 10 environment.

@hebaeba
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hebaeba commented Jul 19, 2021

After launching Lizzie, this bug seems to occur when loading a SGF with fixed stone placement and then switching engines.
The same bug occurred when I first selected katago (GPU), loaded the SGF above, and then changed to katago-eigen.
Thus, it seems to be independent of the engine type.

kaorahi pushed a commit to kaorahi/lizzie that referenced this issue Jul 20, 2021
@hope366 hope366 closed this as completed Jul 24, 2021
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