Hello. I only do puzzles right now. I've been stuck on a mate in 3 puzzle for a while, even after I've slept on it: lishogi.org/training/CsmoK
I don't want the answer. But if you see a mate in 3, please say that you do!
I just want to know that there's merit to continuing to spend time on it. Several times over, I've tried everything I see except for not giving a check on the first move, so I'm feeling a bit blind. (I've only been drawing arrows, not moving pieces. Otherwise, I'd already be done.)
Yes, yes there is. If you don't see it, either you haven't tried everything, or you've discarded the correct move without actually seeing that it works.
Yeah, found it pretty quick.
A mild hint below, if you want:
I'd recommend highlighting the king's "safe" squares. How can they be covered?
It's not even mate in 3, it's mate in 5 but the engine replies with an inferior defense that allows you to mate in 3.
Since the five-move sequence includes an unnecessary interposition, it counts as a three-move solution under Tsume Shogi rules. Furthermore, because the attacker would have pieces left over even without that interposition, a different three-move sequence is considered the correct answer. I am not sure if puzzles on lishogi should follow these specific rules, though...
@Illya @LizardWizard Understood, thank you. I spent some more time on it.
@ComPromise I see a guaranteed mate in 5 that's sometimes mate in 3 with a bad defense: 飛車 to 2三, 王将 northwest to 4二, 飛車 takes 金将 and promotes, drop block forced, take with 龍王 for checkmate. Maybe that's what you meant? ... Okay, I just gambled with it since I've already spent enough time thinking to deserve the hit if I get it wrong. It is a mate in 5 tagged as mate in 3. I reported it.
It's considered a mate in 3, since after rook takes gold the drop on 32 is futile.
See for example the explanation of futile interpositions here: note.com/tsume_springs/n/nb271ba70da2d
@Illya Thank you, that made the reasoning for the implicit claim that 5 == 3 more clear. And it helped me see what @Air427 was trying to explain.
At least I know what it's actually expecting of me now (I hope). I don't have to like it.
Sente to jam in 5.
1. R*23
2. K-42
3. Rx22+
4. R*32, B*32, G*32, S*32, N*32, L*32
5. Dx32
Jammed
K=King，玉
R=Rook，飛
D=+R=Dragon，龍
B=Bishop，角
G=Gold，金
S=Silver，銀
N=Knght，桂
L=Lance，香
Took me less than a minute but I got lucky. This is more or less what went through my head:
Identify where king can move.
There are 2 squares.
How can you cover those squares and the king's square at the same time with what you have?
Dropping rook on 4三 would do so, but knight would take, so lets try to deflect it.
The deflection square is 2三.
If we drop gold and king takes we don't have mate but if we drop rook and king takes we have mate because our pawn supports a gold drop on 2四 -> If we drop there it has to be rook first
At this point i played the move but i should have thought more
Gote can take the rook with any of the 3 pieces and we have mate on the next move
If king tries to run you take the gold with promotion and whatever Gote blocks with you capture with the dragon and its mate
You can't post in the forums yet. Play some games!