03097: jsk: [possible] Game will not allow an apparently valid checkmating move

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
03097	Gameplay	Major	Always	Apr 7, 2009, 07:00	Apr 8, 2009, 19:50

Tester	nightsoil	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows XP/Vista 64-bit
Status [?]	Acknowledged			Driver	seta/ssv.cpp
Version	0.130	Fixed in Version		Build	Normal
		Fixed in Git Commit		Github Pull Request #

Summary	03097: jsk: [possible] Game will not allow an apparently valid checkmating move
Description	To understand the problem, you need to have some knowledge of shogi. Below you see a composite of two screenshots from jsk. I was trying to solve a shogi problem in one of the problem "books" in the game. The first screenshot is at the beginning of the problem. As you can see, it is a mate in five moves. (By the Japanese count, "five moves" means three moves by one player and two moves by the other.) The second screenshot is after this sequence of moves: 1) (Player) Silver (gin) to 2-2, promoting and giving check. 2) (Machine) Promoted Bishop (uma) takes the newly promoted Silver. 3) (Player) Gold (kin) to 1-3, giving Check. 4) (Machine) Promoted Bishop takes Gold at 1-3. It appears to me that after these moves, Promoted Rook (ryuu) to 2-1 would be mate. However, the game will not accept it.
Steps To Reproduce	Start the game and skip the tutorial. After the tutorial come some screens for selecting game options. On each of these (you will see three), select the right-hand option. To save you time, I give you here solutions to the first two problems. The odd-numbered moves are yours; the others are the computer's response: Problem #1: 1) Silver (gin) to 3-2 2) Silver to same 3) Bishop (kaku) to 2-1, promoting 4) Silver to same 5) Gold (kin) to 4-1 Problem #2: 1) Rook (hisha) to 3-3 2) Horse (uma) to same 3) Gold (kin) to 4-2 4) Horse to same 5) Gold to 2-2
Additional Information	In the problem, the game assumes "2-1 Bishop" is correct. Probably an original bug of the problem. Confirmation with PCB needed.
Github Commit

Flags	Possible
Regression Version
Affected Sets / Systems	jsk

Attached Files	whose-mistake.png (59,347 bytes) Apr 7, 2009, 07:00
Attached Files	0000.png (26,287 bytes) Apr 7, 2009, 21:27

No.04155 Fujix Administrator Apr 7, 2009, 21:29	It doesn't repro here for me. I followed your moves and the game accepted it as the correct answer as shown in the screenshot I uploaded.
No.04161 nightsoil Tester Apr 8, 2009, 04:29	No, you did "ni ichi uma". I tried "ni ichi ryuu". The bug is it won't take "ni ichi ryuu". (Or is it my mistake? I know I'm not a good shogi player, but I don't see any way out of this for Go-te.)
No.04163 Fujix Administrator Apr 8, 2009, 08:41	Yes, your move should be a correct answer. I think a problem with multiple answers is not legitimate, probably the game doesn't support it. Or, there may be a special rule that would affect this situation, though I don't know Shougi stuff very much. I'm not 100% sure but I guess this would be a bug of the original (problem).
No.04164 Haze Senior Tester Apr 8, 2009, 19:50	I think the only way to answer this one is for somebody to try it on the real machine, or for somebody to examine the game code. The Shogi game logic is controller by the additional CPU for this game.