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H. G. Muller wrote on Sun, Feb 18, 2024 12:12 PM UTC:

Ummm, I hacked in the king-capture test, but it doesn't seem to prevent the problem. And testing also showed a basic flaw of combining imperfect legality testing with king-capture termination: when you put the AI in check or mate through an undetected move, it would still think that capturing the King is illegal when it counter-checks you with a check that is detected.

This also confronted me with what you had already seen: it tries to keep me in perpetual check with the Demon. But it appears to think the Demon has jump-capturing ability. That it could check my King through the Kirin didn't strike me as strange, as it can capture the Kirin and burn teh King in the process. But when I evade that check with K-i2, it thinks the Demon can check me from d7, through a Pawn and Lion!

This is weird. For Tenjiku I hacked special code into cbGetAttackers to see the jump attacks: it scans the Queen rays from the given square (using the GG graph), and looks whether it encounters pieces that have a 'rank' in the jumpers[] array. This array is not supposed to specify a rank for the FD or +WB, though.


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