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Sissa. Variant on 9 by 9 board with Sissa's. (9x9, Cells: 81) [All Comments] [Add Comment or Rating]

💡📝Carlos Cetina wrote on Tue, Oct 3, 2023 07:13 AM UTC:

I could not try anything out myself; if I follow the link to the preset page, it doesn't allow me to enter any move; if I click the highlighted destination square it just reverts to the (unhighlighted) original position. Probably because I am not one of the players.

Thanks for answering, HG. I was waiting for an answer from Fergus to your question. Apparently he didn't see it. What you are referring to is somewhat strange, since anyone who accesses the Sissa Chess preset must be able to reach the critical position in which the bug arises using the "MOVE pieces by yourself" resource, carrying out the following movements:

1. P e2-e4 P e7-e5
2. P d2-d4 P e5-d4
3. Q d1-d4 N b8-c6
4. Q d4-a4 P f7-f5
5. P e4-f5 P d7-d5
6. Q a4-i4 N h8-f7
7. S f1-d5 N c6-e7
8. Q i4-a4 S d8-c6
9. S d5-c5

Checking all the possible legal moves of the Blue side one by one, I found that the software rejects all but two: 9... B c8-d7 and 9... P b7-b5.

Curiously, both moves fall on the a4-e8 diagonal, with which the mystery of what causes the bug becomes more acute.

Does this give you any clues about what's going on?